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* Welcome To AgGaS2 & AgGaSe2 Crystal *
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AgGaS2 & AgGaSe2

Silver Gallium Sulfide (AgGaS2) and Silver Gallium Selenite (AgGaSe2) crystals have attained special interest for the middle and deep infrared (IR) applications due to its 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.

Physical Properties:

AgGaS2 

AgGaSe2

Crystal Structure

Tetragonal

Tetragonal

Cell Parameters(A)

a=5.756, c=10.301

a=5.992, c=10.886

Melting Point(șC)

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

Relative Dielectric Constant
e11s/eo @ 25 MHz
e11s/eo @ 25 MHz

 

10
14

 

10.5
12.0

Thermal Expansion Coefficient
(10
-3/ șC) ||C
^C

 

+12.5
-13.2

 

+16.8
-7.8

Thermal Conductivity (W/cm/șC)

0.015

 

Optical Properties:

 

AgGaS2

AgGaSe2

Transparency Range(μm)

0.50-13.2

0.78-18.0

Phase-Matching SHG range(mm)

1.8-11.2

3.1-12.8

Thermo-Optic Coefficient
d
no/dt(10-5/șC)
d
ne/dt(10-5/șC)

 

15.4
15.5

 

~15
~15

Linear Electro-optic Coefficients
g41T
g63T

 

4.0+/-0.2
3.0+/-0.1

 

4.5@1.15mm
3.9@1.15
mm

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

NLO Susceptibilities d36(pm/V)
SHG @ 10.64
mm

 

18

 

58

Relative Indices
@ ~ 10ns, 1.064
mm
@ ~ 10ns, 10.6
mm

25,surface
>500 bulk

20-30,surface

Wavelength @no=ne(mm)

0.4974

0.811

Sellmeier Equations(λ in μm)

AgGaS2 

no2 (l)= 3.3970 + 2.3982/(1 - 0.09311/l2) + 2.1640/(1 - 950/l2)
ne2 (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)
ne2 (l)= 5.2912 + 1.3970/(1 - 0.2845/l2) + 1.9282/(1 - 16007/l2)

         

Specifications:

Dimension Tolerance

±0.1mm

Flatness

λ/8@633nm

S/D

10/5 to MIL-O-13830A

Parallelism

20"

Perpendicularity

5 arc minutes

Angle Tolerance

Δθ<0.5°Δj>0.5


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