Features

Dichroic Filters Function as Edgepass Filters with Minimal Absorption Losses
Four Sizes Available: Ø1/2", Ø1", Ø2", or 25 mm x 36 mm
Hard Coating Allows Easy Handling and Cleaning
Resistant to Damage from UV Light and Chemicals

Selection Guide
Cutoff Wavelength^a	Type	Item Prefix
425 nm	Longpass	DMLP425
505 nm	Longpass	DMLP505
567 nm	Longpass	DMLP567
605 nm	Longpass	DMLP605
638 nm	Longpass	DMLP638
805 nm	Shortpass	DMSP805
900 nm	Longpass	DMLP900
1000 nm	Shortpass	DMSP1000
1180 nm	Longpass	DMLP1180
1500 nm	Shortpass	DMSP1500
1800 nm	Longpass	DMLP1800

At the cutoff wavelength, the dichroic mirror functions as a 50:50 beamsplitter.

Click to Enlarge
Round Optics: Engraved Arrow Denotes Side with AR Coating

Click to Enlarge
Rectangular Optics: Engraved Face Has Dichroic Coating

A dichroic mirror/beamsplitter functions as a 50:50 beamsplitter at its design wavelength, known as the cutoff wavelength. A longpass dichroic mirror is highly reflective below the cutoff wavelength and highly transmissive above it, while a shortpass dichroic mirror is highly transmissive below the cutoff wavelength and highly reflective above it.

Thorlabs' Dichroic Mirrors/Beamsplitters are offered in eleven different cutoff wavelengths ranging from 425 - 1800 nm, and they provide >90% average transmission and >90% average reflection over their specified bands (see the graphs below). They are designed for use at a 45° angle of incidence and are available in sizes of Ø1/2", Ø1", Ø2", and 25 mm x 36 mm. Please refer to the table to the right to choose an appropriate filter for your application, and see below for representative transmission and reflection plots.

Dichroic filters feature a dichroic coating on one surface and an antireflection coating on the opposing surface. On round optics, an engraved arrow points toward the surface with the AR coating; on rectangular optics, the side with the engraving has the dichroic coating.

Applications
Dichroic mirrors/beamsplitters can be used to combine a beam that has a wavelength (or wavelength range) shorter than the design wavelength with a beam that has a wavelength (or wavelength range) longer than the design wavelength while minimizing intensity losses. Alternatively, spatially overlapping beams of different colors can be split with a single optic. This feature is commonly used in fluorescence microscopy to prevent light of the excitation wavelength from reaching the imaging detector. Please see the Applications tab for schematics of example experimental geometries.

Surface Quality and Durability
Thorlabs' Dichroic Mirrors/Beamsplitters consist of a hard, ion-beam-sputtered coating deposited on a UV fused silica substrate, providing excellent transparency deep into the UV, virtually zero autofluorescence, and a low coefficient of thermal expansion, making them an ideal choice for applications from the UV to the near IR. The uniformity of the coated glass prevents unwanted wavefront distortions and allows the optic to be cleaned and handled like typical glass. The coatings themselves have a 40-20 scratch-dig surface quality. They are virtually impervious to humidity effects and can withstand high optical irradiation intensities with no noticeable degradation or burns, even under prolonged exposure to ultraviolet light.

Mounting Option
For customers who wish to use these dichroic mirrors/beamsplitters in microscopy applications, Thorlabs manufactures a family of filter cubes and mounts. If a filter cube or mount is ordered at the same time as one of the dichroic mirrors sold on this page, Thorlabs will premount the optic at no additional charge. In order to take advantage of this option, please contact Technical Support prior to ordering.

