Products Home / Optical Elements / Optical Filters / Colored Glass Filters / Unmounted Bandpass Colored Glass FiltersUnmounted Bandpass 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
FGB37S
(2" x 2")
FGUV5
FGB25
FGK01
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
- Bandpass Regions Between 240 and 1375 nm
- Ø25 mm Round, 2" x 2" Square, or 6" x 6" Square Sizes
- Kits Include Selection of Bandpass and Longpass Filters
These bandpass 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 bandpass filters offered here, Thorlabs offers a series of longpass colored glass filters. If transmission ratios greater than those provided by the filters listed here are required, we provide a selection of bandpass colored glass filters with antireflective coatings.
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 bandpass 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.
| Posted Comments: | |
Alexander Jelzow
(posted 2024-11-08 09:26:48.923) Dear Thorlabs team,
do you offer Hoya CM500 as an alternative to Schott BG39?
Best regards,
Alexander Jelzow EGies
(posted 2024-11-08 04:12:57.0) Thank you for contacting Thorlabs. I have contacted you directly regarding this custom request. Colin Black
(posted 2024-04-19 10:44:04.88) Hi there, I am interested in the laser damage threshold of the FGS900 filter?( or KG3 glass in general)
We will be using the filter with a pulsed 1064 nm laser with a pulse energy of 0.92 mJ and a pulse duration of 16 ns. The beam diameter will be roughly 4 mm at the filter
Look forward to hearing from you cdolbashian
(posted 2024-04-26 02:10:36.0) Thank you for reaching out to us with this inquiry. Unfortunately, we do not have damage threshold data for these Schott-glass substrates. I have reached out to you directly to evaluate compatibility. Anton Bykov
(posted 2024-03-04 15:17:21.81) The spectrum of FGB39 and FGB37 filters differs substantially from Schott reference spectra for the BG39 and BG40 filters. In fact, FGB37 most closely resembles BG60-61 filters from Schott catalogue.
This does not seem to be a degradation issue, as measured spectra reproduce the Thorlabs reference well, but not the Schott reference.
Is there an explanation to that? cdolbashian
(posted 2024-05-06 09:22:22.0) Thank you for reaching out to us with this inquiry. The discrepancy comes down to the fact that Schott presents their transmittance graph with a log scale, while we use a linear scale. I was able to plot, and share with you, both of these graphs on the same scale and they looked identical. S. Mohammad-Reza Taheri
(posted 2020-08-19 09:06:33.18) Is there any information about the damage threshold for the FGS900 filter? YLohia
(posted 2020-09-24 04:04:24.0) Thank you for contacting Thorlabs. What beam parameter specs do you intend to use this filter with (Wavelength, CW or Pulsed, Average Power, Peak Power (if pulsed), Pulse width (if pulsed), Rep rate (if pulsed), Beam diameter)? I had requested this information from you via email at the time of your post. If you're still interested in this information, please email us at techsupport@thorlabs.com. CARLOS MONTES
(posted 2020-02-06 22:26:33.123) Do you have adapters in order to mount this filter in a astrophotography camera which uses 1,25 inch filters? YLohia
(posted 2020-02-07 11:41:04.0) Thank you for contacting Thorlabs. As of now, we do not offer such an adapter. I have reached out to you directly to discuss alternatives. andrea.capozzi
(posted 2016-10-05 07:58:50.033) Dear ThorLab,
I would like to perform some UV light illumination experiments. I have a broad-band source (300-450 nm) with an illumination circular spot of 7 mm of diameter.
In order to fit the filter in my setup it has to be a circle of 7 mm diameter as well.
Would it be possible to cut/mill/grind the 25 mm filters you sell (how resistent is the material)? In case I have to do it myself (and I wuld like to know how) or you can take care?
Best
Andrea Capozzi, PhD jlow
(posted 2016-10-05 02:04:55.0) Response from Jeremy at Thorlabs: We can edge the filter down to the size you need. I will contact you directly about the quote. mg9420
(posted 2016-08-02 13:05:23.407) Hello ,Thorlab
We are pleased to receive your letter
We need some filters that diameter is half inch.
Item Quantity
1.FGUV11-UV *2
2.FGL570 *2
3.NE02A-A *1
4.NENIR05B-C *1
We would like to make an inquiry.
My company from Taiwan,Bolite Co., Ltd. mg9420
(posted 2016-07-29 02:02:28.56) In our experiment we need some bandpass colored glass filters that diameter is half inch.
I want to customized it.
Can you customized it for me? beckham18274
(posted 2015-04-25 08:15:21.977) Hi:)
i have question!
what is bandwidth of FGUV5?
please tell me~~ jlow
(posted 2015-04-28 03:54:14.0) Response from Jeremy at Thorlabs: The transmission graph for each filter is located in the subgroup of each filter. There's also the raw data available for download. The shaded region, which denotes the spectral range for which the transmission is >50% of the maximum transmission, represents the range for which we recommend using this colored filter. giuseppe.vitucci
(posted 2015-01-15 04:02:14.807) May I ask you an excel sheet with the values of trasmittance vs wavelength of the item FGB67? jlow
(posted 2015-01-15 01:15:41.0) Response from Jeremy at Thorlabs: The raw data download link can be found right below the transmission graph for each filter. bdada
(posted 2011-11-15 18:29:00.0) Response from Buki at Thorlabs:
Thank you so much for participating in our Feedback Forum. You've provided us with some great product ideas that we intend to pursue. We can offer custom filters to meet your specifications and we will contact you directly to continue this discussion. clarafly
(posted 2011-11-10 17:35:53.0) Do you offer the filter with BG39 color glass? The extinction of BG39 at long wavelength is much better than BG40. Some of the color glasses, such as BG39 and BG40, are quite sensitive to humidity. Can you offer color glass filters with AR coatings on both sides? The coatings can protect the color glasses from humidity and reduce the reflection loss at both surfaces at the same time. Javier
(posted 2010-06-23 09:54:07.0) Response from Javier at Thorlabs to orevilla: The tolerance value of +0.0/-0.4 mm also applies to the thickness of the filter. orevilla
(posted 2010-06-23 06:50:27.0) In the specs sheet of the FGS900S bandpass filter the thikness is 2mm with a tolerance of +0.0/-0.4mm. Is this correct?
It is the same as the dimensional tolerance, but for the thikness is a 20% of variation (it seems to be very high).
Thank you in advance for your time. |
- Mountable with Filter Mounts or Lens Tubes
- Fabricated from 2 mm Thick Schott® Colored Glass
- Also Available in an SM1-Threaded Mount
- Mountable with our Wide Selection of Filter Holders
- Fabricated from 2 mm Thick Schott® Colored Glass
| Item # (Click for Photo) |
Transmission Dataa |
Bandpass Region | Schott® Glass # |
|---|---|---|---|
| FGS900H |  |
315 - 710 nm | KG3 |
| FGB37H | |
335 - 610 nm | BG40 |
- 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® Glass
Zoom
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 |  |
| FGB37M | FGB37S | 335 - 610 nm |  |
| FGUVM | FGUVS | 325 - 385 nm |  |
| FGL400M | FGL400S | 400 nm |  |
| FGL495M | FGL495S | 495 nm |  |
| FGL550M | FGL550S | 550 nm |  |
| FGL610M | FGL610S | 610 nm |  |
| FGL715M | FGL715S | 715 nm |  |
| FGL780M | FGL780S | 780 nm |  |
| FGL850M | FGL850S | 850 nm |  |
Zoom
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.
Unmounted Bandpass Colored Glass Filters
