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AgGaSe2 Crystals

AgGaSe2 Crystals
AgGaSe2 Crystals

Silver Gallium Selenite (AgGaSe2, AGSE) crystal is of special interest for the middle and deep infrared (IR) applications due to its large nonlinear optical  coefficients and high transmission in the IR region.  Its IR cutoff wavelength of ~ 18 µm is much longer than that of the closely related crystal Silver Gallium Sulfide (AgGaS2).   The phase matching and non-linear optical properties of AgGaSe2 allow OPO/OPA's pumped with lasers at 1400-2100 nm ( e.g. Ho:YLF laser at 2.05 µm ) and different frequency generation (DFG) to generated tunable middle and deep infrared wavelengths.

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Structure and Physical Properties:

Crystal Structure Tetragonal
Cell Parameters  a=5.992 Å, c=10.886 Å
Melting Point 851 °C
Density  5.700 g/cm3
Mohs Hardness 3-3.5
Absorption Coefficient <0.05 cm-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:

NLO Coefficients @ 10.6 µm
d36=d24=d15=39.5 pm/V
Linear Electro-optic Coefficients
 γ41T=4.5 pm/V
 γ63T=3.9 pm/V
Damage Threshold
         @ ~ 10 ns, 1.064 µm
20-30 MW/cm2 (surface)

 

 

Specifications of AgGaSe2 components:
 

Dimension tolerance: (W +/-0.1 mm) x (H +/-0.1 mm) x (L + 0.2 mm/-0.1 mm) 
Clear aperture: > 90% central area 
Flatness: λ/4 @ 633 nm for T>=1 mm 
Surface Quality: Scratch/dig 20/10  
Parallelism: better than 60 arc seconds 
Perpendicularity: 5 arc minutes
Angle tolerance: Δθ < +/-0.25o, Δφ < +/-0.25o

 

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