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
Related Items
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| 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 2024-08-27 19:02:25.567) I'm conducting an experiment involving the far-infrared to near-infrared range. Could you please provide a reflectivity graph up to 200 micrometers? cdolbashian
(posted 2024-08-30 12:29:18.0) Thank you for reaching out to us with this inquiry. While we have not directly taken these measurements up to 200um, literature suggests that protected gold (gold with SiO2 overcoat) is highly reflective (>90%) up to and including the stated range. I have contacted you directly to share the journal articles which I have sourced this information. 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. |
Click on a particular graphed line or the corresponding name in the legend to view concave mirrors with that coating option.
Metallic-Coated Concave Mirrors are available in UV Enhanced Aluminum, Aluminum, Silver, and Gold.
Concave Dielectric Coated Mirrors
Click to Enlarge
Raw Data
Reflectance of -E02 Dielectric-Coated Concave Mirrors at 8° AOI.
These mirrors are also available with a Back Side Polish.
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Click to Enlarge
Raw Data
Reflectance of -E03 Dielectric-Coated Concave Mirrors at 6° AOI.
These mirrors are also available with a Back Side Polish.
Concave Crystalline Coating Mirrors
| 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") |
Additional Concave Mirrors
Gold-Coated Concave Mirrors