Unmounted Longpass Colored Glass Filters
- Ø25 mm Rounds, 2" x 2" Squares, or 6" x 6" Squares
- Economic Alternative to Thin-Film Interference Filters
- Selection Available in Kits
(2" x 2")
|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"|
(Length and Width of Square Filter)
|Wedge||<3 arcmin||<5 arcmin|
|Clear Aperture||80% of Diameter||80% of Length and Width|
|Material||Schott® Colored Glass|
- Longpass Cut-On Wavelengths from 280 to 1000 nm
- Ø25 mm Round, 2" x 2" Square, or 6" x 6" Square Sizes
- 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. The filters are available in both round and square varieties. The Ø25 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" filters, we recommend the FP02 Plate Holder. In addition to the longpass filters offered here, Thorlabs also offers a series of bandpass colored glass filters.
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.
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. 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|
|Mounted||Unmounted||AR Coated||Mounted||Unmounted||Mounted and Unmounted|
billmylife90  (posted 2019-02-13 20:43:26.577)
Is it pass all the IR wavelength band? Wanna know about the total band from 800 nm ~ 5000 nm ...
YLohia  (posted 2019-02-14 11:53:38.0)
Hello, thank you for contacting Thorlabs. The transmission of light > 2700nm falls below 50%. I will reach out to you directly with this data.
yoav  (posted 2018-02-07 13:54:17.49)
Hello. How many you have in-stock? Thanks
tfrisch  (posted 2018-02-09 03:49:08.0)
Hello, thank you for contacting Thorlabs. I will have a Sales Representative reach out to you with information on the availability of these filters. If you are looking for higher quantities, we should be able to accommodate those needs as well.
jasterb  (posted 2017-07-05 12:32:23.21)
Would it be possible to get the FGL570 in a 3mm thick 10mm diameter form or alternatively in a 3mm thick 6 inch square?
nbayconich  (posted 2017-07-11 11:12:38.0)
Thank you for contacting Thorlabs. I will contact you directly about our custom capabilities.
mbraithwaite  (posted 2017-02-21 15:50:40.613)
I've tested and proofed the FGL9 filter for my application. In the short term can you quote me qty=10 FGL9 filters edged down to 0.375" diameter? It's possible that I could need qty=1000 FGL9 filters with 0.375" diameter in 4Q17 and higher volumes later. I should know more about longer tern demand by June. Thanks Michael Braithwaite
tfrisch  (posted 2017-02-23 10:19:43.0)
Hello, thank you for contacting Thorlabs. Our Tech Support Team will reach out to you about this quote.
Carrie_Hsu  (posted 2016-02-19 12:58:02.013)
Hi, I'm Hsu from Taiwan. What's the operating temperature of FGL400S?
besembeson  (posted 2016-03-03 05:29:22.0)
Response from Bweh at Thorlabs USA: You could typically use this in the -50 to 80 deg C temperature environments.
jlow  (posted 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°.
l.costantini  (posted 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
tholste  (posted 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.
nateb  (posted 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.
tcohen  (posted 2012-07-17 13:49:00.0)
Response from Tim at Thorlabs: Thank you for contacting us! I will email you the spectral data.
mzlin  (posted 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!
tcohen  (posted 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.
cbrideau  (posted 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.
technicalmarketing  (posted 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
ghegenbart  (posted 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.
- Mountable with Filter Mounts or Lens Tubes
- Fabricated from 2 mm Thick Schott® Colored Glass
- Mountable with our Wide Selection of Filter Holders
- Fabricated from 2 mm Thick Schott® Colored Glass
(Click for Photo)
- 6" Square Filters Offer Large Surface Area for Large Beams
- Mountable to Breadboards and Ø1/2" Posts with the FP02 Plate Holder
- Fabricated from 3 mm Thick Schott® Colored Glass
Thorlabs offers two filter kits that bundle our most popular longpass and bandpass colored glass filters. The FGK01 Colored Glass Filter Kit contains three filters from our bandpass family and seven from our longpass family. The Ø25 mm filters are premounted in an SM1L03 lens tube that is engraved with the Item # and bandpass region (for bandpass filters) or cut-on wavelength (for longpass filters), and ship in a box with labeled slots to aid organization. The FGK01S Colored Glass Filter Kit contains the unmounted, square 2" x 2" counterparts to the filters in the FGK01.
If you purchase individual filters and would like a safe, convenient place to store them when not in use, consider our KT01 and KT03 Storage Boxes. The KT01 is designed to hold up to ten mounted Ø25 mm filters, while the KT03 can hold up to ten unmounted 2" x 2" filters.