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

FGL550S

(2" x 2")

FGL435

FGB67

(Ø25 mm)

FGL610

FGK01

Related Items


Please Wait
General Specifications
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"
Tolerance +0.0/-0.4 mm
(Diameter)		 +0.0/-0.4 mm
(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

Features

  • 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; please consider our fluorescence imaging filters if your application is sensitive to fluorescent signals. 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. 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 Color-Temperature-Balancing
Mounted Unmounted AR Coated Mounted Unmounted Unmounted

Posted Comments:
Jeonghan Lee  (posted 2024-08-01 14:37:45.323)
Can FGL570 be mounted in LMR1/M of your product?
jdelia  (posted 2024-08-01 11:15:41.0)
Thank you for contacting Thorlabs. Yes, you can mount the FGL750 in the LMR1/M and hold it in place using the SM1RR retaining ring that is included with the lens mount.
Manuel Lebrón  (posted 2024-03-14 11:43:23.777)
We've bought some of these filters at past. Would like to know the refractive index of it.
jdelia  (posted 2024-03-14 01:12:47.0)
Thank you for your inquiry regarding the FGL830 filter. This filter is made of Schott RG830 glass. This substrate at a 3 mm thickness has a refractive index of 1.560 at 587.6 nm, 1.550 at 852.1 nm, and 1.550 at 1.014 um.
Elyn Xie  (posted 2024-01-12 13:36:35.997)
Would it be possible to get the FGL455 or FGL435 in a 3-4mm thick 18mm diameter. Thank you
jdelia  (posted 2024-01-17 08:51:55.0)
Thank you for contacting Thorlabs. I have reached out to you directly to discuss the feasibility of this customized item request.
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.
Back to Top

Ø25 mm Unmounted Longpass Filters

Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL715b info 715 nm RG715
FGL9 info 721 nmc RG9
FGL780b info 780 nm RG780
FGL830b info 830 nm RG830
FGL850b info 850 nm RG850
FGL1000b info 1000 nm RG1000
  • Click on  for a plot and downloadable data.
  • These filters are also available in a mounted version.
  • This longpass filter has a transmission wavelength range of 721 nm - 1035 nm.
Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL550b info 550 nm OG550
FGL570b info 570 nm OG570
FGL590b info 590 nm OG590
FGL610b info 610 nm RG610
FGL630b info 630 nm RG630
FGL645b info 645 nm RG645
FGL665b info 665 nm RG665
FGL695b info 695 nm RG695
Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL280b info 280 nm N-WG280
FGL400b info 400 nm GG400
FGL420b info 420 nm GG420
FGL435b info 435 nm GG435
FGL455b info 455 nm GG455
FGL495b info 495 nm GG495
FGL515b info 515 nm OG515
FGL530b info 530 nm OG530
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FGL280 Support Documentation
FGL280Ø25 mm N-WG280 Colored Glass Filter, 280 nm Longpass
$43.91
3-5 Days
FGL400 Support Documentation
FGL400Ø25 mm GG400 Colored Glass Filter, 400 nm Longpass
$43.91
3-5 Days
FGL420 Support Documentation
FGL420Customer Inspired! Ø25 mm GG420 Colored Glass Filter, 420 nm Longpass
$31.06
3-5 Days
FGL435 Support Documentation
FGL435Ø25 mm GG435 Colored Glass Filter, 435 nm Longpass
$43.91
3-5 Days
FGL455 Support Documentation
FGL455Customer Inspired! Ø25 mm GG455 Colored Glass Filter, 455 nm Longpass
$31.06
3-5 Days
FGL495 Support Documentation
FGL495Ø25 mm GG495 Colored Glass Filter, 495 nm Longpass
$43.91
3-5 Days
FGL515 Support Documentation
FGL515Ø25 mm OG515 Colored Glass Filter, 515 nm Longpass
$43.91
3-5 Days
FGL530 Support Documentation
FGL530Customer Inspired! Ø25 mm OG530 Colored Glass Filter, 530 nm Longpass
$31.06
3-5 Days
FGL550 Support Documentation
FGL550Ø25 mm OG550 Colored Glass Filter, 550 nm Longpass
$43.91
3-5 Days
FGL570 Support Documentation
FGL570Customer Inspired! Ø25 mm OG570 Colored Glass Filter, 570 nm Longpass
$31.06
3-5 Days
FGL590 Support Documentation
FGL590Ø25 mm OG590 Colored Glass Filter, 590 nm Longpass
$43.91
3-5 Days
FGL610 Support Documentation
FGL610Ø25 mm RG610 Colored Glass Filter, 610 nm Longpass
$43.91
3-5 Days
FGL630 Support Documentation
FGL630Customer Inspired! Ø25 mm RG630 Colored Glass Filter, 630 nm Longpass
$31.06
3-5 Days
FGL645 Support Documentation
FGL645Customer Inspired! Ø25 mm RG645 Colored Glass Filter, 645 nm Longpass
$31.06
3-5 Days
FGL665 Support Documentation
FGL665Ø25 mm RG665 Colored Glass Filter, 665 nm Longpass
$43.91
3-5 Days
FGL695 Support Documentation
FGL695Customer Inspired! Ø25 mm RG695 Colored Glass Filter, 695 nm Longpass
$31.06
3-5 Days
FGL715 Support Documentation
FGL715Ø25 mm RG715 Colored Glass Filter, 715 nm Longpass
$50.34
3-5 Days
FGL9 Support Documentation
FGL9Customer Inspired! Ø25 mm RG9 Colored Glass Filter, 721 nm Longpass
$31.06
Lead Time
FGL780 Support Documentation
FGL780Ø25 mm RG780 Colored Glass Filter, 780 nm Longpass
$50.34
3-5 Days
FGL830 Support Documentation
FGL830Customer Inspired! Ø25 mm RG830 Colored Glass Filter, 830 nm Longpass
$31.06
3-5 Days
FGL850 Support Documentation
FGL850Ø25 mm RG850 Colored Glass Filter, 850 nm Longpass
$62.12
3-5 Days
FGL1000 Support Documentation
FGL1000Ø25 mm RG1000 Colored Glass Filter, 1000 nm Longpass
$43.91
3-5 Days
Back to Top

