Silver Gallium Sulfide Crystal | AGS Crystal | AgGaS2

Chemical Formula

AgGaS₂

Lattice Symmetry and Point Group

Tetragonal, D2d

Space Group

D122d

Unit Cell Parameters (Å)

a=5.742, c=10.305

Melting Point (°C)

980

Crystal Optical Uniformity (Refractive Index Deviation)

Δn < 1×10⁻⁴

Density (g/cm³)

4.58

Absorption Coefficient (cm⁻¹)

< 0.005

Optical Transmission Range (μm)

0.47 to 12.5

Energy Gap (eV)

2.8

Isotropic Wavelength (μm)

0.497

Refractive Index (Measured Values)

λ (μm)

no

ne

0.53

2.6148

2.6145

0.65

2.5417

2.4941

1.064

2.4489

2.3952

2.0

2.4131

2.3594

10.6

2.3449

2.2908

Damage Threshold

(τ=10 ns, λ=1.06 μm), 20 MW/cm²

Nonlinear Optical Coefficients

d₃₆ (10.6μm) = 0.15d₃₆ (GaAs) = 13.4 pm/V

d₀₀ₑ = d₃₆ sinθ sin2φ

dₑ₀ₑ = d₀ₑₑ = d₃₆ sin2θ cos2φ

Dispersion Equations (Sellmeier Equations, λ in μm)

no² = 4.4368659 + 541.97177 / (400 + λ²) - 0.21334425 / (0.10173910 - λ²)

ne² = 4.1704137 + 550.23080 / (400 + λ²) - 0.19289371 / (0.13312863 - λ²)

Experimental Results with AgGaS₂

Pumping Laser

1.06 μm

30 ps Mode-Locked Laser Output Wavelength

4 ~ 10 μm

Quantum Conversion Efficiency (%)

2.8 (λ=5.2 μm)

1.6 (λ=6.3 μm)

0.6 (λ=7.1 μm)

Clear Aperture

85%

Surface Dimension Tolerance

+0/-0.2 mm

Thickness Tolerance

±0.2 mm

Parallelism Error

<30 arcsec

Protective Bevel

<0.2 mm at 45°

Surface Quality

20-10 S-D

Surface Dimension

Length

θ

φ

Application

Coating

5x5 mm

1 mm

39°

45°

DFG @ 1.2-2.4 μm, Type I

BBar/BBar @ 1.2-2.4/2.4-11 μm, AOI=0°

8x8 mm

1 mm

39°

45°

DFG @ 1.2-2.4 μm, Type I

BBar/BBar @ 1.2-2.4/2.4-11 μm, AOI=0°

6x6 mm

2 mm

50°

0°

DFG @ 1.2-2.4 μm, Type I

BBar/BBar @ 1.2-2.4/2.4-11 μm, AOI=0°

8x8 mm

2 mm

50°

0°

DFG @ 1.2-2.4 μm, Type I

BBar/BBar @ 1.2-2.4/2.4-11 μm, AOI=0°