Co: Spinel

Cobalt spinel is a comprehensive Q-switching crystal product with excellent properties. It demonstrates a wide absorption band in the 1200~1600nm wavelength range, making it a passive Q-switch for solid-state lasers operating at the eye-safe wavelength of 1.5μm.

Classification:

Laser Crystals

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Detailed introduction

Cobalt Spinel (Co: Spinel), with the chemical formula Co₂₊: MgAl₂O₄, is a comprehensive Q-switching crystal product with excellent properties. Co₂₊: MgAl₂O₄ demonstrates a wide absorption band in the 1200~1600nm wavelength range, making it a passive Q-switch for solid-state lasers operating at the eye-safe wavelength of 1.5μm. Cobalt-doped magnesium aluminate spinel (Co: MgAl₂O₄) can produce short nanosecond pulses, with high peak power around the eye-safe wavelength of 1.5μm. Additionally, this wavelength is within the peak response band of InGaAs detectors, making 1.5μm lasers highly suitable for applications in range finders, environmental sensing, telecommunications, and more.

PRODUCT FEATURE

Wide Absorption Bandwidth from 1.2 to 1.6 micrometers.

High Damage Threshold

Good Thermal Stability

High Optical Quality

Mechanical and Chemical Stability

APPLICATIONS

Fiber Lasers that wavelength from 1.2 to 1.6 micrometers

Passive Q-switch in solid-state lasers

Medical and Cosmetic

Ultrafast lasers and nonlinear optical experiments

Laser radars, laser guidance, and electro-optical countermeasure systems

Absorption Spectrum

Emission Spectrum

Material properties
Concentration	0.05wt%~0.35wt%
Absorption coefficient	0 ～ 7 cm^-1
Ground-state absorption cross-section GSA(E^-19cm²)	2.8（±0.4）@1340nm
Excited state absorption cross-section ESA(E^-20cm²)	2.0（±0.6）@1340nm
Ground-state absorption cross-section GSA(E^-20cm²)	3.5（±0.4）@1540nm
Excited state absorption cross-section ESA(E^-20cm²)	1.0（±0.6）@1540nm
Working wavelength	1200~1600 nm
End Configuration	Flat/Flat
Figure of Merit(FOM)	100~300
Coatings	AR/AR@1540，R<0.2%; AR/AR@1340，R<0.2%

Physical and Chemical Properties
Chemical formula	Co₂₊:MgAl₂O₄
Crystal structure	Cubic
Lattice parameters	8.07Å
Density	3.62 g/cm³
Melting Point	2105°C
Refractive Index	n=1.6948 @1.54 μm
Thermal Conductivity/(W·cm^-1·K^-1@25°C)	0.033W
Thermal Expansion /（10^-6 /°C@25°C ）	1.046
Specific Heat/ (J·g^-1·K^-1)	5.9
Hardness (Mohs)	8.2
Extinction Ratio	25dB
Orientation	<100> or <111> < ±0.5°
Optical density	0.1~0.9
Damage Threshold	>500 MW/cm²
Doping concentration of Co₂₊	0.01-0.3 atm%