2" Square Unmounted Longpass Filters

  • Mountable with our Wide Selection of Filter Holders
  • Fabricated from 2 mm Thick Schott® Colored Glass
Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL715S info 715 nm RG715
FGL780S info 780 nm RG780
FGL830S info 830 nm RG830
FGL850S info 850 nm RG850
FGL1000S info 1000 nm RG1000
  • Click on  for a plot and downloadable data.
Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL550S info 550 nm OG550
FGL570S info 570 nm OG570
FGL590S info 590 nm OG590
FGL610S info 610 nm RG610
FGL630S info 630 nm RG630
FGL645S info 645 nm RG645
FGL665S info 665 nm RG665
FGL695S info 695 nm RG695
Item #
(Click for
Photo)		 Transmission Dataa Cut-On
Wavelength		 Schott®
Glass #
FGL280S info 280 nm N-WG280
FGL400S info 400 nm GG400
FGL420S info 420 nm GG420
FGL435S info 435 nm GG435
FGL455S info 455 nm GG455
FGL495S info 495 nm GG495
FGL515S info 515 nm OG515
FGL530S info 530 nm OG530
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FGL280S Support Documentation
FGL280S2" Square N-WG280 Colored Glass Filter, 280 nm Longpass
$87.82
3-5 Days
FGL400S Support Documentation
FGL400S2" Square GG400 Colored Glass Filter, 400 nm Longpass
$87.82
3-5 Days
FGL420S Support Documentation
FGL420SCustomer Inspired! 2" Square GG420 Colored Glass Filter, 420 nm Longpass
$87.82
3-5 Days
FGL435S Support Documentation
FGL435S2" Square GG435 Colored Glass Filter, 435 nm Longpass
$87.82
3-5 Days
FGL455S Support Documentation
FGL455SCustomer Inspired! 2" Square GG455 Colored Glass Filter, 455 nm Longpass
$87.82
3-5 Days
FGL495S Support Documentation
FGL495S2" Square GG495 Colored Glass Filter, 495 nm Longpass
$87.82
3-5 Days
FGL515S Support Documentation
FGL515S2" Square OG515 Colored Glass Filter, 515 nm Longpass
$87.82
3-5 Days
FGL530S Support Documentation
FGL530SCustomer Inspired! 2" Square OG530 Colored Glass Filter, 530 nm Longpass
$87.82
3-5 Days
FGL550S Support Documentation
FGL550S2" Square OG550 Colored Glass Filter, 550 nm Longpass
$87.82
3-5 Days
FGL570S Support Documentation
FGL570SCustomer Inspired! 2" Square OG570 Colored Glass Filter, 570 nm Longpass
$87.82
3-5 Days
FGL590S Support Documentation
FGL590S2" Square OG590 Colored Glass Filter, 590 nm Longpass
$87.82
3-5 Days
FGL610S Support Documentation
FGL610S2" Square RG610 Colored Glass Filter, 610 nm Longpass
$87.82
3-5 Days
FGL630S Support Documentation
FGL630SCustomer Inspired! 2" Square RG630 Colored Glass Filter, 630 nm Longpass
$87.82
3-5 Days
FGL645S Support Documentation
FGL645SCustomer Inspired! 2" Square RG645 Colored Glass Filter, 645 nm Longpass
$87.82
3-5 Days
FGL665S Support Documentation
FGL665S2" Square RG665 Colored Glass Filter, 665 nm Longpass
$87.82
3-5 Days
FGL695S Support Documentation
FGL695SCustomer Inspired! 2" Square RG695 Colored Glass Filter, 695 nm Longpass
$87.82
3-5 Days
FGL715S Support Documentation
FGL715S2" Square RG715 Colored Glass Filter, 715 nm Longpass
$87.82
3-5 Days
FGL780S Support Documentation
FGL780S2" Square RG780 Colored Glass Filter, 780 nm Longpass
$87.82
3-5 Days
FGL830S Support Documentation
FGL830SCustomer Inspired! 2" Square RG830 Colored Glass Filter, 830 nm Longpass
$87.82
3-5 Days
FGL850S Support Documentation
FGL850S2" Square RG850 Colored Glass Filter, 850 nm Longpass
$91.04
3-5 Days
FGL1000S Support Documentation
FGL1000S2" Square RG1000 Colored Glass Filter, 1000 nm Longpass
$87.82
Lead Time
Back to Top

