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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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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 and Examples

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.
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 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.
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 Request Quote

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