Selection of optical mirror
Mirrors for optical experiments are made of high-precision polished glass substrates coated with metal or dielectric coating using a vacuum coating device. Depending on the coating, optical properties with various reflectivity characteristics can be obtained. According to the optical characteristics, select the mirror that meets the requirements of the technical indicators.
Comparison of reflectivity characteristics of representative mirror coatings
image
Features of mirrors
| wdt_ID | Coating Type | Compliant product | Features | Application |
|---|---|---|---|---|
| 1 | Metal Coating | Aluminum Coating (TFA) Gold Coating (TFG/TFGS) Silver Coating(TFAG) | Affordable. Can be used in a broad wavelength spectrum. Can be used at all angles of incidence. The film absorbs and the reflectivity decreases slightly. Easily damaged (unprotected, gold-coated mirrors) | simple optical system Optical systems using low output lasers White Light Illumination System or Imaging System Infrared optical system (gold film mirror) |
| 2 | Broadband Multilayer Dielectric Coating | Ultra Wide Spectrum (TFMS) Broadband Spectral Region (TFM2) | High reflectivity can be used in a wide wavelength spectrum. The film has no light absorption. The film is hard and not easily damaged. | Precision optical systems (low-light or low-loss optical systems) Laser optical system within 1W Optical systems using multi-wavelength lasers |
| 3 | Multilayer Dielectrics for Lasers Coating | For laser (TFM) For intense laser (TFMHP) | The reflectivity is very high with very little loss. The film has no light absorption and has a high laser damage threshold. Not easily damaged. It has a narrow wavelength range and is used when the incident angle is 45°. | Optical systems using lasers Strong Laser Optical System (TFMHP) |
The mirror of the multilayer dielectric reflective coating may also have various characteristics other than reflectivity characteristics.
| wdt_ID | Types of Mirror | Features |
|---|---|---|
| 1 | Super Reflector (TFSM) | It is a mirror, it has low scattering loss and high reflectivity of 99.999%. |
| 2 | Mirrors for Femtosecond Lasers Femtosecond Low Dispersive Reflectance (FLM/FLMHP) Femtosecond Negative Dispersion Mirror (GFM/GCM) | Femtosecond lasers can be used in both broad spectral regions, low dispersion, Multilayer dielectric mirrors with advanced photodamage threshold characteristics. |
| 3 | Multilayer Dielectric Coating Mirrors for Intensive Lasers (TFMHP) | The special structure of the multilayer film can withstand high-energy pulsed laser light. |