Features

Hot Mirrors for Reflecting IR and Transmitting Visible Light
Cold Mirrors for Transmitting IR and Reflecting Visible Light
Substrate: Soda-Lime Glass

Thorlabs Hot Mirrors are perfect for keeping unwanted heat from reaching sensitive areas of your setup. In applications where heat build up is a concern, a 0° incidence hot mirror provides a means of protection by blocking the IR.

Thorlabs Cold Mirrors work to transmit IR energy and reflect the visible light from your setup at 90°. These mirrors are perfect for applications where the IR energy can be dumped and the visible is reflected at 90°. These mirrors are excellent for projection applications and for use as low and high pass filters.

The KM100T and KM200T are ideal mounting solutions for this line of hot and cold mirrors and are compatible with both imperial and metric posts.

Hot and Cold Mirror Specifications

Item #	FM01, FM201	FM02	FM04, FM204	FM03, FM203
Mirror	Wide Band Hot Mirror	Red Reflector	UV Cold Mirror	Cold Mirror
Angle of Incidence	0°	45°	45°	45°
50% Cut-Off	720 ± 25 nm	580 ± 15 nm	-	-
Transmission	>85% Avg from 450 to 645 nm	>85% Avg from 400 to 550 nm	>85% Avg from 600 to 1200 nm	>85% Avg from 750 to 1200 nm
Reflection	>90% Avg from 750 to 1200 nm	>90% Avg from 610 to 725 nm	>90% Avg from 325 to 475 nm	>90% Avg from 420 to 630 nm

Beam Path Illustration

Click to Download Transmission Data	Click to Download Transmission Data
Click to Download Transmission Data	Click to Download Transmission Data

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Posted Comments:
Poster: Thorlabs	Posted Date: 2010-07-01 17:44:46.0
Response from Javier at Thorlabs to revans: I have contacted our optics department for generating a transmission scan up to 7 um. In the meantime, I will send you a scan which covers up to 2 um. Regarding the radiant flux, we do not have damage threshold information for this mirror (in radiometric nor photometric terms. We are currently testing many of our optics components, but this hot mirror has not been tested, yet. I will bring this to the attention of our optics department. I will contact you directly in case you are interested in testing this mirror.

Poster: revans	Posted Date: 2010-07-01 14:23:14.0
Can you send me the transmission for longer wavelengths? up to 7µm would be ideal. Also what is the maximum radiant flux that this optic can handel; thinking about its use in concentrated solar devices. Cheers

Poster: Adam	Posted Date: 2010-05-20 17:17:49.0
A response from Adam at Thorlabs: We will work on updating the website. In the meantime, if you would like log plots we can supply them. Since no contact information was given, please send an email to techsupport@thorlabs.com with your request.

Poster:	Posted Date: 2010-05-18 19:52:45.0
It would really help to have the transmission plots on log scale. In linear scale, it is difficult to see the transmission value, other than nearly zero. For those of us who are interested, the transmission in long wavelength range is missing.

Poster: apalmentieri	Posted Date: 2010-03-16 12:43:51.0
A response from Adam at Thorlabs: The material of the glass is Soda lime glass. We have updated the website with this information.

Poster:	Posted Date: 2010-03-16 12:09:27.0
What material is the glass of these mirrors? BK7? UVFS? Thanks!