General Specifications
Size	Ø1/2"	Ø1"	Ø2"	25.0 mm x 36.0 mm
Clear Aperture	>90% Diameter			>90% Surface Area
Thickness	3.2 mm	3.2 mm	5.0 mm	1.0 mm
Incident Angle	45°
Surface Quality	40-20 Scratch-Dig
Wavefront Distortion	<λ/4 @ 632 nm Over Clear Aperture
Substrate Material	UV Fused Silica
Operating Temperature	-50 to 80 °C

Wavelength Specifications
Item Prefix	Type	Cutoff Wavelength^a	Transmission Band^b	Reflection Band^c	AR Coating Range^d	Damage Threshold
DMLP425	Longpass	425 nm	440 - 700 nm	380 - 410 nm	400 - 700 nm	1.50 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm)
DMLP505	Longpass	505 nm	520 - 700 nm	380 - 490 nm	400 - 700 nm	1.50 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm)
DMLP567	Longpass	567 nm	584 - 700 nm	380 - 550 nm	400 - 700 nm	1.96 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm)
DMLP605	Longpass	605 nm	620 - 700 nm	470 - 590 nm	400 - 700 nm	1.50 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm)
DMLP638	Longpass	638 nm	655 - 700 nm	580 - 621 nm	400 - 700 nm	1.50 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm)
DMSP805	Shortpass	805 nm	400 - 790 nm	820 - 1300 nm	400 - 790 nm	1.00 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm) 7.30 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)
DMLP900	Longpass	900 nm	932 - 1300 nm	400 - 872 nm	932 - 1300 nm	1.21 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm) 6.78 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)
DMSP1000	Shortpass	1000 nm	520 - 985 nm	1020 - 1550 nm	520 - 985 nm	1.34 J/cm² (532 nm, 10 Hz, 10 ns, Ø250 µm) 9.74 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)
DMLP1180	Longpass	1180 nm	1260 - 1700 nm	750 - 1100 nm	1260 - 1700 nm	5.10 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)
DMSP1500	Shortpass	1500 nm	1000 - 1450 nm	1550 - 2000 nm	1000 - 1450 nm	7.30 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)
DMLP1800	Longpass	1800 nm	1850 - 2100 nm	1500 - 1750 nm	1500 - 2100 nm	5.10 J/cm² (1064 nm, 10 Hz, 12 ns, Ø250 µm)

The cutoff wavelength is the wavelength at which the reflected and transmitted intensity are both 50%.
The average transmission over the transmission band is greater than 90%.
The average reflection over the reflection band is greater than 90%.
>Over the AR coating range, R < 2% on the AR coated surface.

Typical Applications

Fluorescence Microscopy
Splitting or Combining Two Beams of Different Wavelengths
Filtering of Spectral Components
Laser Applications that Require Minimal Wavefront Distortion

Ray Diagram Illustration

Figure 1 depicts a dichroic mirror/beamsplitter being used to combine a transmitted beam (red) with a reflected beam (blue). The transmitted beam has a wavelength in the transmission band of the optic, and the reflected beam has a wavelength in the reflection band of the optic. If the direction of propagation is reversed, the optic becomes a beamsplitter, as shown in Figure 2.

In both cases, the combined, polychromatic beam is on the dichroic coated side of the dichroic filter. To minimize absorption losses in these optics, we recommend orienting them such that the wavelength being reflected does not pass through the substrate. Dichroic mirrors/beamsplitters differ from typical beamsplitters in that the beams can be combined or separated without a significant loss of intensity.

Figure 1. This figure depicts a dichroic mirror being used to combine two beams of different colors.

Figure 2. This figure depicts a dichroic mirror being used to split two beams of different colors.

Laser Induced Damage Threshold Tutorial

This tutorial is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.).

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 specifications. A standard 1-on-1 testing regime is performed to test the damage threshold.