6" Square Unmounted Longpass Filters

Item #
(Click for Photo)		 Transmission
Data		 Cut-On
Wavelength		 Schott®
Glass #
FGL610H info 610 nm RG610
FGL780H info 780 nm RG780
FGL850H info 850 nm RG850
  • Click on  for a plot and downloadable data.
  • 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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FGL610H Support Documentation
FGL610H6" Square RG610 Colored Glass Filter, 610 nm Longpass
$398.41
3-5 Days
FGL780H Support Documentation
FGL780H6" Square RG780 Colored Glass Filter, 780 nm Longpass
$614.75
3-5 Days
FGL850H Support Documentation
FGL850H6" Square RG850 Colored Glass Filter, 850 nm Longpass
$614.75
3-5 Days
Back to Top

Colored Filter Kits

FGK01S
Click to Enlarge

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.

FGK01 Contents FGK01S Contents Bandpass Region
or Cut-On Wavelength		 Transmission Plot
FGS900M FGS900S 315 - 710 nm Plot
FGB37M FGB37S 335 - 610 nm Plot
FGUVM FGUVS 325 - 385 nm Plot
FGL400M FGL400S 400 nm Plot
FGL495M FGL495S 495 nm Plot
FGL550M FGL550S 550 nm Plot
FGL610M FGL610S 610 nm Plot
FGL715M FGL715S 715 nm Plot
FGL780M FGL780S 780 nm Plot
FGL850M FGL850S 850 nm Plot
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FGK01 Support Documentation
FGK01Ø25 mm Round Colored Glass Filter Kit, Mounted in SM1 Lens Tubes
$526.93
3-5 Days
FGK01S Support Documentation
FGK01SColored Glass Filter Kit, Unmounted, Set of 10
$783.97
3-5 Days
Back to Top

Filter Storage Boxes

KT01
Click to Enlarge

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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
KT01 Support Documentation
KT01Storage Box for Mounted Ø1" (25 mm) Round Optics (Max. Capacity: 10)
$105.13
3-5 Days
KT03 Support Documentation
KT03Storage Box for Unmounted 2" Square Optics (Max. Capacity: 10)
$98.90
3-5 Days
Additional Colored Glass Filters
  • Unmounted Bandpass Colored Glass Filters

  • Mounted Bandpass Colored Glass Filters

  • Bandpass Colored Glass Filters (AR Coated)

  • Unmounted Longpass Colored Glass Filters

  • Mounted Longpass Colored Glass Filters

  • Color-Balancing Filters

  • Colored Filter Kits