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BaGa4Se7 BGSe --used

POC-OC-122418-BaGa4Se7 Crystal

  • Wide transmission range from 0.47 μm to 18 μm.
  • High nonlinear optical coefficient (dmax = 24.3 pm/V).
  • Excellent transparency with low absorption coefficients.
  • High damage threshold, suitable for high-power applications.
  • Ideal for mid-infrared applications, including spectroscopy and OPA/OPO systems.

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

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.Material General Description of BaGa4Se7 Crystal 

BaGa4Se7 Crystal, abbreviated as BGSe Crystal, is an advanced nonlinear infrared optical crystal characterized by its broad transmission range (0.47–18 μm) and high transparency. It exhibits a nonlinear coefficient approximately 2–3 times higher than AgGaS2 Crystals and a damage threshold roughly 3.7 times higher than traditional AgGaS2 materials. The crystal’s peak nonlinear coefficient, dmax, reaches up to 24.3 pm/V, making it highly efficient for frequency conversion and nonlinear optical applications.

BGSe Crystals are increasingly applied in areas such as biomedical spectroscopy, atmospheric sensing, and high-power mid-infrared optical parametric amplification (OPA) and oscillation (OPO) systems. With advanced optical clarity and damage resistance, BaGa4Se7 serves as one of the most promising materials for cutting-edge infrared applications requiring precise wavelength tuning and high-energy optical efficiency

 

General Applications and Examples of BaGa4Se7 Crystal 

BaGa4Se7 Crystals excel in several specialized fields due to their exceptional nonlinear optical and transmission properties:

  1. Biomedical Spectroscopy:
    BGSe Crystals enable highly accurate spectroscopic measurements in mid-infrared wavelengths, ideal for applications such as bio-molecular fingerprinting and non-invasive diagnostics.
  2. Atmospheric Sensing and Remote Monitoring:
    With a wide transparency range and low absorption coefficients, BGSe Crystals are crucial for atmospheric gas monitoring, including CO and trace element detection, via laser-based technologies.
  3. OPO and OPA Systems:
    These crystals are essential in optical parametric oscillators and amplifiers for mid-infrared wavelength generation, enabling fine-tuning between 3–5 μm and 8–14 μm.
  4. Defense and Aerospace:
    Advanced IR laser systems utilizing BGSe Crystals support high-energy military applications, including lidar and infrared countermeasure systems.
  5. Advanced Research in Photonics:
    BGSe Crystals are pivotal in developing next-generation high-energy infrared optical devices, making them indispensable in academic and industrial R&D settings.

Chemical and Structural Properties

Property

Value

Chemical Formula

BaGa4Se7

Crystal Structure

Orthorhombic

Lattice Parameters

a = 11.224 Å, b = 12.457 Å, c = 7.145 Å

Density

4.77 g/cm³

Mohs Hardness

3.5

Melting Point

998°C

Thermal Conductivity

1.6 W/m·K (at 300 K)

Transparency Range

0.47–18 μm

Absorption Coefficient

< 0.05 cm⁻¹ (at 1064 nm)

Damage Threshold

> 1.2 J/cm² (at 1064 nm)

Optical and Nonlinear Optical Properties

Property

Value

Transparency Range

0.47–18 μm

Refractive Indices (at 1064 nm)

no = 2.671, ne = 2.847

Nonlinear Coefficient (pm/V)

dmax = 24.3

Absorption Coefficient

< 0.05 cm⁻¹ (at 1064 nm)

Laser Damage Threshold

> 1.2 J/cm² (at 1064 nm)

Nonlinear Optical Efficiency

2–3 times that of AgGaS2

Standard Fabrication Specifications

Specification

Value

Orientation Accuracy

± 0.5°

Clear Aperture

> 90%

Surface Quality (Scratch/Dig)

40-20

Flatness

λ/8 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, illustrating high efficiency across the 0.47–18 μm range.)

Coating Specification:

  • AR Coatings: Anti-reflective coatings available for 3–5 μm and 8–12 μm ranges.
  • Dual-Band Coatings: Customized coatings designed for specific laser applications.
  • Customization: Coatings for extended infrared applications are available 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 designing and delivering BaGa4Se7 Crystals tailored for high-performance optical applications. With advanced manufacturing capabilities and strict quality control, POC ensures:

  • Customization to exact user specifications for orientation, size, and coating.
  • Rigorous testing for durability and optical clarity.
  • Support for both prototype development and large-scale production.

POC’s expertise in advanced infrared crystal manufacturing guarantees unparalleled reliability and precision for all photonics applications.

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-122418-BaGa4Se7 Crystal

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