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AgGaSe2
(Silver Gallium Selenite, AGSE)
AgGaSe2 crystal is
useful for the middle and deep infrared applications due to its large
nonlinear optical (NLO) coefficients and high transmission in the IR region.
It has been used as an efficient NLO crystal for 3 - 10
µm 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. AgGaSe2
has also been demonstrated to be an efficient frequency doubling crystal for
infrared radiation such as 10.6
µm output of CO2
lasers.
Please contact Newlight
Photonics Inc. for the cut angles, dimensions, and coatings of AgGaSe2
crystals that may be suitable for your applications.
Structure and Physical Properties
|
Crystal Structure |
Tetragonal |
|
Cell Parameters |
a=5.992Å, c=10.886Å |
|
Melting Point |
851°C |
|
Density |
5.700 g/cm3 |
|
Mohs Hardness |
3-3.5 |
|
Absorption Coefficient |
<0.05cm-1
@ 1.064
µm
<0.02 cm-1
@ 10.6
µm |
|
Relative Dielectric Constant
@ 25 MHz |
ε11s=10.5
ε11t=12.0 |
|
Thermal Expansion Coefficient |
||C: -8.1 x 10-6/°C
⊥C: +19.8 x 10-6/°C |
|
Thermal Conductivity |
1.0 W/M/°C |
Linear Optical Properties
|
Transparency Range |
0.78-18.0 μm |
Refractive Indices
@ 1.064
µm
@ 5.300
µm
@ 10.60
µm |
no
2.7010
2.6134
2.5912 |
ne
2.6792
2.5808
2.5579 |
|
Thermo-Optic Coefficient |
dno/dt=15.0
x 10-5/°C
dne/dt=15.0 x
10-5/°C |
Sellmeier Equations
( λ
in
µm) |
no2=4.6453+2.2057/(1-0.1879/λ2)+1.8577/(1-1600/λ2)
ne2=5.2912+1.3970/(1-0.2845/λ2)+1.9282/(1-16007/λ2) |
Nonlinear Optical Properties
|
Phase-Matching SHG Range |
3.1-12.8
µm
|
|
NLO Coefficients @ 10.6µm |
d36=d24=d15=39.5 pm/V
|
|
Linear Electro-optic Coefficients |
γ41T=4.5
pm/V
γ63T=3.9
pm/V
|
Damage Threshold
@ ~ 10ns, 1.064µm |
20-30 MW/cm2 (surface)
|
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