| Material | Co2+:MgAl2O4 | Orientation | <111>+/-0.5° |
| Doping Rate of Co2+ | 0.05-0.3 atm% | Optical Density | 0.1-0.9 |
| Optical Density | 0.1-0.9 | Absorption Coefficient | 1.0cm-1-7cm-1 |
| Transmittance | 30%-99% | Absorption Section | 3.5 x 10-19cm2 |
| Thickness/Diameter Tolerance | +/-0.1mm | Parallelism | 10″ |
| Perpendicular | 5′ | Surface Quality | 10/5 |
| Wavefront Distortion | Lambda/8 @ 632nm | Flatness | Lambda/8 @ 632nm |
| Aperture | >90% | Chamfer | 0.1 x 45° |
| HR Coating | ≦0.2%(@ 1533nm) | Damage Threshold | >500MW/cm2 |
Co2+:MgAl2O4 (Co2+:Spinel or Co:MALO) crystal is a new material for passive Q-switching in lasers emitting from 1.2 to 1.6 µm, in particular, for eye-safe 1.54 µm Er:glass laser, but also works at 1.44 µm and 1.34 µm wavelengths. High absorption cross section (3.5 × 10-19cm2) permits Q-switching of Er:glass laser without intracavity focusing both with flash-lamp and diode-laser pumping. Negligible excited-state absorption results in high contrast of Q-switch, i.e., the ratio of initial (small signal) to saturated absorption is higher than 10.
Shanghai North Optics offers high-quality Co:Spinel crystals materials with high optical quality and uniform distribution of Co2+ in laser-grade polishing and coatings.
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