Longpass Filter Selection
Ø25 mm	2" x 2"	6" x 6"	Longpass Region
FGL280^a	FGL280S		280 - 1800 nm
FGL400^a	FGL400S		400 - 1800 nm
FGL420			420 - 2500 nm
FGL435^a	FGL435S		435 - 1800 nm
FGL455			460 - 2500 nm
FGL495^a	FGL495S		495 - 1800 nm
FGL515^a	FGL515S		515 - 1800 nm
FGL530			540 - 2500 nm
FGL550^a	FGL550S		550 - 1800 nm
FGL570			570 - 2500 nm
FGL590^a	FGL590S		590 - 1800 nm
FGL610^a	FGL610S	FGL610H	610 - 1800 nm
FGL630			630 - 2500 nm
FGL645			650 - 2500 nm
FGL665^a	FGL665S		665 - 1800 nm
FGL695			700 - 2500 nm
FGL715^a	FGL715S		715 - 1800 nm
FGL9			721 - 1035 nm
FGL780^a	FGL780S	FGL780H	780 - 1800 nm
FGL830			830 - 2500 nm
FGL850^a	FGL850S	FGL850H	850 - 1800 nm
FGL1000^a	FGL1000S		1000 - 1800 nm

These filters are also available in a mounted version.

Features

Longpass Region Cut-On Options Available from 280 to 1000 nm
Ø25 mm Rounds, 2" x 2" Squares, or 6" x 6" Squares
Kits Include Selected Longpass and Bandpass Filters

These longpass colored glass filters are manufactured from different colors of Schott glass and are intended for use in a wide variety of applications. In addition to the longpass filters offered here, Thorlabs also offers a series of bandpass colored glass filters. In either case, the filters are available in both round and square varieties. The 25 mm round filters will fit into our manual or motorized filter wheels; alternatively, they can be mounted in a lens tube. A selection of Ø25 mm filters is available premounted. To mount the 2" x 2" square filters, choose from our selection of fixed filter holders. For the 6" x 6" filter, we recommend the FP02 Plate Holder.

Several of the colored glasses used for our filters are fluorescent at certain wavelengths; for more details on how this may affect certain applications, contact Technical Support. For narrowband sources, we recommend our dielectric edgepass filters.

Colored Glass Filter Kits
Thorlabs also offers two filter kits containing our most popular bandpass and longpass filters. For specific product details, please see the bottom of the page.

Storage Boxes
If you purchase individual filters and would like to have a safe, convenient way to store them when not in use, consider our storage boxes. These are the same storage boxes that our kit filters arrive in. There is one box (KT01) designed for mounted Ø25 mm filters and a second (KT03) for the unmounted 2" x 2" filters.

Colored Glass Selection Guide
Bandpass			Longpass
Mounted	Unmounted	AR Coated	Mounted	Unmounted

General Specifications
Material	Schott Colored Glass
Size	Ø25 mm	2" x 2"	6" x 6"
Thickness	2 mm		3 mm
Surface Quality	40-20 Scratch-Dig
Surface Flatness	<λ @ 632.8 nm	<λ @ 632.8 nm over 1"	<λ @ 632.8 nm over 1"
Tolerance	+0.0/-0.4 mm (Diameter)	+0.0/-0.4 mm (Length and Width of Square Filter)
Wedge	<3 arcmin		<5 arcmin
Damage Threshold	30 W/cm² (Typ.)
Clear Aperture	80% of Diameter	80% of Length and Width

