AgGaS2 and AgGaSe2 Crystal

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Silver Gallium Sulfide (AgGaS2) and Silver Gallium Selenite (AgGaSe2) crystals have recently attained special interest for the middle and deep infrared (IR) applications. due to their large nonlinear optical (NLO) coefficients and high transmission in the IR region. The phase matching and transmission characteristics of AgGaS2 allow 3-wave interactions in the mid and near IR, AgGaS2 has been used as an efficient NLO crystal for 3 - 10 mm IR output, particularly for OPO devices pumped with Nd:YAG laser, frequency mixing of OPO outputs pumped by Ti:Sapphire or Nd:YAG laser, as well as frequency mixing Nd:YAG laser with dye and Ti:Sapphire or other laser sources. AgGaS2 has also been demonstrated to be an efficient frequency doubling crystal for infrared radiation such as 10.6 mm output of CO2 lasers. 

Structure and Physical Properties  

AgGaS2 
AgGaSe2
Crystal Structure
Tetragonal
Tetragonal
Cell Parameters ()
a=5.756, c=10.301
a=5.992, c=10.886
Melting Point(C)
997
581
Density (g/cm3)
4.702
5.700
Absorption Coefficient(cm-1)
@ 1.064 mm
@ 10.6 mm

0.01
0.6

< 0.05
< 0.02
Resistance
>1012
unavailable
Relative Dielectric Constant
e11s/eo @ 25 MHz
e11s/eo @ 25 MHz

10
14

10.5
12.0
Thermal Expansion Coefficient 
(10-3/ deg;C) ||C
^C

+12.5
-13.2

+16.8
-7.8
Thermal Conductivity (W/cm/ C)
0.015
unavailable

 

Linear Optical Properties

AgGaS2
AgGaSe2
Transparency Range(nm)
0.50-13.2
0.78-18.0
Relative Indices
@ 1.064
mm
@ 5.300
mm
@ 10.60
mm
no
2.4521
2.3945
2.3472
ne
2.3990
2.3408
2.2934
no
2.7010
2.6134
2.5912
no
2.6792
2.5808
2.5579
Wavelength @no=ne(mm)
0.4974
0.811
Thermo-Optic Coefficient
dno/dt(10-5/C)
dne/dt(10-5/C)

15.4
15.5

~15
~15
Sellmeier Equations
AgGaS2:
no
2 (
l)= 3.3970 + 2.3982/(1 - 0.09311/l2) + 2.1640/(1 - 950/l2)
ne
2 (
l)= 3.5873 + 1.9533/(1 - 0.11066/l2) + 2.3391/(1 - 1030.7/l2)
AgGaSe2:
no2 (
l)= 4.6453 + 2.2057/(1 - 0.1879/l2) + 1.8577/(1 - 1600/l2)
ne
2 (
l)= 5.2912 + 1.3970/(1 - 0.2845/l2) + 1.9282/(1 - 16007/l2)

 

Nonlinear Optical Properties  

AgGaS2
AgGaSe2
Phase-Matching SHG range(mm)
1.8-11.2
3.1-12.8
NLO Susceptibilities d36(pm/V)
SHG @ 10.64 mm
18
58
Linear Electro-optic Coefficients
g41T
g63T

4.0+/-0.2
3.0+/-0.1

4.5@1.15mm
3.9@1.15mm
Relative Indices
@ ~ 10ns, 1.064mm
@ ~ 10ns, 10.6mm
25,surface
>500 bulk
20-30,surface

 

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