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Diffusion Bonded Crystal

POC-OC-122443-Diffusion Bonded Crystal

  • Significantly reduces thermal lensing effects for high-power laser applications.
  • Enhanced thermal stability and performance due to bonded crystal structure.
  • Combines undoped and laser crystals to optimize energy transfer and heat dissipation.
  • Supports multiple crystal combinations like YVO4 + Nd:YVO4, Cr:YAG + Nd:YAG, etc.
  • Available in diverse assembly configurations to meet custom requirements.

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

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Diffusion Bonded Crystal Material General Description

Diffusion Bonded Crystals are advanced composite materials made by fusing laser and undoped crystals using optical contact techniques under high-temperature bonding. This design minimizes thermal lensing effects caused by high-power laser operations and enhances the thermal conductivity and energy transfer efficiency of the laser medium. By integrating undoped crystals, the bonded crystal reduces heat accumulation and ensures consistent beam quality. Common combinations include YVO4 + Nd:YVO4 and Cr:YAG + Nd:YAG. These crystals are widely applied in lasers requiring high thermal stability and reliable performance under continuous operation.

The technology allows for a seamless fusion of different crystal types, preserving the optical and mechanical integrity of the final product. This bonding technique is critical in high-energy lasers used for precision applications like LIDAR systems, material processing, and medical devices.

 

Diffusion Bonded Crystal General Applications and Examples

Diffusion Bonded Crystals are essential in several advanced laser applications:

  • High-Power Solid-State Lasers: Used in industrial and scientific laser systems requiring high thermal management for continuous and pulsed operations.
  • LIDAR Systems: Employed in navigation and range-finding applications due to their superior optical performance and thermal stability.
  • Medical Devices: Utilized in high-precision laser systems for surgical and therapeutic applications.
  • Laser Material Processing: Ideal for cutting, welding, and engraving tasks due to enhanced energy transfer efficiency.
  • Scientific Research: Supports high-power experiments, including nonlinear optics and spectroscopy, by providing stable and reliable laser mediums.

Diffusion Bonded Crystal Examples:

  1. YVO4 + Nd:YVO4 + YVO4 Assembly: Enhances energy transfer efficiency and reduces thermal effects, making it suitable for diode-pumped solid-state lasers.
  2. Cr:YAG + Nd:YAG Combination: Offers passive Q-switching capabilities with excellent thermal properties, making it ideal for compact and portable laser systems.
  3. Custom Configurations: Tailored for specific applications like high-precision lasers used in three-dimensional imaging and material diagnostics.

Chemical and Structural Properties

Parameter

Value/Specification

Material Type

Laser crystal + Undoped crystal

Crystal Structure

Varies by type (e.g., YVO4, YAG)

Thermal Conductivity

Enhanced by undoped crystal

Thermal Expansion Coefficient

Low, dependent on crystal types

Bonding Technology

Optical contact and high-temperature bonding

Damage Threshold

High, suitable for high-power lasers

Optical, Laser and Nonlinear Optical Properties

Crystal Assembly

Application

Optical Property

YVO4 + Nd:YVO4 + YVO4

Diode-pumped solid-state lasers

High energy transfer, low thermal effects

Cr:YAG + Nd:YAG

Passive Q-switching applications

High thermal stability, excellent durability

YVO4 + YAG + Nd:YAG

Advanced solid-state laser systems

Efficient beam quality

Standard Fabrication Specifications

Parameter

Specification

Crystal Size

Customizable (based on assembly)

Surface Quality (Scratch/Dig)

10/5 or better

Flatness

λ/8 @633 nm

Wavefront Distortion

λ/4 @633 nm

Parallelism

< 20 arc sec

Perpendicularity

< 15 arc min

Chamfer

0.2 mm × 45°

Spectrum Transmission Curve:

Spectrum transmission curves may vary based on the specific crystal combinations. For detailed technical data, please contact POC.

Coating Specification:

 

  • Standard AR-Coating: Reflectivity < 0.2% at specified laser wavelengths.
  • Customized Coating Options: Available upon request for specific wavelength ranges.
  • High-Reflection Coatings (HR): Optimized for specific laser 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.

 

POC Strength and Capabilities

 

Photonics On Crystals (POC) specializes in the design and fabrication of Diffusion Bonded Crystals to meet diverse application needs. Our expertise includes:

  • Advanced bonding techniques ensuring high thermal and optical performance.
  • Customizable crystal configurations and coatings tailored to specific requirements.
  • High-precision manufacturing for superior beam quality and thermal management.
  • Comprehensive support and consultation for industrial and scientific applications.

Standard Products

Assembly Type

Crystal Combination

Dimensions

Application

Type (a)

YVO4 + Nd:YVO4 + YVO4

Customizable

Solid-state laser systems

Type (b)

Cr:YAG + Nd:YAG

Customizable

Passive Q-switching

Type (c)

YVO4 + YAG + Nd:YAG

Customizable

High-power lasers

Customization

Available upon request

Customizable

Contact POC for details

POC-OC-122443-Diffusion Bonded Crystal

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