- Corrects Dispersion Caused by Optical Elements
- Low AOI Allows Multiple Reflections Between Mirrors
- R > 99% for Either 650 - 1050 nm or 700 - 1000 nm
53.0 mm x 12.0 mm, Designed for Multiphoton Microscopy
Ø1", Compensates for
1.5 mm of Fused Silica
Ø1/2", Compensates for
1.5 mm of Fused Silica
Click to Enlarge
An example setup consisting of two UMC10-15FS chirped mirrors in POLARIS-C1G mirror mounts. These mirrors are designed with >99.5% reflectance and a low 10° AOI to support multiple reflections.
- Chirped Mirrors Designed for Dispersion Compensation:
- UMCx-15FS: Each Reflection Compensates for Group Delay (GD) of 1.5 mm of Fused Silica
- DCMP175: Large GD Compensates for Long Path Lengths in Multiphoton Microscopy
- High Reflectance and Low AOI Allow Multiple Reflections (See Drawing to the Right)
- Fused Silica Substrates
Thorlabs' Dispersion-Compensating Mirrors correct for the pulse broadening that occurs when ultrashort pulses propagate through an optical system. Ideal for use as dispersion management tools (e.g., precompensation), we offer them in two types: round mirrors that compensate for transmission through fused silica, the most common substrate for ultrafast optics; and rectangular mirrors designed for the long path lengths and optical substrates used in multiphoton microscopes.
Since a femtosecond laser pulse consists of many different wavelengths, pulse broadening (a lengthening of the temporal intensity profile) will occur when the pulse passes through a dielectric medium, like glass. This broadening is caused by the wavelength dependence of the refractive index of the optical components through which the light travels. In typical glass, shorter wavelengths have higher indices of refraction than longer wavelengths, causing shorter wavelengths to travel slower. These mirrors are specifically designed so that longer wavelengths experience larger group delay dispersion than shorter wavelengths, allowing the shorter wavelengths to "catch up" to the longer wavelengths.
The coatings on these mirrors are deposited onto the surface using ion beam sputtering (IBS). This highly repeatable and controllable technique results in durable thin film coatings with high damage thresholds.
For Thorlabs' full selection of optics for ultrafast applications, please see the Ultrafast Optics tab.
|Wavelength Range||650 - 1050 nm||700 - 1000 nm|
|Reflectance over Wavelength Rangea||Rabs > 99.5% over Wavelength Range||Ravg > 99% over Wavelength Range|
|Group Delay Dispersion (GDD) per Reflection||-54 fs2 at 800 nm||-175 fs2 at 800 nm|
|Size||Ø1/2"||Ø1"||53.0 mm x 12.0 mm
(2.09" x 0.47")
|Diameter Tolerance||+0.00 / -0.10 mm||N/A|
|Thickness||6.35 mm (0.25")||9.5 mm (0.37")||12.0 mm (2.09")|
|Thickness Tolerance||±0.10 mm||±0.20 mm||-|
|Clear Aperture||>80% of Diameter||At Least 8 mm x 50 mm|
|Angle of Incidence (AOI)||10°||8°|
|Surface Flatnessb||λ/4 at 632.8 nm Over Clear Aperture||λ/10 Over Any Ø8 mm in the Clear Aperture|
|Surface Quality||15-5 Scratch-Dig||10-5 Scratch-Dig|
|Laser-Induced Damage Threshold||0.07 J/cm2 (800 nm, 43.2 fs FWHM, S-Pol, 10 000 Pulses)c||0.10 J/cm2 (800 nm, 100 fs)|
The plots below give the theoretically calculated reflectance and group delay (GD) of these mirrors and represent the designed performance. The actual performance will vary from lot to lot within the specifications given in the Specs tab. The highlighted regions represent the specified wavelength range of the mirrors.
Click to Enlarge
The laser induced damage threshold (LIDT) value of an ultrafast optic is defined as the fluence (per pulse) that produces visible damage after a given number of pulses. These LIDT values were measured with 43.2 fs FWHM pulses at 800 nm that were s-polarized. LIDT values are not guaranteed in the ultrashort pulse regime. As such, they are provided as a service to customers.
Thorlabs offers a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Please see below for more information.
|Metallic Mirrors||Dielectric Mirror||High-Power Mirrors for
750 - 1000 nm
|Protected Silver Mirrors,
450 nm - 20 µm
|Unprotected Gold Mirrors,
800 nm - 20 µm
400 nm and 800 nm
|Ytterbium Laser Line Mirrors,
250 nm - 1080 nm
|Dispersion-Compensating Optics||Low-GDD Harmonic
Mirrors, 650 - 1050 nm
Prisms, 700 - 900 nm
400 nm and 800 nm or
500 nm and 1000 nm
|Beamsplitters & Windows,
600 - 1500 nm or
1000 - 2000 nm
- >99.5% Absolute Reflectance from 650 to 1050 nm
- Group Delay Dispersion (GDD) per Reflection: -1.5 mm of Fused Silica (-54 fs2 at 800 nm)
- Clear Aperture: >80% of Diameter
- 10° AOI
Thorlabs' UMC05-15FS and UMC10-15FS chirped mirrors feature >99.5% absolute reflectance over the 650 - 1050 nm wavelength range. The coating is engineered such that each reflection compensates for the dispersion introduced by 1.5 mm of fused silica over the entire range. The 10° AOI allows these mirrors to perform similarly for both s- and p-polarized light, and is ideal for a compact setup where multiple reflections are needed.
The Ø1/2” mirror is 6.35 mm thick, while the Ø1” mirror is 9.5 mm thick. These mirrors can be mounted by any mirror mount that accepts these optic thicknesses. To maximize the clear edge, we recommend mounting the UMC105-15FS in a POLARIS-C05G glue-in mirror mount, which features a 180° clear edge, and the UMC10-15FS in a POLARIS-C1G glue-in mirror mount, which features a 252° clear edge.
Click to Enlarge
- >99% Average Reflectance from 700 to 1000 nm
- Group Delay Dispersion (GDD) per Reflection: -175 fs2 at 800 nm
- Coated Surface Dimensions: 50 mm x 8 mm
- 8° AOI
- Designed for Pulses with Spectral Bandwidth >50 nm FWHM
- Sold in Packs of 2
The DCMP175 consists of a pair of rectangular optics with >99% average reflectance over the 700 - 1000 nm wavelength range. These mirrors are designed to integrate with multiphoton microscopy setups, which typically include long path lengths through highly dispersive glass. The 8° AOI allows these mirrors to perform similarly for both s- and p-polarized light, and is ideal for a compact setup where multiple reflections are needed.
As shown in the figure to the right, these mirrors can be mounted in the Kinematic Grating Mount Adapter, which is compatible with Ø1", front-loading, unthreaded mirror mounts, such as our Polaris Ultrastable Kinematic Mirror Mount.