BaGa2GeSe6

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BaGa2GeSe6 (Barium Selenium Germanium Gallium), referred to as BGGSe crystal. It is a tripartite crystal system R3 space group with the following characteristics:

  • High laser damage threshold
  • Wide transmission range (0.5~18μm)
  • Moderate birefringence (0.08~0.11)
  • Large nonlinear coefficient (d11=23.6 pm/V)
  • Stable chemical properties
  • No tedious post-treatment such as annealing and its surface high chemical stability
  • No post-growth treatment
  • High crystal symmetry, and easy processing

Capable of being pumped using Nd: YAG laser, it has important potential for infrared laser frequency conversion such as CO and CO2 laser frequency doubling and optical parametric oscillation to generate mid- and far-infrared lasers. Due to the low dispersion nature and high damage threshold of the BGGSe crystal, it has advantages in ultra-wide mixing and ultra-short pulse output.

Features of BaGa2GeSe6

  • Large nonlinear optical effect
  • High laser damage threshold
  • Wide range of light transmission
  • High crystal symmetry, easy to process
  • Insoluble in dilute acids, good chemical stability
  • No tedious post-processing such as annealing
  • The frequency multiplication factor is 6 times that of AgGaS2
  • High transmittance and birefringence in the far infrared range

Physicochemical Properties

Crystal SystemTripartite system, space group R3
Nonlinear Coefficient
d11=66pm/V
Damage Threshold
110MW/cm2
Lattice Constant
a=9.5967(5)Å，b=9.5967(5)Å，c=8.6712(7)Å，α=β=90°，γ=120°，Z=1
Transparency range
0.5 -18μm
Birefringence
0.08-0.11
Melting Point
880℃

Processing Parameters

Directional accuracy<+-0.1°
Surface Finish
20/10 per MIL-O-13830A 
Flatness
λ/8@632.8nm for T>=1mm
Smooth Surface Tolerance+0/-0.1mm
Length Tolerance±0.1mm
Parallelism
30″
Perpendicularity
10′
Chamfer
<0.2mm×45°

Spectrum

Nonlinear crystal BaGa2GeSe6 transmission-CRYLINK
Transmittance curve of BGGSe single crystal

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