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BaGa2GeSe6 Crystal

POC-OC-122419-BaGa2GeSe6 Crystal

  • Broad transparency range from 0.5 μm to 18 μm.
  • Large nonlinear coefficient of approximately 40 pm/V.
  • High chemical stability and resistance to thermal damage.
  • Ideal for high-power applications with a high damage threshold.
  • Low optical scattering properties, enabling superior performance in frequency conversion.

Customizable Components Available for This Material to Meet Your Specific Needs!

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General Description

BaGa2GeSe6 Crystal, often abbreviated as BGSe Crystal, is a high-performance nonlinear optical material renowned for its broad transmission range (0.5–18 μm), large nonlinear optical coefficient (~40 pm/V), and excellent thermal and chemical stability. This crystal is capable of achieving efficient frequency conversion processes, including second harmonic generation, sum-frequency mixing, and optical parametric amplification.

The crystal’s exceptional damage threshold (with a melting point of 880°C) and low optical scattering make it suitable for high-power applications such as Nd:YAG laser pumping and mid-infrared frequency conversion. BaGa2GeSe6 also supports low-dispersion and high-durability processing, making it an excellent material for advanced photonics applications. Its unique chemical stability allows for easy cutting and polishing, enabling custom fabrication to meet user-specific requirements

General Applications and Examples

BaGa2GeSe6 Crystals are indispensable in a variety of high-performance photonics and optical systems. Key applications include:

  1. Mid-Infrared Laser Systems:
    With a wide transmission range and high optical clarity, BaGa2GeSe6 is well-suited for mid-IR laser systems, enabling precision applications in spectroscopy, defense, and biomedical imaging.
  2. Nonlinear Optical Frequency Conversion:
    Its high nonlinear optical coefficient (~40 pm/V) makes it ideal for second harmonic generation (SHG), difference frequency generation (DFG), and optical parametric oscillation (OPO) systems for producing mid- and far-infrared laser outputs.
  3. CO and CO2 Laser Systems:
    The crystal’s low optical losses and high damage threshold make it perfect for frequency doubling and mixing of CO and CO2 laser emissions, providing efficient wavelength conversion in high-power applications.
  4. Infrared Lidar and Remote Sensing:
    BaGa2GeSe6’s transparency and low absorption in the IR spectrum support accurate remote sensing and lidar technologies.
  5. Advanced Research:
    BaGa2GeSe6 Crystals enable cutting-edge research in nonlinear optics and photonics, offering a highly stable platform for developing new IR optical devices.

Chemical and Structural Properties

PropertyValue
Chemical FormulaBaGa2GeSe6
Transparency Range0.5–18 μm
Space Group42 mm
Bandgap Energy2.38 eV
Mohs Hardnessa-cut: 380 kg/mm², c-cut: 394 kg/mm²
Density5.2 g/cm³
Melting Point880°C

Optical and Nonlinear Optical Properties

PropertyValue
Transparency Range0.5–18 μm
Refractive Index (1064 nm)n = 2.7
Nonlinear Coefficient (pm/V)~40
Absorption Coefficient< 0.05 cm⁻¹ (1064 nm)
Laser Damage Threshold> 1.5 J/cm² (1064 nm, 15 ns, 1 Hz)

Standard Fabrication Specification

SpecificationValue
Orientation Accuracy± 0.5°
Clear Aperture> 90%
Surface Quality (Scratch/Dig)40-20
Flatnessλ/6 at 633 nm
Parallelism< 30 arc sec
Perpendicularity< 10 arc min
Surface Flatness Tolerance± 0.1 mm
Length Tolerance± 0.1 mm (1–10 mm)
± 0.5 mm (> 10 mm)

Spectrum Transmission Curve

Spectrum transmission curves can be provided upon request, showcasing superior transparency in the range of 0.5–18 μm

Coating Specification

  • AR Coatings: Available for 3–5 μm and 8–12 μm ranges.
  • Dual-Band Coatings: Custom coatings designed for specific laser wavelengths.
  • Customization: Specialized coatings available for extended applications upon request.
  • Adhesion Test: Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test: In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test: Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test: Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing: Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test: After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
Face Dimensions (mm)Length (mm)Orientation (Theta/Phi)CoatingApplicationPrice (USD)
5 x 5100°/0°AR @ 3–5 μmMid-IR spectroscopyRequest
10 x 10150°/0°AR @ 8–12 μmOPO/OPA systemsRequest
CustomCustomCustomCustomCustomRequest

POC-OC-122419-BaGa2GeSe6 Crystal

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