LIDT metallic mirror

The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm² (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for a set duration of time (CW) or number of pulses (prf specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

Fluence	# of Tested Locations	Locations with Damage	Locations Without Damage
1.50 J/cm²	10	0	10
1.75 J/cm²	10	0	10
2.00 J/cm²	10	0	10
2.25 J/cm²	10	1	9
3.00 J/cm²	10	1	9
5.00 J/cm²	10	9	1

According to the test, the damage threshold of the mirror was 2.00 J/cm² (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that it is only representative of one coating run and that Thorlabs' specified damage thresholds account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. Additionally, when pulse lengths are between 1 ns and 1 µs, LIDT can occur either because of absorption or a dielectric breakdown (must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a large PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

Wavelength of your laser
Linear power density of your beam (total power divided by 1/e² spot size)
Beam diameter of your beam (1/e²)
Approximate intensity profile of your beam (e.g., Gaussian)

The power density of your beam should be calculated in terms of W/cm. The graph to the right shows why the linear power density provides the best metric for long pulse and CW sources. Under these conditions, linear power density scales independently of spot size; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other nonuniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the 1/e² beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm). While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the pulse lengths that our specified LIDT values are relevant for.

Pulses shorter than 10^-11 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10^-9 s and 10^-6 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration	t < 10^-11 s	10^-11 < t < 10^-9 s	10^-9 < t < 10^-6 s	t > 10^-6 s
Damage Mechanism	Avalanche Ionization	Dielectric Breakdown	Dielectric Breakdown or Thermal	Thermal
Relevant Damage Specification	N/A	Pulsed	Pulsed and CW	CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

Wavelength of your laser
Energy density of your beam (total energy divided by 1/e² area)
Pulse length of your laser
Pulse repetition frequency (prf) of your laser
Beam diameter of your laser (1/e² )
Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm². The graph to the right shows why the energy density provides the best metric for short pulse sources. Under these conditions, energy density scales independently of spot size, one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum power density that is twice that of the 1/e² beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm² at 1064 nm scales to 0.7 J/cm² at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm²) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10^-11 s and 10^-9 s. For pulses between 10^-9 s and 10^-6 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1997).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

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Posted Comments:

Poster: fabian.luecking

Posted Date: 2013-06-18 09:29:04.387

Hello, How do these filters perform when used at an AOI of zero? Is the behaviour comparable to that of other multilayer filters, i.e., do the entire transmission characteristics shift towards shorter wavelengths? Regards, Fabian

Poster:

Posted Date: 2013-05-20 13:44:34.08

Hi, Do you have reflection and transmission data for the DMLP1800 filter at wavelengths between 1100 and 1500 nm?

Poster: rakhoury

Posted Date: 2013-02-28 18:58:31.1

HI, I'm interested in the DMLP567 but I need to transmit above 1100nm and it's not clear from the plot provided. Can you send me an extended transmission plot or does this need to be custom made?

Poster: tcohen

Posted Date: 2013-03-06 14:50:00.0

Response from Tim at Thorlabs: Thank you for contacting us. One out of band scan (45deg %Tavg) we have taken on the DMLP567 showed ~57.4%T at 1100nm growing to ~89.7%T at 1200nm. We do not QC for this out of band wavelength and performance may vary from lot to lot. Perhaps a cold mirror such as the M254C45 may be appropriate for your application. I will contact you directly to discuss your T/R and wavelength requirements.

Poster: tcohen

Posted Date: 2013-01-17 15:13:00.0

Response from Tim at Thorlabs: Thank you for your inquiry. We will test a DMSP1000 out to 2000nm and I will contact you to keep you updated. As an alternative, typical DMSP1500 transmission is ~50% at 670nm and has >90%R at 2000nm.

Poster: jlow

Posted Date: 2013-01-15 19:24:00.0

Response from Jeremy at Thorlabs: We will e-mail you the extended transmission plot directly.

Poster: cm476

Posted Date: 2013-01-14 23:47:18.36

Hi, For the longpass dichroic DMLP567, could you send me an extended transmission plot please? It would be nice to be able to estimate the strength of spectral components in the 850-1000nm region. Best regards, Clemens

Poster: g9622513

Posted Date: 2013-01-14 10:05:04.22

We require a dichronic mirror with HT at 670 nm and R>80% at 2000 nm. Could you please tell us the reflectivity of DMSP1000 at 2000 nm?

