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Co:Spinel Crystal

POC-OC-122493-Co:Spinel Crystal

  • Exceptional performance for passive Q-switching in the 1.3 μm – 1.6 μm wavelength range.
  • High laser-induced damage threshold and low optical losses.
  • Excellent absorption cross-section enabling effective Q-switch operation.
  • Negligible excited-state absorption, ensuring high contrast operation.
  • Custom fabrication available upon request.

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

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Co:Spinel Crystal  Material General Description

Co:Spinel Crystal (Cobalt-doped Magnesium Aluminate) is a versatile and reliable material for passive Q-switching in laser systems. It exhibits low optical losses and a high laser-induced damage threshold, making it an ideal choice for lasers emitting in the wavelength range of 1.3 μm to 1.6 μm. Its high absorption cross-section enables precise Q-switching without the need for intracavity focusing, providing a robust solution for Er:Glass lasers and other laser systems. With a negligible excited-state absorption, Co:Spinel ensures high contrast between initial and saturated absorption states, supporting efficient energy modulation.

This crystal has a cubic structure, high thermal stability, and excellent mechanical durability, making it well-suited for demanding applications. POC offers tailored specifications to meet various laser requirements

 

General Applications

Co:Spinel Crystal is used in the following applications:

  • Passive Q-switching for Er:Glass lasers operating at 1.54 μm.
  • Laser pulse modulation in both flash-lamp and diode-pumped systems.
  • High-power solid-state laser systems requiring stable and efficient energy modulation.
  • Military and medical lasers, including rangefinders and medical imaging systems.
  • Laser-based communication systems, where reliability and precision are critical.

Co:Spinel Crystal  Example Use Case:
In Er:Glass laser systems, Co:Spinel Crystal  high absorption cross-section enables precise Q-switching, resulting in efficient and repeatable pulse generation. Its durability ensures stable operation even in high-power environments, making it a preferred choice for demanding industrial and defense applications.

Chemical and Structural Properties

Property

Value

Crystal Structure

Cubic

Density

3.58 g/cm³

Thermal Expansion Coefficient

6.14 × 10^-6 K^-1

Thermal Conductivity

17 W/m·K

Mohs Hardness

8

Refractive Index

1.6 – 1.75

Optical, Laser and Nonlinear Optical Properties

Parameter

Value

Wavelength Range

1.3 μm – 1.6 μm

Initial Transmission (T₀)

50%-99% @ 1535 nm

Ground-State Absorption (σg)

3.5 × 10^-19 cm² @ 1.54 μm

Excited-State Absorption (σe)

0.1 × 10^-19 cm² @ 1.54 μm

Recovery Time (T₃)

220–350 ns

Laser-Induced Damage Threshold

>8 J/cm² @ 1535 nm, 10 ns

Standard Fabrication Specifications

Specification

Value

Dimensions (Face)

3 × 3 mm, 5 × 5 mm

Clear Aperture

>90%

Surface Flatness

λ/4 @ 632.8 nm

Wavefront Distortion

λ/8 @ 632.8 nm

Parallelism

<20 arcseconds

Perpendicularity Error

<5 arcminutes

Surface Roughness

<0.1 nm @ 45°

Spectrum Transmission Curve:

Spectral transmission curves for Co:Spinel Crystal indicate low absorption losses and high transmission efficiency in the 1.3 μm to 1.6 μm range. The data supports its use in high-performance laser systems requiring passive Q-switching.

POC-Co Spinel Crystal Spectrum Absorption and emission Curve

Coating Specification:

 

  • Standard Coating: AR/AR @ 1535 nm.
  • Other Coatings: Custom coatings 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.

POC Strength and Capabilities

 

  • Customization: POC offers tailored specifications, including size, coating, and transmission properties.
  • Expertise in Fabrication: Advanced fabrication techniques ensure precision and quality.
  • High-Quality Standards: Rigorous quality checks ensure durability and performance.
  • Technical Support: POC provides comprehensive customer support and consultation services.

Standard Products

Face Dimensions

Initial Transmission

Coating

SKU

Price (USD)

3 × 3 mm

80% @ 1535 nm

AR/AR

7331

$370

5 × 5 mm

97% @ 1535 nm

AR/AR

7343

$420

Custom Sizes

Custom Transmission

Custom

Custom

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