Nanjing Crylink Photonics Co.,Ltd
Growing crystal, Lingling Value.
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Cobalt-doped magnesium aluminate spinel (Co:MgAl2O4) allow the generation of short nanosecond pulse with high peak power around the eye-safe wavelength of 1.5um,perfect for telemetry applications. The absorption spectrum of Co2+-doped MgAl2O4 exhibited a broad absorption band in the wavelength range of 12001600 nm, which indicated that Co2+ ions substituted for the tetrahedrally coordinated Mg2+ ions in the MgAl2O4 lattice. Passive Q-switching of solid-state lasers with solid-state saturable absorbers is a very attractive Q-switching technique because it allows to develop compact and low cost laser sources of nano and sub nanosecond pulses far various applications
Co spinel——saturable absorbers for the passive Q-switching of solid-state lasers operating at eye-safe wavelength of 1.5 m
Lasers emitting at 1.5m are of great interest for several industrial applications. This interest is, rst of all, due to eye-safety of 1.5-m radiation. Other advantages of this wavelength are high transparency in atmosphere and fused-silica wave guides and availability of sensitive room temperature light detectors(Ge and InGaAs photo diodes).All this makes 1.5m lasers very attractive for applications in range-finder, environmental sensing, telecommunications, surgery,etc. Co:Spinel absorption peak is close to 1520nm,which is most used in eye-safe laser. The absorption cross-section at 1520nm is 3.5×10-19cm2 and at 1331 is 2.8×10-19cm2,it has reported as Q-switch crystal for Er,Yb Glass and Nd:GYSGG,Nd:YALO3.
Physical and Chemical Properties
| Property | Value |
| Chemical formula | Co2+:MgAl2O4 |
| Crystal structure | Cubic |
| Lattice parameters | 8.07 |
| Density | 3.62 g/cm3 |
| Melting Point | 2105°C |
| Refractive Index | n=1.6948 @1.54 m |
| Thermal Conductivity/(Wcm-1K-1@25°C) | 0.033W |
| Thermal Expansion /(10-6 /°C@25°C ) | 1.046 |
| Specific Heat/ (Jg-1K-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% |
Metarial and Specifications
| Property | Value |
| Concentrations | (0.05~0.35) wt% |
| Absorption coefficient | 07 cm-1 |
| Ground-state absorption cross-section GSA(E-19 cm2) |
2.8(±0.4)@1340nm |
| Excited state absorption cross-section ESA(E-20 cm2) |
2.0(±0.6)@1340nm |
| Ground-state absorption cross-section GSA(E-20 cm2) |
3.5(±0.4)@1540nm |
| Excited state absorption cross-section ESA(E-20 cm2) |
1.0(±0.6)@1540nm |
| Working wavelength | 1200 1600 nm |
| End Configuration | Flat/Flat |
| Figure of Merit(FOM) | 100~300 |