Poster: jlow

Posted Date: 2012-09-28 09:24:00.0

Response from Jeremy at Thorlabs: The DMLP1800 will have around 57% reflectivity at 632.8nm. I will get in contact with you directly regarding the reflectivity graph for the DMLP1800.

Poster: lylee_heu

Posted Date: 2012-09-22 04:13:00.0

Hello,I need a Dichronic Mirror, with high Transmission (or reflection) at 1.9um band and Reflection (or transmission) at 632.8nm wavelength, to combine the both laser beams. The data for the DMLP1800 does not show the information at 632.8nm. Could I know this data at 632.8nm? Or can you make a dichronic mirror/beamsplitter to meet our requirement? Thanks very much for your assistance. Sincerly, L. Li

Poster: tcohen

Posted Date: 2012-08-15 10:02:00.0

Response from Tim at Thorlabs to Maria: Thank you for contacting us. The DMLP505 specifications include the 380-490nm reflection band and the 520-700nm transmission bands. Outside performance can vary more from lot to lot as this is not the primary focus during coating. That being said, we will send you some typical data and discuss your transmission requirements to find the best solution for you. For your interest, we also offer a service for sending a tested transmission data sheet for a specific part upon purchase. This will give you exact calibration for the part you receive and dispel any concerns about lot to lot variance.

Poster: mtibb075

Posted Date: 2012-08-09 15:54:47.0

Hello, I am looking for a Dichronic Mirror/beamsplitter that relfects under 505nm, but transmitts a 1092nm wavelength. The data for the DMLP505 does not show if it transmitts or reflects at the 1092nm wavelength. I was wondering if I could know this data, or if a dichronic mirror/beamsplitter can be made to do this. Thank you for your help in advance. Sincerly, Maria Tibbo

Poster: jlow

Posted Date: 2012-08-09 15:53:00.0

Response from Jeremy at Thorlabs: This would be a custom coating that we could possibly do. I will contact you directly to discuss this in more detail.

Poster: rcorrea

Posted Date: 2012-08-02 18:39:25.0

Hi there, Is it possible to get the DMSP1000L filter with the transmission/reflection regions switched? i.e. have the dichroic reflect below 1000 nm, and transmit for wavelengths greater than 1000 nm (at 45 degrees AOI). Thanks!

Poster: tcohen

Posted Date: 2012-06-21 11:53:00.0

Response from Tim at Thorlabs: Thank you for your feedback! We are currently looking into the possibility of extending our elliptical optics line and we are grateful for your time in sharing your interest with us! In the meantime, we may be able to offer this as a custom and I will contact you directly to discuss the required specifications of the coating and substrate and to discuss our coating schedule.

Poster: shaun.johnstone

Posted Date: 2012-06-20 00:47:30.0

The option of 2" elliptical dichroics would be extremely useful for my application. They could be mounted in KCB2E mounts and used to combine larger beams with the easy alignment of a cage system.

Poster: sharrell

Posted Date: 2012-04-18 08:59:00.0

Response from Sean at Thorlabs to yingk0917: Thank you for your feedback! It appears that you were viewing the data from www.thorlabschina.cn, and there was an error with the file stored on that site. We will work to get the link updated on our Chinese site, and I will email you the correct file directly. I apologize for the inconvenience.

Poster: yingk0917

Posted Date: 2012-04-17 22:35:51.0

Can you give me the specific reflectivity and transmissivity data of DML900. The data on the website is not useful. Thank you.

Poster: tcohen

Posted Date: 2012-04-05 11:36:00.0

Response from Tim at Thorlabs: Thank you for your feedback. Our closest stock match would be the DMLP567. I have contacted you with an extended curve for evaluation as well as information on a custom coating.

Poster: jaber

Posted Date: 2012-03-29 16:23:28.0

Need to separate blue and IR with thin dichroic mirror. Blue is 473 nm, IR is 785 nm but we need a range of 785nm up to a minimum of 930 nm (more range if we can get it) to pick up Raman peaks. Do we need a special coating? Prefer reflection of the blue, transmission of the IR, but can go the other way.

