An optical etalon (also called Fabry–Pérot etalon) was originally a Fabry–Pérot interferometer in the form of a transparent plate (often made of fused silica) with parallel reflecting surfaces (solid etalon). However, the term is often also used for Fabry–Pérots consisting of two mirrors with some air gap in between (air-spaced etalon).
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| MATERIALS | PROPERTIES AND APPLICATIONS |
| Etalon | Fused Silica, Optical-Grade Silicon, Zerodur | an etalon acts as an optical resonator (cavity) in laser system where the transmissivity varies approximately periodically with the optical frequency. An etalon can therefore be used as an adjustable optical filter, e.g. for tuning the wavelength of a laser. |
| ATTRIBUTE | SPECIFICATIONS |
| Material | Fused Silica, Optical-grade Silicon, Zerodur |
| Typical free spectral range (FSR) | 25 GHz/50 GHz/100 GHz (Other FSR avaible) |
| PARALLEL FOCAL LENGTH TOLERANCE | ±2% |
| FSR Tolerance | ±0.0025 GHz |
| CLEAR APERTURE | >90% |
| SURFACE QUALITY | 20/10 scratch and dig |
| BEVEL | < 0.2 mm x 45° |
