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AgGaSe2 Crystal

POC-OC-122425-AgGaSe2 Crystal

  1. Broad Transmission Range: Operates from 0.73 µm to 18.3 µm, ideal for mid-IR and far-IR applications.
  2. High Nonlinear Coefficient: Efficient for SHG, DFG, OPO, and other nonlinear optical processes with d_eff = 33 pm/V at 10.6 µm.
  3. Low Absorption and High Transparency: Excellent performance with low absorption at key wavelengths.
  4. High Thermal and Damage Threshold: Withstands high laser intensities with >10 MW/cm² damage threshold at 10.6 µm.
  5. Versatile Applications: Suitable for CO₂ lasers, solid-state lasers, and tunable OPO systems.

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General Description

Silver Gallium Selenide (AgGaSe₂) is a nonlinear optical crystal with a wide transparency range of 0.73–18.3 µm, making it indispensable for mid-infrared and far-infrared optical systems. Known for its exceptional nonlinear optical coefficients (d_eff = 33 pm/V at 10.6 µm), AgGaSe₂ is commonly used in frequency conversion processes, including second-harmonic generation (SHG), optical parametric oscillation (OPO), and difference frequency generation (DFG).

With low absorption, high damage thresholds, and precise phase-matching capabilities, AgGaSe₂ is a critical component for CO₂ lasers, tunable laser sources, and infrared spectroscopy systems. Its Sellmeier equations ensure accurate refractive index calculations, allowing efficient design of nonlinear optical systems.

General Applications and Examples

AgGaSe₂ crystals are versatile and widely used in high-performance nonlinear optical systems. Below are some of the key applications:

  1. Frequency Conversion:
  • Efficient SHG, DFG, and SFG processes for IR and mid-IR wavelengths.
  • Example: Used for generating mid-IR wavelengths from CO and CO₂ laser systems in industrial and scientific research.
  1. Optical Parametric Oscillators (OPOs):
  • AgGaSe2 Crystal Enables tunable wavelength generation from 4.0 to 18.3 µm.
  • Example: AgGaSe₂-based OPOs are applied in environmental gas sensing and medical diagnostics.
  1. Mid-IR Lasers:
  • AgGaSe2 Crystal Enhances the functionality of CO₂ and CO lasers for high-precision cutting, engraving, and spectroscopy.
  • Example: Used in industrial laser systems for cutting and material processing.
  1. Spectroscopy and Sensing:
  • Facilitates mid-IR spectroscopy for material and biomedical analysis.
  • Example: Ideal for infrared imaging and detection systems in research labs.
  1. Quantum Optics:
  • Supports advanced quantum systems requiring mid-IR photon generation and manipulation.
  • Example:  AgGaSe2 CrystalUsed in secure quantum communication systems and IR photon detectors.

Chemical and Structural Properties

Property Value
Chemical Formula AgGaSe₂
Crystal Structure Tetragonal, 42m
Lattice Parameters a = 5.992 Å, c = 10.8803 Å
Density 5.7 g/cm³
Mohs Hardness 3.35
Melting Point 851 °C
Transparency Range 0.73 µm–18.3 µm
Nonlinear Coefficients d_eff = 33 pm/V at 10.6 µm
Thermal Conductivity 1.4 W/m·K
Thermal Expansion Coefficient 19.8 × 10⁻⁶/°C

Optical and Nonlinear Optical Properties

Property Value
Nonlinear Process SHG, DFG, SFG, and OPO
Refractive Indices (10.6 µm) nₒ = 2.5917, nₑ = 2.5585
Absorption Coefficient <0.05 cm⁻¹ at 1.064 µm; <0.02 cm⁻¹ at 10.6 µm
Laser Damage Threshold >10 MW/cm² (150 ns pulses at 10.6 µm)
Sellmeier Equations n² = 6.6792 + 0.4598/(λ² – 0.2122) – 0.00126λ²
n² = 6.8507 + 0.4297/(λ² – 0.1584) – 0.00125λ²

Standard Fabrication Specifications

Specification Value
Dimensions 5 × 5 × 1 mm (standard)
Surface Flatness Lambda/6 @ 632.8 nm
Parallelism < 30 arc seconds
Perpendicularity < 10 arc minutes
Surface Quality 60-40 Scratch-Dig

Spectrum Transmission Curve

The spectrum transmission range of AgGaSe₂ is characterized by high transparency between 0.73 and 18.3 µm. The crystal shows minimal losses across this range, making it suitable for mid-IR and far-IR applications.

Key Characteristics:

  • Peak Transmission: Between 3 µm and 12 µm.
  • Lower Transparency: Slight absorption below 0.73 µm and above 18 µm.

(Note: Graphical data can be generated or requested from POC’s technical team.)

POC-AgGaSe2 Crystal Spectrum Transmission Curve

Coating Specification

  • Broadband AR Coating: BBAR at 1.7-2.7 µm and 5–18 µm
  • Custom Coatings: 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.
Product Code Dimensions (mm) Coating Price (USD)
AGSE-01 2 × 2 × 1 BBAR @ 1.7–2.7 µm Request Quote
AGSE-02 5 × 5 × 1 BBAR @ 5–18 µm Request Quote
AGSE-03 10 × 10 × 2 BBAR @ 1.7–18 µm Request Quote
Custom-AGSE Customizable Customizable Request Quote

POC-OC-122425-AgGaSe2 Crystal

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