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About Contacts Products AgGaSe2 AgGaS2 Ag Ga 1-x In x Se 2 Projectsdot.gif
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Structural and Physical Properties
Crystal symmetry and class Tetragonal, D2d
Space group D122d
Cell parameters (A) a = 5.992,c = 10,886
Melting points (oC) 851
Optical homogeneity Dn < 1*10-4
Density (gram/cm3) 5.71
Absorption coefficient
(cm -1)

< 0.005
Optical and NLO Properties
Optical transmission ( mm ) 0.75 to 18.0
Fundamental absorption edge ( mm ) 0.68
Energy gap (eV) 1.83
Isotropic wavelength ( mm ) 0.811

Laser damage threshold
( t = 10 ns, l = 1.06 mm) (MW/cm2)
20 at surface
Dispersion of refractive indices
(Experimental values)
l (mm) no ne
0.725 2.8452 2.8932
1.064 2.7010 2.6782
2.0 2.6376 2.6071
3.0 2.6245 2.5925
5.3 2.6134 2.5808
10.6 2.5912 2.5579
12.0 2.5637 2.5505
13.5 2.5731 2.5404
Nonlinear optical coefficients:
d36 (10.6 mm) = ( 0.37 ± 0.04 ) d36 ( GaAs ) = ( 33 ± 3 ) pm/V
dooe = d36 sin q sin 2j
deoe = doee = d36 sin 2q cos 2j

Dispersion of refractive indices ( Sellmeier equations, l in mm )
n2o = 16.90818630 - 80435.353720 / ( 8000.0 - l2 ) - 0.40906365 / ( 0.19198641 - l2 );
n2e = 17.21991454 - 84232.426432 / ( 8000.0 - l2 ) - 0.39636678 / ( 0.28335632 - l2 ).

Application

The AgGaSe2 crystals are used for frequency doubling and three-frequency mixing. The parametric oscillators on the base of those crystals can produce the continuously tunable radiation in the spectral range from 1.34 mm to 18 mm with suitable pump laser. The low absorption of our AgGaSe2 crystals results in the fact, that 80 mm length element has transmission value 66.4% on 1.06 mm wavelength, which is in accordance with the theoretical value of Fresnel loses for the crystal without of any absorption. We offer you the big size crystals with high quality and the moderate price. With those crystals the record results of conversion efficiency in comparison with all known infrared materials have been obtained. SHG efficiency of CO2 laser radiation for 40 mm length elements was about 20% (pulse
length 80 ns, pump energy - 2 J). Wide aperture of 17*l7*40 mm AgGaSe2 elements gives an opportunity of radiation wavelength tuning from 9 to 12 mm by means of the crystal turning.

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