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Polycrystalline Diamond Crystal

POC-OC-122505-Optical Grade Polycrystalline Diamond Crystal

  • Excellent optical transparency across UV, visible, and infrared wavelengths.
  • High thermal conductivity for efficient heat dissipation in high-power applications.
  • Exceptional mechanical strength and resistance to chemical corrosion.
  • Low optical absorption and scattering for improved laser performance.
  • Reliable performance in extreme environments with refractive index ~2.38 and transmission >99% with coating.

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General Description

Polycrystalline Diamond Crystal, produced using the Chemical Vapor Deposition (CVD) technique, is a robust synthetic diamond material known for its superior optical, thermal, and mechanical properties. It features outstanding transparency over ultraviolet (UV), visible, and infrared (IR) wavelengths, making it ideal for high-power laser systems and optical components. Its grain boundary structure ensures excellent heat resistance and chemical stability, outperforming traditional optical materials such as ZnSe. These crystals are characterized by low absorption loss and high refractive index, enabling efficient energy utilization. With high damage thresholds, they are particularly suited for demanding industrial laser applications, aerospace optics, and spectroscopic systems.

General Application and Examples

  • Polycrystalline Diamond Crystal High-Power Laser Systems: Used in cutting, welding, and drilling systems where high durability and low absorption are critical.
  • Infrared Optics: Effective in spectrometers, imaging, and other IR optical systems.
  • Aerospace and Defense: Ideal for missile guidance and reconnaissance optics due to their durability and radiation resistance.
  • Industrial Coating Windows: Provide stable and reliable protection for optical systems in extreme conditions.
  • Biomedical Optics: Effective in advanced diagnostic equipment due to high transparency and biocompatibility.

For example:

  • Polycrystalline diamond windows used in high-power CO2 lasers outperform ZnSe counterparts due to reduced scattering and higher mechanical reliability.
  • Large-diameter diamond optical windows (>100 mm) are deployed in industrial-grade cutting systems for superior transmission efficiency.

Chemical and Structural Properties

PropertyValue
Chemical FormulaDiamond (C)
Density3.5 g/cm³
Thermal Conductivity2200 W/mK (25°C)
Refractive Index2.38
Melting Point~4000°C
Hardness (Mohs Scale)10
Grain SizeFine (<2 μm)
Transmission Range0.25 μm to 10.6 μm
Absorption Coefficient (10.6 μm)0.04–0.07 cm^-1

Optical Properties

ParameterValue
Transmission Range250 nm – 10.6 μm
Refractive Index (10.6 μm)2.38
Laser Damage Threshold>100 MW/cm² (10 ns, 10 Hz)
Scattering LossNegligible (<0.1%)
Absorption Coefficient (10.6 μm)0.04–0.07 cm^-1

Standard Fabrication Specifications

ParameterValue
Clear Aperture>90% of diameter
Thickness Tolerance±0.05 mm
Surface Quality20-10 (Scratch-Dig)
Parallelism<10 arc seconds
Flatnessλ/10 @ 632.8 nm
Maximum DiameterUp to 150 mm
Coating OptionsAR/AR @ 10.6 μm

Spectrum Transmission Curve

Polycrystalline Diamond Crystals exhibit high transmittance (>98%) across a broad spectrum, from ultraviolet to far-infrared, when enhanced coatings are applied. This property ensures maximum optical performance in applications like IR spectrometry and laser systems.

Coating Specification

  • Coatings: Anti-reflective (AR) coatings for 10.6 μm.
  • Typical Materials: High durability dielectric materials for enhanced laser damage resistance.
  • Transmission: >99% with AR coatings.
  • 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.
Face DimensionsThicknessCoatingSKUPrice (USD)
20 x 20 mm1.0 mmAR/AR @ 10.6 μm8001850
25 x 25 mm1.0 mmAR/AR @ 10.6 μm8002950
30 x 30 mm1.5 mmAR/AR @ 10.6 μm80031050
Custom DimensionsOn requestCustom CoatingsN/AContact POC

POC-OC-122505-Optical Grade Polycrystalline Diamond Crystal

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