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BaGa4S7 Crystal

POC-OC-122420-BaGa4S7 Crystal

  • Wide transparency range: 0.35–13.7 μm.
  • High nonlinear optical coefficient: d33 = 12.7 pm/V.
  • Excellent chemical stability and low optical absorption.
  • High damage threshold for intense laser applications.
  • Ideal for frequency conversion processes like OPA, DFG, and SFG.

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

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Material General Description of  BaGa4S7 Crystal 

BaGa4S7 Crystal, also known as BGS Crystal, is a transparent pale-yellow crystal with exceptional nonlinear optical (NLO) properties. This crystal is distinguished by its broad transparency range from 0.35 μm to 13.7 μm, a wide bandgap of 3.54 eV, and a high damage threshold. BaGa4S7 is chemically stable and exhibits a high nonlinear optical coefficient of d33 = 12.7 pm/V.

Uniquely, BaGa4S7 has minimal two-photon absorption at 1 μm, making it highly efficient for 1064 nm Nd:YAG laser pumping. This crystal is widely used in nonlinear frequency conversion processes, including optical parametric oscillation (OPO) and second-harmonic generation (SHG). Additionally, it is compatible with widely available 1030 fs lasers for advanced photonics applications.

 

General Applications and Examples BaGa4S7 Crystal 

BaGa4S7 Crystals are highly versatile and find applications in a wide range of industries. Some key examples include:

  1. Laser Frequency Conversion: BaGa4S7 is highly suitable for generating mid-IR wavelengths through frequency conversion processes such as OPA, DFG, and SFG, providing efficient laser wavelength tuning.
  2. Nd:YAG Laser Pumping: The crystal is an excellent medium for 1064 nm Nd:YAG laser pumping, enabling efficient parametric oscillation and higher-order harmonic generation.
  3. Biomedical Applications: With its high optical clarity and low absorption losses, BaGa4S7 supports biomedical imaging and diagnostics in the mid-IR region.
  4. Spectroscopy: BaGa4S7 Crystals are used for advanced spectroscopic studies, especially in atmospheric sensing and material characterization.
  5. Defense and Lidar: The crystal’s broad transparency range and high damage threshold make it ideal for lidar technologies and defense applications in high-power laser systems.

Chemical and Structural Properties

Property

Value

Transparency Range

0.35–13.7 μm

Nonlinear Coefficient

d33 = 12.7 pm/V

Density

3.95 g/cm³

Surface Quality (Scratch/Dig)

40-20

Bandgap Energy

3.54 eV

Melting Point

1000°C

Optical and Nonlinear Optical Properties

Property

Value

Transparency Range

0.35–13.7 μm

Nonlinear Coefficient

d33 = 12.7 pm/V

Laser Damage Threshold

High

Surface Quality

40-20

Standard Fabrication Specifications

Specification

Value

Dimension Tolerance

±0.1 mm

Surface Quality (Scratch/Dig)

40-20

Flatness

λ/8 @ 632.8 nm

Parallelism

<30 arc sec

Perpendicularity

<10 arc min

Edge Bevel

<0.2 mm × 45°

Spectrum Transmission Curve:

Spectrum transmission curves can be provided upon request, showcasing superior transparency in the range of 0.35–13.7 μm

Coating Specification:

  • AR Coatings: Anti-reflective coatings optimized for the 0.8–1.2 μm and 3–5 μm ranges.
  • Dual-Band Coatings: Customized for specific mid-IR laser wavelengths.
  • Customization: Available for high-power 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) is committed to delivering advanced BaGa4S7 Crystals tailored for high-performance photonics applications. POC ensures:

  • High-precision cutting and polishing tailored to customer needs.
  • Stringent quality control for optical and surface properties.
  • Comprehensive customization for scientific and industrial applications.

Standard Products

Face Dimensions (mm)

Length (mm)

Orientation (Theta/Phi)

Coating

Application

Price (USD)

5 × 5

10

0°/0°

AR @ 3–5 μm

Mid-IR spectroscopy

Request

10 × 10

15

0°/0°

AR @ 8–12 μm

Frequency conversion

Request

Custom

Custom

Custom

Custom

Custom

Request

POC-OC-122420-BaGa4S7 Crystal

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