Poster: tcohen

Posted Date: 2012-03-28 15:43:00.0

Response from Tim at Thorlabs: Thank you for your feedback! Our closest stock match would be a shortpass, DMSP805, centered at 805nm. However, we may be able to offer a custom coating. I will contact you with more information.

Poster: valya

Posted Date: 2012-03-27 11:43:53.0

Hi! Can you recommend an image quality dichroic mirror for 45 aoi, transmission below ~700 nm, reflection above ~700 nm? Thanks!

Poster: tcohen

Posted Date: 2012-02-28 11:00:00.0

Response from Tim at Thorlabs: Thank you for your feedback on the DMLP1180. I have contacted you directly with the data out to 2100nm.

Poster: malo.de-kersauson

Posted Date: 2012-02-28 09:05:41.0

Hi, I need a 1500-2100 transmission window with a minimun 1100 cutoff wavelength. Do you have the specs for the DMLP1180 between 1800 and 2100 ?

Poster: jact

Posted Date: 2011-10-11 15:32:24.0

Like one of your other posters I would like to see the curves as regards s and p-pol reflection/transmission, in this instance for the DMLP505 and DMLP567 dichroics.

Poster: lmorgus

Posted Date: 2011-10-11 14:44:00.0

Response from Laurie at Thorlabs to jact: Thank you for your feedback. I've spoken with one of the engineers in our optics group, and they will use their spectrophotometer to determine the s and p transmissions for these filters. We will post that data to our website as soon as it becomes available.

Poster: jjurado

Posted Date: 2011-08-30 15:51:00.0

Response from Javier at Thorlabs to last poster: please contact us at techsupport@thorlabs.com so that we can provide this information for you.

Poster:

Posted Date: 2011-08-30 12:00:07.0

Hello, I need reflecting spectrum of 1180R filter in visible band (400nm to 750nm). Do you have an extended reflection Band plot in visible range ?

Poster: jjurado

Posted Date: 2011-06-27 15:18:00.0

Response from Javier at Thorlabs to sbouvier: Thank you very much for contacting us. The marking on the side of our dichroic beamsplitters indicates the dichroic side.

Poster: sbouvier

Posted Date: 2011-06-24 12:12:10.0

How to distinguish AR coating than Dichroic Filter Coating ? There is a black mark on one side, wich one ? Regards Customer Email: sbouvier@evosens.fr This customer would like to be contacted.

Poster: jjurado

Posted Date: 2011-05-13 17:39:00.0

Response from Javier at Thorlabs to volker.t.sonnenschein: Thank you very much for contacting us. The transmission of the DMLP567 dichroic mirror/beamsplitter decays very rapidly after 850nm, so it will most likely not be suitable for your application. I will send you an extended transmission plot shortly. I will also research some alternatives and let you know.

Poster: volker.t.sonnenschein

Posted Date: 2011-05-13 13:38:39.0

Is there Reflection/Transmission data available above 800nm for this Dichroic filter: DMLP567L We plan to use it as wavelength separator for the funamental/second harmonic of a Ti:sa laser (700-1000nm)

Poster: jjurado

Posted Date: 2011-04-04 10:47:00.0

Response from Javier at Thorlabs to seydi: Thank you very much for your feedback. At the moment, we do not have a dichroic mirror/beasmplitter that meets your specifications, and manufacturing one from scratch would not be cost effective at all. However, I will share your comments with our optics engineers and let you know if we decide to develop a solution that would be suitable for your application. I will contact you directly for further assistance.

Poster: seydi

Posted Date: 2011-04-02 03:09:27.0

Would it be possible to produce a short-pass rectangular dichroic filter at 900 or 950nm cutoff wavelenth and transmissive at all visible range? Actually DMSP1000R is also suitable for me but there will be problem when imaging blue fluorescence since its transmission is reducing below 520nm wavelength...

