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AgGaGeS4- AGGS Crystal

POC-OC-122416-AgGaGeS4 Crystal

  • Wide transmission range: 0.5 – 11.5 µm.
  • Low absorption coefficient: <0.05 cm⁻¹ at 1064 nm.
  • High nonlinear coefficient: d31 = 15 pm/V.
  • High laser damage threshold: >1.2 J/cm² at 1064 nm.
  • Ideal for high-power mid-IR tunable laser applications.

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

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Material General Description of  AgGaGeS4 Crystal 

AgGaGeS4 Crystal is a cutting-edge mid-IR nonlinear optical crystal with excellent transmission properties, low absorption coefficients, and a high laser damage threshold. Its wide transparency range (0.5–11.5 µm) and nonlinear optical coefficients make it a superior alternative to traditional crystals in mid-IR laser systems. The material is particularly suitable for Nd:YAG laser-pumped systems and high-power mid-IR parametric oscillators. AgGaGeS4 crystals are available in annealed and as-grown forms, optimized for specific applications in infrared optics

 

General Applications and Examples of  AgGaGeS4 Crystal 

  1. Mid-Infrared Optical Systems: AgGaGeS4 is utilized in mid-IR tunable laser systems for applications like spectroscopy, medical diagnostics, and material processing. Its wide transparency range enables high-efficiency frequency conversion in mid-IR regions.
  2. High-Power Lasers: With a high nonlinear coefficient and laser damage threshold, AgGaGeS4 supports high-power systems, including parametric oscillators and amplifiers.
  3. Laser Pumped Systems: The crystal is optimized for 1.06 µm Nd:YAG laser-pumped applications and can also be pumped with 0.8 µm Ti:Sapphire lasers, delivering efficient mid-IR outputs.
  4. Spectroscopy and Remote Sensing: The broad transparency range and low absorption coefficients make AgGaGeS4 a reliable choice for infrared spectroscopy, allowing precise chemical analysis and environmental monitoring.
  5. Industrial Applications: Common in laser cutting, welding, and mid-IR imaging systems, AgGaGeS4 ensures durability and efficiency in harsh industrial environments.

Chemical and Structural Properties

Property

Value

Chemical Formula

AgGaGeS4

Crystal Structure

Orthorhombic

Lattice Parameters

a = 1.05 nm, b = 0.76 nm

Density

4.5 g/cm³

Mohs Hardness

3

Melting Point

830 °C

Thermal Expansion Coefficients

αa = 7.8 × 10⁻⁶/K, αb = 8.1 × 10⁻⁶/K

Optical and Nonlinear Optical Properties

Property

Value

Transparency Range

0.5 – 11.5 µm

Absorption Coefficient

<0.05 cm⁻¹ at 1064 nm

Nonlinear Coefficient (d31)

15 pm/V

Refractive Indices

no = 2.56, ne = 2.73

Damage Threshold

>1.2 J/cm² at 1064 nm

Standard Fabrication Specifications

Specification

Value

Dimension Tolerance (mm)

±0.1

Surface Flatness

λ/8 @ 633 nm

Surface Quality (Scratch/Dig)

20/10 to MIL-PRF-13830B

Parallelism

<20 arc seconds

Perpendicularity

≤15 arc minutes

Clear Aperture

≥90% of the diameter

Coatings

AR coatings available

Laser Damage Threshold

>1.2 J/cm² at 1064 nm

Spectrum Transmission Curve:

(Spectrum transmission curves for AgGaGeS4 Crystal can be provided upon request, showcasing its transmission efficiency across the 0.5–11.5 µm range.)

Coating Specification:

  • Anti-Reflective (AR) Coating: Optimized for mid-IR wavelengths with a low reflectance of <0.2%.
  • Customized Coatings: Other coatings (e.g., BBAR, HR) are available upon request based on specific application needs.
  • 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 providing high-quality AgGaGeS4 crystals for industrial and scientific applications. Our expertise ensures precision growth, superior optical quality, and custom fabrication tailored to client specifications. Our crystals undergo rigorous testing for durability and performance, guaranteeing their reliability in high-power laser systems.

Standard Products

Product Code

Dimensions (mm)

Coating Type

Application

Price (USD)

AGGS-1010-AR

10 × 10 × 2

AR Coating

Mid-IR Laser Systems

Request

AGGS-2020-AR

20 × 20 × 5

AR Coating

Spectroscopy Applications

Request

Custom

Custom Sizes

Customized

Tailored for Specific Needs

Request

POC-OC-122416-AgGaGeS4 Crystal

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