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Products Home / Optical Elements / Optical Mirrors / Concave Mirrors / Concave Mirrors: Protected Gold (800 nm - 20 µm)Concave Mirrors: Protected Gold (800 nm - 20 µm)
- Protected Gold Coating
- Focal Lengths from 9.5 - 1000 mm
- Ø1/2", Ø1", Ø2", and Ø75 mm
- No Chromatic Aberration
CM750-056-M01
Ø75 mm
CM508-038-M01
Ø2"
CM254-019-M01
Ø1"
CM127-010-M01
Ø1/2"
Focus Polychromatic
Beams without
Chromatic Aberration
Please Wait
| Common Specifications | |
|---|---|
| Available Diameters | 1/2", 1", 2", and 75 mm |
| Metallic Coating Range | 800 nm - 20 µm; Ravg > 96% |
| Clear Aperture | >90% of Diameter |
| Surface Quality | 40-20 Scratch-Dig |
| Diameter Tolerance | +0.0/-0.2 mm |
| Substrate | N-BK7a |
| Backside Surface | Fine Ground and Engraved with Part Number (Not Polished) |
| Metallic-Coated Concave Mirrors | |
|---|---|
| UV-Enhanced Aluminum 250 - 450 nm |
Protected Aluminum 450 nm - 20 µm |
| Protected Silver 450 nm - 20 µm |
Protected Gold 800 nm - 20 µm |
See the Concave Mirror Guide tab, above, for our complete selection of concave mirrors.
Features
- Protected Gold: 800 nm - 20 µm
- Four Diameter Options: 1/2", 1", 2", or 75 mm
- Focal Lengths Range from 9.5 mm - 1000 mm
Thorlabs' Protected Gold-Coated Concave Mirrors are designed for light collection, imaging, and focusing applications. These reflective optics focus light without chromatic aberration, making them especially suitable for broadband sources.
These mirrors offer >96% average reflection in the infrared spectral range from 800 nm - 20 µm. They consist of a gold-coated N-BK7 substrate that features a protective SiO2 overcoat. With low surface irregularity at 633 nm, these mirrors provide excellent image quality.
All of the mirrors on this page can be mounted by our Precision Kinematic Mirror Mounts.
Please contact Tech Support for custom versions of these optics. Thorlabs also offers dielectric concave mirrors that provide higher reflectivity than metal mirrors at the expense of operating over a more narrow wavelength range.
The shaded regions in the graphs denote the ranges over which we guarantee the specified reflectance. Please note that the reflectance outside of these bands is typical and can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.
| Posted Comments: | |
user
(posted 2020-08-06 09:20:19.473) @YLohia: Thank you for the info. Do you have any experience where the damage threshold is in terms of temperature (talking about ambient air temperature, not laser-induced)? And what is the failure mechanism? Can you offer any mirrors which can withstand ~600 °C? YLohia
(posted 2020-08-10 12:20:50.0) Hello, the information given in the previous feedback response was relating to the maximum ambient temperature, not LIDT. I have reached out to you directly to discuss the possibility of offering a custom mirror. user
(posted 2020-08-04 11:02:14.36) How thick is the SiO2 overcoat and why do you use a different one (website says dielectric) on your plano Gold mirrors. Background of my question is the maximum operating/ambient temperature for these mirrors. YLohia
(posted 2020-08-05 09:45:57.0) Thank you for contacting Thorlabs. Unfortunately, the thickness of the SiO2 layer is proprietary information. We also use SiO2 on our plano protected gold mirrors. While we don't have a formal maximum temperature spec, since these mirrors are coated at 200-250 C, they should hold up to that temperature range. Phil Chapnik
(posted 2019-10-25 11:22:46.087) Asked for surface irregularity on concave mirrors. Information was on the site, I just missed it for some reason. Phil Chapnik
(posted 2019-10-25 11:09:42.977) How about publishing the surface figure error on the concave mirrors? It would be great if the info gave the figure error over the entire clear aperture in addition to over any diameter of, for example, 1 cm. |
| Concave Mirrors Coating Options | |
|---|---|
| Coating | Wavelength Range |
| UV Enhanced Aluminum | 250 - 450 nm |
| Aluminum | 450 nm - 20 µm |
| Silver | 450 nm - 20 µm |
| Gold | 800 nm - 20 µm |
| E01 Dielectric | 350 - 400 nm |
| E02 Dielectric | 400 - 750 nm |
| E03 Dielectric | 750 - 1100 nm |
| E04 Dielectric | 1280 - 1600 nm |
Concave Mirror Selection Guide
Thorlabs offers concave mirrors with both metallic and dielectric stack reflective coatings. Metallic-coated mirrors offer relatively high reflectivity (90-95%) over a wide wavelength range, while dielectric-coated mirrors provide even higher reflectivity (>99%) but over a smaller wavelength range. See the table to the right for an overview of the various coatings we offer for our concave mirrors. All coating options are available on optics with diameters ranging from Ø1/2" to Ø75 mm. Metallic mirrors are available with focal lengths from 9.5 - 1000 mm, while dielectric mirrors are available with focal lengths from 12 - 1000 mm.
