BGSe

BGSe
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BaGa4Se7 (Barium Gallium Selenide), referred to as BGSe crystals, belongs to the monoclinic Pc (No. 7) space group. It has a large band gap (2.64 eV), a wide transmission range (0.47~18 μm), large nonlinear effects (d11=24.3 pm/V, d13=20.4 pm/V), moderate birefringence (Δn=0.06@2 μm) and a high laser damage threshold. The BGSe crystals have good growth performance and are easy to obtain large, high-quality single crystals suitable for high power output. A laser of 1~3 μm can pump the BGSe crystals to produce tunable lasers up to 18 μm in the mid- and far-infrared. Compared with ZnGeP2, BGSe can be pumped by one μm laser sources and easily prepared for large-aperture devices. BGSe is currently the best nonlinear optical crystal for frequency down-conversion output of mid and far-infrared lasers for mature one μm lasers.

Features of BaGa4Se7

  • Transparent bandwidth
  • High nonlinear coefficient
  • High thermal conductivity
  • Large band phase matching
  • High light damage threshold
  • 1064 nm pump has no two-photon absorption effect
  • Coverage 3-5 μ M and 8–14 μ M two important atmospheric windows have good mechanical properties and are easy to process

Basic Features

Chemical Formula
BaGa4Se7
Crystal SystemMonoclinic system, point group M, space group Pc
Lattice Constant
a＝7.6252（15）Å，b＝6.5114（13）Å，c=14.702(4)Å,β＝121.24(2)，Z＝2
Transparency range
0.47-18μm
Nonlinear Coefficient
d11 = 24 pm/V
Birefringence
0.07@2μm
Damage Threshold (μm, 5ns )550MW/cm2
Band Gap2.64eV
Sellmeier Equation
nx2=5.952953+0.250172/(λ2-0.081614)-0.001709λ2
ny2=6.021794+0.256951/(λ2-0.079191)-0.001925λ2
nz2=6.293976+0.282648/(λ2-0.094057)-0.002579λ2

Processing Parameters

Orientation Accuracy<+-0.1°
Surface Finish
60/40 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 crystals BGSe transmittance-CRYLINKNonlinear crystals BGSe transmittance -CRYLINK
2mm crystal slice (001) transmittance curve8mm transmittance curve
Nonlinear crystals BGSe phase matching -CRYLINK
Terahertz differential frequency process phase matching conditions based on BaGa4Se7 crystal

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