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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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Material General Description of  BaGa2GeSe6 Crystal 

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 Crystal 

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

Property

Value

Chemical Formula

BaGa2GeSe6

Transparency Range

0.5–18 μm

Space Group

42 mm

Bandgap Energy

2.38 eV

Mohs Hardness

a-cut: 380 kg/mm², c-cut: 394 kg/mm²

Density

5.2 g/cm³

Melting Point

880°C

Optical and Nonlinear Optical Properties

Property

Value

Transparency Range

0.5–18 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 Specifications

Specification

Value

Orientation Accuracy

± 0.5°

Clear Aperture

> 90%

Surface Quality (Scratch/Dig)

40-20

Flatness

λ/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.

 

POC Strength and Capabilities

Photonics On Crystals (POC) specializes in the design and delivery of advanced BaGa2GeSe6 Crystals for infrared and mid-infrared optical systems. POC offers:

  • Customization for specific wavelength and orientation requirements.
  • Precision fabrication and polishing services with stringent quality control.
  • Solutions tailored for both research and industrial applications.

With advanced manufacturing expertise, POC ensures the highest standards of reliability and efficiency in crystal production.

Standard Products

Face Dimensions (mm)

Length (mm)

Orientation (Theta/Phi)

Coating

Application

Price (USD)

5 x 5

10

0°/0°

AR @ 3–5 μm

Mid-IR spectroscopy

Request

10 x 10

15

0°/0°

AR @ 8–12 μm

OPO/OPA systems

Request

Custom

Custom

Custom

Custom

Custom

Request

POC-OC-122419-BaGa2GeSe6 Crystal

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