BGGSe Crystal
WaveQuanta

BGGSe (BaGa2GeSe6) Nonlinear Crystal for Mid-IR, 0.5–18 µm, d11 = 66 pm/V

WQ-NLC-BGGSE
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BGGSe (BaGa2GeSe6) is a mid-infrared nonlinear crystal transparent from 0.5 to 18 µm, with a nonlinear coefficient of d11 = 66 ± 15 pm/V and an optical damage threshold of 110 MW/cm². It is used for frequency conversion of laser radiation into and within the mid-IR, including SHG of CO and CO2 lasers and difference-frequency generation. WaveQuanta supplies BGGSe as oriented blanks and as polished, uncoated elements.

Key Features

  • Transparency range 0.5–18 µm
  • Nonlinear coefficient d11 = 66 ± 15 pm/V
  • Optical damage threshold 110 MW/cm², compared with 78 MW/cm² for ZnGeP2, 30 MW/cm² for GaSe and 20 MW/cm² for AgGaSe2
  • Broadband two-stage frequency conversion of multi-line CO laser radiation within 2.5–9.0 µm, reported with higher efficiency than in ZnGeP2 and AgGaSe2
  • Some wavelength combinations give an effective nonlinear coefficient that changes only slightly over a wide frequency band

Typical Applications

  • Second-harmonic generation of CO and CO2 laser radiation
  • Two-stage frequency conversion of multi-line CO lasers within 2.5–9.0 µm
  • Difference-frequency generation (DFG) in the mid-IR
  • Nonlinear frequency conversion across the 0.5–18 µm transparency range

Standard Sizes

Size Cut / orientation Surface / coating Mount
5 × 5 × 0.5 mm θ = 23°, φ = 42.7° Polished, uncoated Unmounted
5 × 5 × 1 mm θ = 23°, φ = 42.7° Polished, uncoated Unmounted
5 × 5 × 2 mm θ = 23°, φ = 42.7° Polished, uncoated Unmounted
5 × 5 × 3 mm θ = 23°, φ = 42.7° Polished, uncoated Unmounted
5 × 5 × 1 mm θ = 32.1°, φ = 12.7° Polished, uncoated Unmounted
5 × 5 × 2 mm θ = 32.1°, φ = 12.7° Polished, uncoated Unmounted
5.8 × 6.1 × 17.7 mm θ = 22.7°, φ = 30°, Type I Polished, uncoated Unmounted
6 × 6 × 10 mm θ = 27°, φ = 42.7° Blank Unmounted
7 × 7 × 10.5 mm θ = 26°, φ = 42.7°, Type I Blank Unmounted
10 × 10 × 4.95 mm θ = 25.2°, φ = 42.7°, Type I Blank Unmounted

Availability of individual sizes changes; custom sizes, cut angles and coatings are available on request.

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Model: WQ-NLC-BGGSE · Custom sizes, orientations and coatings on request — contact WaveQuanta for a quote and lead time.

Chemical Formula BaGa2GeSe6
Transparency Range 0.5–18 µm
Nonlinear Coefficient d11 = 66 ± 15 pm/V
Optical Damage Threshold 110 MW/cm²
Dimension Tolerance (W ±0.1 mm) × (H ±0.1 mm) × (L +1 mm/−0.5 mm)
Clear Aperture > 90% central area
Flatness λ/8 @ 633 nm (T ≥ 1 mm)
Surface Quality 60-40 scratch-dig (after coating)
Parallelism Better than 30″
Perpendicularity 10′
Orientation Accuracy < 30″
Specification Sheet PDF — Download
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ZGP Crystal
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WQ-NLC-ZGP
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