Passive Q-switches or saturable absorbers generate high power laser pulses without the use of electro-optic Q-switches, thereby reducing the package size and eliminating a high voltage power supply. Co2+:MgAl2O4 is a relatively new material for passive Q-switching in lasers emitting from 1.2 to 1.6μm, in particular, for eye-safe 1.54μm Er:glass laser, but also works at 1.44μm and 1.34μm laser wavelengths. Spinel is a hard, stable crystal that polishes well. Cobalt substitutes readily for magnesium in the Spinel host without the need for additional charge compensation ions. High absorption cross section (3.5×10-19 cm2) 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 ratio of Q-switch, i.e. the ratio of initial (small signal) to saturated absorption is higher than 10.
•  Suitable for 1540 nm eye-safe lasers
•  High absorption section
•  Negligible excited state absorption
•  High optical quality
•  Uniformly distributed Co
•  Eye-safe 1540 nm Er:glass laser
•  1440 nm laser
•  1340 nm laser
•  Eye-safe laser range finder
| 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 | 
| Specific Heat/ (J·g-1·K-1) | 1.046 | 
| Thermal Expansion /(10-6 /°C@25°C ) | 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% | 
| Absorption coefficient | 0 ~ 7 cm-1 | 
| Working wavelength | 1200 – 1600 nm | 
| Coatings | AR/AR@1540,R<0.2%; AR/AR@1340,R<0.2% | 
| Orientation Tolerence | < 0.5° | 
| Thickness/Diameter Tolerance | ±0.05 mm | 
| Surface Flatness | <λ/8@632 nm | 
| Wavefront Distortion | <λ/4@632 nm | 
| Surface Quality | 10/5 | 
| Parallel | 10〞 | 
| Perpendicular | 5ˊ | 
| Clear Aperture | >90% | 
| Chamfer | <0.1×45° | 
| Maximum dimensions | Dia(3-15)×(3-50)mm | 
 
               
               By Betsy from Ecuador - 2018.07.12 12:19
 By Betsy from Ecuador - 2018.07.12 12:19
               By Ingrid from Lesotho - 2018.06.21 17:11
 By Ingrid from Lesotho - 2018.06.21 17:11
               
             
             
             
             
             
            