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AgGaS2
 

AgGaSe2, AgGaS2 are nonlinear optical crystals, which have gained tremendous interest for the middle and deep infrared applications due to their unique features. The crystals have large effective optical nonlinearity, wide spectral and angular acceptance, broad transparency range, noncritical requirements for temperature stabilization and vibration control, are well mechanically processed.

Related Products:

AgGaSe's useful transmission ranges lying within 0.9-16μm and wide phase matchability provides excellent potential for OPO applications when pumped by variety of currently available lasers.

AgGaS2 high short wavelength transparency edging at 550nm has been used in OPOs pumped by Nd:YAG laser; in numerous difference frequency mixing experiments using diode, Ti:Sapphire, Nd:YAG and IR dye lasers covering 3-12 μm range; direct infrared countermeasure systems, and SHG of CO2 laser.

 
Specification
Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L +/- 0.2 mm)
Transmitting wavefront distortion: l/8 at 633 nm
Clear aperture: > 90% central area
Flatness: /8 @633nm
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< 0.1% at 1064nm and R<0.4% at 532 nm
Quality Warranty Period: one year under proper use

The Sellmeier equations ( l in μm ):

AgGaSe2
 no2=6.8507+0.4297/(2-0.15840)-0.001252
ne2=6.6792+0.4598/(2-0.21220)-0.001262
AgGaS2
 no2=3.3970+2.3982/(1-0.09311/2)+2.1640/(1-950.0/2)
ne2=3.5873+1.9533/(1-0.11066/2)+2.3391/(1-1030.7/2)
 
Standard Products (AgGaS2)  
Part Number
Dimension
Application
Coating

AGS551
5x5x1mm
OPO @ 1.2-2.4 μm -> 2.4-11 μm
BBAR/BBAR @ 1.1-2.6 / 2.6-11 μm

AGS662
6x6x2mm
OPO @ 1.2-2.4 μm -> 2.4-11 μm
BBAR/BBAR @ 1.1-2.6 / 2.6-11 μm
AgGaSe2
AgGaS2
AgGaSe2
AgGaS2

Crystal Symmetry

Tetragonal
Tetragonal
Optical transmission,μm
0.73-18
0.5-12

Point Group
42 m
42 m
Indices of refraction at

Lattice ConstantsΛ(a)
5.9901
5.757
1.06μm
no
2.7005
2.4508

Lattice ConstantsΛ(c)
10.8823
10.305
ne
2.6759
2.3966
Density:g/cm3
5.71
4.56
5.3μm
no
2.6140
2.5823
Laser damage threshold
ne
2.5823
2.3421
25 MW/cm2 at 50ns 2.05μm
25 MW/cm2 at 20ns 1.06μm
10.6 μm
no
2.5915
2.5915
Nonlinearity pm/V
43
31
ne
2.5915
2.5915
Phase matching angle for Type 1 SHG at 10.6 μm
55°
67°
Absorption Coefficient cm-1 at
1.06μm
<0.02(9)
<0.02
Walk-off angle at 5.3 μm
0.67°
0.85°
2.5μm
<0.01
0.01
Melting point °C
851
998
5.0μm
<0.01
0.01
Thermal Expansion
23.4
12.5
7.5μm
-//-
0.02
Coefficient 10-6/°K
23.4
-13.2
10.0μm
-//-
<0.06