Co:MgAl2O4

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, 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 um	1.6848
546.1nm	1.71976	3.0 um	1.6678
589.3nm	1.71611	4.0 um	1.6387
656.3nm	1.71268	5.0 um	1.5985

Working wavelength range, 1.2 – 1.6μm
Absorption cross-section, 3.5×10-19 cm2 (at 1.54 μm)

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.