Poster: jjurado

Posted Date: 2011-03-29 14:47:00.0

Response from Javier at Thorlabs to al.dhalla: Thank you very much for submitting your request. I will discuss the possibility of developing a dichroic mirror/beamsplitter suitable for your application with our optics department. I will contact you shortly.

Poster: al.dhalla

Posted Date: 2011-03-29 11:24:12.0

Would it be possible to fabricate a dichroic with a 50/50 point at 950nm? I think this would be very useful for systems that employ broadband light in the 840nm and 1060nm ranges. The 900nm dichroic is a little too close to 840 for our application.

Poster: jjurado

Posted Date: 2011-03-29 10:03:00.0

Response from Javier at Thorlabs to gmp1g09: Thank you very much for submitting your request. We currently do not carry a long pass dichroic mirror/beamsplitter that meets your requirements. However, I will contact you directly to discuss other possible alternatives for your application.

Poster: gmp1g09

Posted Date: 2011-03-28 15:24:51.0

I was wondering if youve got a longpass dichroic mirror from about 900-1000nm to at least 1800nm ...

Poster: cek1

Posted Date: 2011-03-21 18:03:29.0

You have curves of wavelength versus average Reflection and Transmission at 45-degree angle-of-incidence. Do you have the data for the individual polarizations (often called s-polarization and p-polarization) as well?

Poster: jjurado

Posted Date: 2011-03-21 14:06:00.0

Response from Javier at Thorlabs to cek1: Thank you for contacting us with your request. You can access plots with transmission data in Excel format for each dichroic beamsplitter through the "Download Plot Data" link next to the transmission vs. wavelength graph. I will send you the data for the transmission of the s and p polarization components directly.

Poster: Greg

Posted Date: 2011-01-13 08:16:07.0

A response from Greg at Thorlabs to phamdt: Unfortunately we do not currently offer a dichroic mirror designed to reflect 248 nm. If you do not need a wavelength separation optic, the NB1-H03 may be suitable for you.

Poster: phamdt

Posted Date: 2010-12-21 13:25:42.0

I am a gradute student working on a laser-related project. I am looking for a dichroic mirror that will reflect wavelengths at 248 nm. Do you have a product that matches my needs?

Poster: tor

Posted Date: 2010-12-03 16:35:40.0

Response from Tor at Thorlabs to jnichols: Thank you for your request. Unfortunately, customized dichroic beamsplitters are often difficult to provide. I will contact you so we can explore cost-effective, alternate solutions.

Poster: jnichols

Posted Date: 2010-12-03 13:22:06.0

Do you have the capability to make dichroic beamsplitters for extended range regions, such as the 8-12 um LWIR band?

Poster: gilad-d1

Posted Date: 2010-10-11 17:46:23.0

is it possible to reverse the reflection/transmission order? I.e. to reflect the long Vis (425-700 nm) wavelength and transmit the short wavelength (350-425) in custom made dichroic filter?

Poster: Adam

Posted Date: 2010-05-14 08:19:58.0

A response from Adam at Thorlabs to Sheehy: We currently do not damage threshold information for these mirrors. We can send these out for testing but would like to contact you first. We would like to know the powers you are using and the wavelengths that would be of interest.

Poster: sheehy

Posted Date: 2010-05-13 15:05:16.0

it would be useful to know optical damage thresholds for these dichroic mirrors

Poster: klee

Posted Date: 2009-09-08 17:09:55.0

A response from Ken at Thorlabs to jorge: Thank you for your valuable feedback. Your suggestion has been forwarded to our optics division.

Poster: jorge

Posted Date: 2009-09-04 09:15:20.0

Dichroic beamsplitters, both 0 and 45 degrees, with 900nm cut-off wavelength would be very useful for those who work with diode lasers together with Nd:YAG lasers (reflection band of, for instance, 400-900nm, transmission band 900-1300nm, and viceversa). Thanks for your attention.

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