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Co²⁺ /ZnS Crystal

POC-OC-122482-Co²⁺/ZnS Crystal

  • Broad tunability for mid-IR laser systems (1.5–4.0 µm range).
  • High absorption and emission cross-sections, enabling efficient laser performance.
  • Excellent durability and thermal stability for demanding applications.
  • Suitable for high-power laser systems and medical devices.
  • Precise optical performance with customizable coating options.

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

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General Description

Co²⁺/ZnS crystals are a unique class of doped materials that exhibit remarkable optical and physical properties. These crystals are optimized for mid-infrared (mid-IR) applications, offering wide tunability in the 1.5–4.0 µm wavelength range. Doping zinc sulfide (ZnS) with cobalt ions introduces strong absorption and emission characteristics, making it a superior gain medium for various laser applications. With excellent mechanical properties and thermal stability, Co²⁺/ZnS is highly durable and resistant to environmental degradation, ensuring longevity and consistent performance. These crystals are compatible with advanced laser technologies and are suitable for both continuous-wave (CW) and pulsed laser operations.

General Applications and Examples

  1. Mid-IR Laser Systems:
    Co²⁺/ZnS crystals are widely used in mid-IR laser systems, especially in high-power and tunable laser configurations for material processing and industrial applications.
  2. Medical Applications:
    These crystals are ideal for laser surgery and therapeutic devices operating in the mid-IR spectrum, where high absorption by water and soft tissues ensures precise and effective procedures.
  3. Remote Sensing and Spectroscopy:
    Co²⁺/ZnS crystals serve as gain media in laser systems used for environmental monitoring, remote sensing, and gas detection, owing to their ability to operate in the mid-infrared atmospheric transmission windows.
  4. Research Applications:
    In scientific research, these crystals are used to develop novel laser systems and investigate optical properties for advanced photonics research.
  5. Optical Parametric Oscillators (OPOs):
    Co²⁺/ZnS is commonly utilized in OPOs to generate mid-IR radiation for use in spectroscopy, bioimaging, and industrial diagnostics.

Chemical and Structural Properties

PropertyValue
Chemical FormulaZnS with Co²⁺ doping
Density4.09 g/cm³
Thermal Conductivity~27 W·m⁻¹·K⁻¹
Melting Point~1700°C
Hardness~3.5 (Moh’s scale)
Crystal StructureCubic
Refractive Index~2.3
Orientation<111>, <110>, <100>
Cleavage Plane<111>

Optical Properties

PropertyValue
Transparency Range0.4–12 µm
Emission Wavelength Range1.5–4.0 µm
Absorption Cross-SectionHigh
Emission Cross-SectionHigh
Pump Wavelength Range~0.9–1.2 µm
Laser Damage Threshold>500 MW/cm²

Standard Fabrication Specifications

SpecificationValue
Dimensional Tolerance±0.05 mm
Surface Quality40-20 (scratch-dig rating)
Surface Flatnessλ/8 @ 632.8 nm
Parallelism<30 arcsec
Bevel<0.25 × 45°
Diameter RangeUp to 100 mm
Thickness Range1–10 mm

Spectrum Transmission Curve

The transmission spectrum of Co²⁺/ZnS crystal demonstrates high transparency over a broad wavelength range, particularly in the mid-IR region (0.4–12 µm). This allows for efficient operation in laser and optical systems. Detailed graphs showcasing transmission curves can be provided upon request.

Coating Specification

  • Anti-Reflection Coating: Customized for 1.5–4.0 µm with reflectance <0.5%.
  • Protective Coatings: Enhance resistance to environmental damage and mechanical wear.
  • Specialized Coatings: Tailored coatings available for specific wavelengths and 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.
Product Dimensions Price (USD)
Co²⁺/ZnS Laser Rods 10–50 mm length $1,000–$5,000
Co²⁺/ZnS Optical Windows 20–100 mm diameter $1,500–$8,000
Co²⁺/ZnS Gain Mediums Custom dimensions $3,000–$15,000
Customization Options Available on request Contact for quote

POC-OC-122482-Co²⁺ ZnS Crystal

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