Item # (Ø25 mm)	Item # (2" Square)	Item # (6" Square)	Schott Glass	Description
FGL280^a	FGL280S		N-WG280	280 nm Longpass
FGL400^a	FGL400S		GG400	400 nm Longpass
FGL420			GG420	420 nm Longpass
FGL435^a	FGL435S		GG435	435 nm Longpass
FGL455			GG455	460 nm Longpass
FGL495^a	FGL495S		GG495	495 nm Longpass
FGL515^a	FGL515S		OG515	515 nm Longpass
FGL530			OG530	540 nm Longpass
FGL550^a	FGL550S		OG550	550 nm Longpass
FGL570			OG570	570 nm Longpass
FGL590^a	FGL590S		OG590	590 nm Longpass
FGL610^a	FGL610S	FGL610H	RG610	610 nm Longpass
FGL630			RG630	630 nm Longpass
FGL645			RG645	650 nm Longpass
FGL665^a	FGL665S		RG665	665 nm Longpass
FGL695			RG695	700 nm Longpass
FGL715^a	FGL715S		RG715	715 nm Longpass
FGL9			RG9	721 nm Longpass
FGL780^a	FGL780S	FGL780H	RG780	780 nm Longpass
FGL830			RG830	830 nm Longpass
FGL850^a	FGL850S	FGL850H	RG850	850 nm Longpass
FGL1000^a	FGL1000S		RG1000	1000 nm Longpass

These filters are also available in a mounted version.

Below are transmission plots (including surface reflections) as a function of wavelength for each of the colored glass filters presented on this page. Data was obtained for normal incidence. In each case, the shaded region indicates the range for which the transmission was >50% of the maximum transmission for that particular filter. To enlarge the plot, simply click on the plot. Thorlabs also offers bandpass colored filters.

Click on Graphs to Enlarge:

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Posted Comments:

Poster: jlow

Posted Date: 2013-01-21 16:15:00.0

Response from Jeremy at Thorlabs: The long pass and bandpass filters can be used with Xenon lamp. The specs might differ slightly since the angle of incidence is not 0°.

Poster: l.costantini

Posted Date: 2013-01-11 16:23:22.247

Hi, I'm Luca Costantini from Strategie s.r.l. and i should to know if the filter long pass and bandpass operates with xenon lamp

Poster: tholste

Posted Date: 2012-07-27 17:49:00.0

A response from Tor at Thorlabs to nateb: Thank you very much for contacting us. We also observe fluorescence at 532 nm for this filter - we will update this page with respect to these findings. In the meantime, I will be contacting you to discuss your application.

Poster: nateb

Posted Date: 2012-07-23 11:30:48.0

Using information from the Schott website and the information contained on the Thorlabs website I chose the FGL590 longpass filter. Unfortunately, I found that the filter fluoresced strongly under 532 nm light. Using a 15-50 mW 532 DPSS laser I illuminated the backside of the filter and found that there is a visible orange glow emitting from the filter. I would expect an OD5 blocking at this wavelength (532 nm). This fluorescence effect should be listed.

Poster: tcohen

Posted Date: 2012-07-17 13:49:00.0

Response from Tim at Thorlabs: Thank you for contacting us! I will email you the spectral data.

Poster: mzlin

Posted Date: 2012-07-16 19:36:05.0

How do these compare to your edgepass filters in slope steepness? I had a difficult time figuring this out with only the graphs showing divisions 100 or 200 nm apart. Would it be possible to email me the spectra of the 715 and 721 longpass colored filters please? Thank you!

Poster: tcohen

Posted Date: 2012-06-28 14:44:00.0

Response from Tim at Thorlabs: Thank you for your feedback! We have introduced the new FGL570 filters with 25mm OD because of the popularity of the size. We also have a larger version of the CFH1, the CFH2, for 1” diameter filters. If you are interested in ½” filters to retrofit into your system, we should be able to quote this as a custom for you and I have contacted you to discuss this option.

Poster: cbrideau

Posted Date: 2012-06-27 18:52:41.0

Any chance of getting these in 1/2" round instead of 1"? I'm using the little 1/2" filter holders (CFH1) and I'd like to use these colored glass filters with them.

Poster: technicalmarketing

Posted Date: 2008-02-14 17:25:57.0

We have double checked and the graphs shown in V19 are incorrect. Please refer to the web for the most up-to-date graphs

Poster: ghegenbart

Posted Date: 2007-11-20 04:38:25.0

The graph for the BG40 glass in the "Graph" tab is different from the graph shown on the pdf copy of the catalog page in the "Drawings&Documents" tab.

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