Dichroic mirror
A dichroic mirror is an optical element with multilayer coating used for wavelength-selective reflection and transmission, which can effectively separate or combine light beams of different bands. Based on the principle of thin-film interference, the dichroic mirror reflects a specific wavelength (e.g., laser lines, fluorescence spectra) with a reflectivity greater than 99%, and transmits other wavelengths with a transmittance greater than 99%. Dichroic mirrors are widely used in laser beam combining systems, fluorescence microscopes (separating excitation light and emission light), medical spectrometers and color projection optical paths, and feature a high damage threshold and low energy loss.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | N-BK7, UV fused silica, etc. |
| Typical diameter (Фmm) | 10.0 12.7 15.0 20.0 25.4 30.0 50.8 etc. |
| Dimensional Tolerance | ±0.1mm |
| Thickness Tolerance | ±0.2mm |
| Optical Aperture | >80% |
| Parallelism | 3'（Standard Type）、1'（High Accuracy Type） |
| Technical indicator photopurity | 60/40（Standard）、10/5（High Accuracy） |
| Surface form (per 25mm @633mm) | λ/4（Standard）、λ/8（High Accuracy） |
| Chamfer | <0.25mm x 45° |
| Coating | One side is HR@wavelength-1+HT@wavelength-2, the other side is AR@wavelength-2, AOI=0deg or 45deg |
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