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DKDP Switch Crystal

POC-OC-122490-DKDP Switch Crystal

  • High optical transmission (>98%) across a wide wavelength range (200-2100 nm).
  • Exceptional electro-optic properties suitable for Q-switching and laser modulation.
  • High laser damage threshold (>750 MW/cm² at 1064 nm).
  • Low optical loss and excellent optical homogeneity.
  • Versatile applications in laser systems, including medical and industrial fields.

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

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General Description

DKDP (Potassium Dideuterium Phosphate) Switch Crystals, with the chemical formula KD₂PO₄, are widely recognized for their low optical losses, high extinction ratio, and superior electro-optic efficiency. These crystals are primarily used in electro-optic modulators, Q-switches, and frequency conversion systems. DKDP crystals feature excellent laser damage thresholds (>750 MW/cm²) and high transmission (>98%), making them ideal for low-repetition and high-energy laser applications. With a wide transparency range (200-2100 nm) and low absorption coefficient (0.006 cm⁻¹), DKDP crystals are a reliable choice for advanced laser technologies in industrial, medical, and research applications.

General Applications and Examples

DKDP Switch Crystals are primarily used in:

  • Electro-Optic Q-Switches: High-energy lasers for material processing and micromachining.
  • Frequency Conversion Systems: Second harmonic generation (SHG) and optical parametric oscillators (OPOs) for precision laser frequency doubling.
  • Laser Modulation: Pulse shaping and beam intensity modulation in research and medical laser systems.
  • Medical Lasers: Low-repetition lasers for non-invasive surgical and therapeutic applications.
  • Industrial Laser Systems: Cutting-edge laser technologies requiring precise beam control and frequency modulation.

For instance, in the field of laser eye surgery, DKDP Q-switch crystals are integral to high-precision laser scalpel systems. In industrial applications, they enhance productivity in micromachining by enabling efficient pulse shaping and beam energy modulation.

Chemical and Structural Properties

Property Value
Chemical Formula KD₂PO₄
Transparency Range 200-2100 nm
Nonlinear Coefficient d₃₆ = 0.4 pm/V
Electro-Optic Coefficient γ₄₁ = 8.8 pm/V, γ₆₃ = 25 pm/V
Half-Wave Voltage V = 2.98 kV @ 546 nm, 6.4 kV @ 1064 nm
Absorption Coefficient 0.006 cm⁻¹
Damage Threshold >750 MW/cm², 10 Hz, 10 ns @ 1064 nm

Optical Properties

Optical Property Value
Refractive Index (at 1064 nm) 1.490
Electro-Optic Ratio High extinction (>1000:1)
Laser Damage Threshold >750 MW/cm²
Optical Homogeneity High uniformity
Transparency Range 200-2100 nm

Standard Fabrication Specifications

Parameter Specification
Optical Aperture 3-15 mm (effective diameter 85%)
Wavefront Distortion <λ/8 @ 632.8 nm
Surface Quality 10-5 Scratch-Dig
Parallelism <1 arc minute
Flatness <λ/10 @ 632.8 nm
Damage Threshold >750 MW/cm² @ 1064 nm

Spectrum Transmission Curve

Spectrum transmission data can be provided upon request. Please contact Photonics On Crystals (POC) for additional details or consult the comprehensive product catalog for more information.

Coating Specification

  • AR Coating Range: 200-2100 nm
  • Typical Reflectance: <0.2%
  • Laser Damage Threshold: >750 MW/cm²

Customized coatings for specific wavelength ranges are 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 Option Price (USD)
DKDP-001 10x10x5 AR @ 1064 nm $1500
DKDP-002 15x15x10 AR @ 532 nm $1800
DKDP-Custom Customized Size Custom Coating Contact Us
Note: Prices are approximate and subject to change based on customization and volume orders.

POC-OC-122490-DKDP Switch Crystal

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