Introduction
Co2+:MgAl2O4 is a relatively 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
(3.5×10-19 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 of Q-switch, i.e.
the ratio of initial (small signal) to saturated
absorption is higher than 10.
Characteristics of Spinel Crystal |
crystals structure |
cubic |
Spatial group |
Fd3m |
Element ary cell parameters, |
0.8086nm |
Thermal Conductivity |
17W/m.k @20deg. |
Thermal Expansion |
7.33x10-6/k |
Modulus of elasticity |
2.3x 10^5 |
Density, |
3.58g/cm 3 |
Mohs hardness |
8 |
Melting point, |
2105 ° C |
Refraction index |
1.6.-1.75 |
486.1nm |
1.72433 |
2.2 m m |
1.6848 |
546.1nm |
1.71976 |
3.0 m m |
1.6678 |
589.3nm |
1.71611 |
4.0 m m |
1.6387 |
656.3nm |
1.71268 |
5.0 m m |
1.5985 |
Working wavelength range, 1.2 – 1.6μm
Absorption cross-section, 3.5×10-19 (at 1.54 μm)cm2
Specifications:
T0 |
From 30% to 98% 1540nm |
Dimension tolerance |
(W ± 0.1 mm) x (H ± 0.1 mm) |
Transmitting wavefront distortion: |
l/8 @ 633 nm |
Clear aperture: |
> 90% central area |
Flatness: |
l/8 @ 633 nm |
Scratch/Dig code: |
10/5 to MIL-O-13830A |
Parallelism: |
better than 20 arc seconds |
Perpendicularity: |
5 arc minutes |
Angle tolerance: |
Dq < ±0.5°, Df < ± 0.5° |
AR coating: |
R< 0.2% at 1540nm |
Quality Warranty Period: |
one year under proper use. |
Note:
When
ordering Co:MgAl2O4 crystal, please specify the
aperture, initial transmission(To) and coatings. |