Below are reflectivity plots for our complete line of concave mirrors. To view our selection of mirrors available with a particular coating, either click on the graphed line of interest or the corresponding coating name in the legend. Graphs are shown for an angle of incidence (AOI) of 8 degrees, which is the recommended angle at which to use a concave mirror.
Click on a particular graphed line or the corresponding name in the legend to view concave mirrors with that coating option.
| Item # | Focal Length | Center Thickness | Edge Thickness | Radius of Curvature | Surface Irregularity | Thickness Tolerance | Reference Drawing |
|---|---|---|---|---|---|---|---|
| CM127-010-M01 | 9.5 mm | 3.0 mm | 4.0 mm | 19.0 mm (0.75") | λ/4 @ 633 nm | ±0.2 mm |  |
| CM127-012-M01 | 12.0 mm | 3.8 mm | 24.0 mm (0.94") | ||||
| CM127-025-M01 | 25.0 mm | 3.4 mm | 50.0 mm (1.97") | ||||
| CM127-050-M01 | 50.0 mm | 3.2 mm | 100.0 mm (3.94") |
| Item # | Focal Length | Center Thickness | Edge Thickness | Radius of Curvature | Surface Irregularity | Thickness Tolerance | Reference Drawing |
|---|---|---|---|---|---|---|---|
| CM254-019-M01 | 19.0 mm | 6.0 mm | 8.1 mm | 38.0 mm (1.50") | λ/4 @ 633 nm | ±0.2 mm | |
| CM254-025-M01 | 25.0 mm | 7.6 mm | 50.0 mm (1.97") | ||||
| CM254-050-M01 | 50.0 mm | 6.8 mm | 100.0 mm (3.94") | ||||
| CM254-075-M01 | 75.0 mm | 6.5 mm | 150.0 mm (5.91") | ||||
| CM254-100-M01 | 100.0 mm | 6.4 mm | 200.0 mm (7.87") | ||||
| CM254-150-M01 | 150.0 mm | 6.3 mm | 300.0 mm (11.81") | ≤λ/4 @ 633 nm | ±0.1 mm | ||
| CM254-200-M01 | 200.0 mm | 6.2 mm | 400.0 mm (15.75") | ||||
| CM254-250-M01 | 250.0 mm | 6.2 mm | 500.0 mm (19.69") | ||||
| CM254-500-M01 | 500.0 mm | 6.1 mm | 1000.0 mm (39.37") | ||||
| CM254-750-M01 | 750.0 mm | 6.1 mm | 1500.0 mm (59.06") | ||||
| CM254-1000-M01 | 1000.0 mm | 6.0 mm | 2000.0 mm (78.74") |
| Item # | Focal Length | Center Thickness | Edge Thickness | Radius of Curvature | Surface Irregularity | Thickness Tolerance | Reference Drawing |
|---|---|---|---|---|---|---|---|
| CM508-038-M01 | 38.1 mm | 9.0 mm | 13.3 mm | 76.2 mm (3.00") | λ/4 @ 633 nm | ±0.2 mm | |
| CM508-050-M01 | 50.0 mm | 12.2 mm | 100.0 mm (3.94") | ||||
| CM508-100-M01 | 100.0 mm | 10.6 mm | 200.0 mm (7.87") | ||||
| CM508-150-M01 | 150.0 mm | 10.1 mm | 300.0 mm (11.81") | ||||
| CM508-200-M01 | 200.0 mm | 9.8 mm | 400.0 mm (15.75") | ||||
| CM508-500-M01 | 500.0 mm | 9.3 mm | 1000.0 mm (39.37") | ≤λ/4 @ 633 nm | ±0.1 mm | ||
| CM508-750-M01 | 750.0 mm | 9.2 mm | 1500.0 mm (59.06") | ||||
| CM508-1000-M01 | 1000.0 mm | 9.2 mm | 2000.0 mm (78.74") |
| Item # | Focal Length | Center Thickness | Edge Thickness | Radius of Curvature | Surface Irregularity | Thickness Tolerance | Reference Drawing |
|---|---|---|---|---|---|---|---|
| CM750-056-M01 | 56.25 mm | 12.0 mm | 18.4 mm | 112.5 mm (4.43") | λ/4 @ 633 nm | ±0.2 mm | |
| CM750-075-M01 | 75.0 mm | 16.7 mm | 150.0 mm (5.91") | ||||
| CM750-150-M01 | 150.0 mm | 14.3 mm | 300.0 mm (11.81") | ||||
| CM750-200-M01 | 200.0 mm | 13.7 mm | 400.0 mm (15.75") | ||||
| CM750-500-M01 | 500.0 mm | 12.7 mm | 1000.0 mm (39.37") |
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