Cobalt Spinel is a remarkable Q-switching crystal with the formula Co:MgAl₂O₄. It absorbs light across a wide wavelength band from 1200 to 1600nm. It’s a good passive Q-switch for lasers operating at the eye-safe 1.5 micrometer wavelength.
High Damage Threshold
Good Thermal Stability
High Optical Quality
Mechanical and Chemical Stability
SPECIFICATIONS | |
Concentration | 0.05wt%~0.35wt% |
Absorption coefficient | 0~7 cm-1 |
Ground-state absorption cross-section GSA | 2.8(±0.4)E-19cm2@1340nm |
Excited state absorption cross-section ESA | 2.0(±0.6)E-20cm2@1340nm |
Ground-state absorption cross-section GSA | 3.5(±0.4)E-20cm2@1540nm |
Excited state absorption cross-section ESA | 1.0(±0.6)E-20cm2@1540nm |
Working wavelength | 1200~1600 nm |
End Configuration | Flat/Flat |
Figure of Merit(FOM) | 100~300 |
Coatings | AR/AR@1540，R<0.2%; |
PHYSICAL AND CHEMICAL PROPERTIES | |||
Chemical formula | Co2+:MgAl2O4 | ||
Crystal structure | Cubic | ||
Lattice parameters | 8.07Å | ||
Density | 3.62 g/cm3 | ||
Melting Point | 2105°C | ||
Refractive Index | n=1.6948 @1.54 μm | ||
Thermal Conductivity/(W·cm-1·K-1@25°C) | 0.033W | ||
Thermal Expansion /(10-6 /°C@25°C ) | 1.046 | ||
Specific Heat/ (J·g-1·K-1) | 5.9 | ||
Hardness (Mohs) | 8.2 | ||
Extinction Ratio | 25dB | ||
Orientation | <100> or <111> < ±0.5° | ||
Optical density | 0.1~0.9 | ||
Damage Threshold | >500 MW/cm2 | ||
Doping concentration of Co2+ | 0.01-0.3 atm% | ||