A passive Q-switch or saturable absorber provides high power laser pulses without the need for an electro-optic Q-switch, thus reducing the package size eliminating the need for a high voltage power source. Altechna provides a variety of solid-state saturable absorbers such as Co:sapphire, Cr4 :AG, V3 :YAG, etc. For Nd and Yb doped lasers (especially for Nd:YAG, Nd:YLF or Y:YAG), Cr4 :YAG is a fine passive Q-switching crystal if the wavelength is in the range of 900-120nm.
Parameter indicators:
| Aperture | max 40X40mm, min2X2mm |
| Size tolerance | ± 0.1mm |
| Parallelism | ≤20 arc seconds |
| Verticality | ≤5 arc minutes |
| Surface finish | 20-10 |
| Flatness | λ/10 @ 633 nm |
| Angle tolerance | Δθ≤0.25°, Δφ≤0.25° |
| Chamfer | ≤0.2mmx45° |
| Crack | ≤0.1mm |
| Damage threshold | > 800MW/cm2 at 10Hz |
| Wavelength range | 1064nm |
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