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HgGa2S4 Crystal

POC-OC-122421-HgGa2S4 Crystal

  • Wide transparency range: 0.55–13 μm.
  • High nonlinear optical coefficient: d36 approximately 1.8 times that of AgGaS2.
  • Exceptional damage threshold: 60 MW/cm² (1064 nm, 10 ns).
  • Negative uniaxial crystal with no > ne configuration.
  • Ideal for nonlinear optical applications such as OPO and OPA.

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

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Material General Description of  HgGa2S4 Crystal 

HgGa2S4 is a highly efficient nonlinear optical crystal with an exceptional nonlinear coefficient (d36), approximately 1.8 times that of AgGaS2. With a broad transparency range of 0.55–13 μm, it is particularly well-suited for mid-IR and near-IR applications, including optical parametric oscillation (OPO) and amplification (OPA). The crystal demonstrates excellent damage threshold properties and is chemically stable, making it ideal for high-power laser systems. Its broad wavelength tuning range makes it a competitive option alongside other crystals such as AgGaS2, ZnGeP2, and GaSe.

General Applications and Examples of HgGa2S4 Crystal 

HgGa2S4 Crystals are widely utilized in advanced photonics and laser technologies. Specific examples include:

  1. Laser Frequency Conversion:
    • Effective in optical parametric oscillators (OPO) and optical parametric amplifiers (OPA).
    • Supports broad wavelength tuning, enabling frequency conversion in high-power laser systems.
  2. Spectroscopic Analysis:
    • Used in mid-IR spectroscopy for environmental sensing and atmospheric studies.
  3. Medical Imaging and Biophotonics:
    • Provides accurate and efficient imaging in medical diagnostics.
  4. High-Power Lasers:
    • Suited for defense applications and laser material processing due to its damage threshold.
  5. Research and Development:
    • Extensively used in the study of nonlinear optical effects for high-energy applications.

Chemical and Structural Properties

Property

Value

Transparency Range

0.55–13 μm

Bandgap Energy

2.34 eV

Density

4.95 g/cm³

Mohs Hardness

3–3.5

Crystal Configuration

Negative Uniaxial (no > ne)

Refractive Indices

See table below

Optical and Nonlinear Optical Properties

Property

Value

Transparency Range

0.55–13 μm

Nonlinear Coefficient (d36)

1.8 × d36 of AgGaS2

Refractive Indices (no, ne)

See below

Damage Threshold

60 MW/cm² (1064 nm, 10 ns)

Refractive Indices (no and ne):

  • no = 2.6592, ne = 2.5979 @ 0.5495 μm
  • no = 2.5796, ne = 2.5264 @ 0.6500 μm
  • no = 2.4774, ne = 2.4324 @ 1.0760 μm
  • no = 2.4386, ne = 2.3979 @ 3.5400 μm
  • no = 2.3690, ne = 2.3290 @ 11.000 μm

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 for HgGa2S4 Crystals can be provided upon request, highlighting its broad transmission properties and efficiency across IR ranges

Coating Specification:

  • AR Coatings: Optimized for mid-IR wavelengths (0.8–1.2 μm, 3–5 μm, and 8–12 μm).
  • Customized Coatings: Available upon request for specific wavelength applications.
  • 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 manufacturing and supplying high-quality HgGa2S4 Crystals tailored to meet the needs of various industries. Our capabilities include:

  • Customized crystal growth and fabrication services.
  • High-precision polishing and coating for optimal optical performance.
  • Comprehensive quality control for consistent results.

Standard Products

Face Dimensions (mm)

Length (mm)

Orientation (Theta/Phi)

Coating

Application

Price (USD)

10 × 10

10

0°/0°

AR @ 3–5 μm

Mid-IR spectroscopy

Request

20 × 20

20

0°/0°

AR @ 8–12 μm

Frequency conversion

Request

Custom

Custom

Custom

Custom

Custom

Request

POC-OC-122421-HgGa2S4 Crystal

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