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Passivel Q-Switched Crystal Co：Spinel （Co2+:MgAl2O4）Crystal

Q-Switched Crystal Co： Spinel （Co2+:MgAl2O4）Crystal

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Description

Q-Switched Crystal Co： Spinel （Co2+:MgAl2O4）Crystal

Cobalt doped magnesium aluminate spinel (CO: mgal2o3, Co: spinel) allows the generation of nanosecond short pulses with peak power near the eye safety wavelength of 1.5um, which is very suitable for telemetry applications. MgAl2O4 doped with CO2 + has a wide absorption spectrum in the wavelength range of 1200 ~ 1600nm, indicating that CO2 + ions replace tetrahedrally coordinated Mg2 + ions in MgAl2O4 lattice. Passive Q-switching of solid-state saturable absorber solid-state laser is a very attractive Q-switching technology, because it can develop compact and low-cost nano and sub nanosecond pulse laser sources with a wide range of applications

Cobalt spinel – 1.5% for eye safety μ M wavelength solid-state laser for passive q-conversion saturated absorber, at 1.5 μ M laser emission is of great interest for some industrial applications. This is first due to the eye safety of 1.5 micron radiation. Other advantages of this wavelength are high transparency in atmospheric and fused silica waveguides, and the availability of sensitive room temperature photodetectors (GE and InGaAs photodiodes). All these make 1.5 μ M laser is very attractive in rangefinder, environmental sensing, telecommunications, surgery and other fields. The absorption peak of cobalt spinel is near 1520nm, which is the most commonly used eye safety laser. The absorption cross section at 1520nm is 3.5 × 2.8 at 10-19cm21331 × 10-19cm2, er, Yb glass and Q-switched crystals of Nd: gysgg, Nd: YAlO3.

Feature
Rare excitation absorption
Q-switch high constant
High absorption section
Long service life
Uniform cobalt distribution
Absorption bandwidth

Physical and chemical properties

chemical formula	Co2+:MgAl2O4
crystal structure	立方
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%

Material Specification

concentration	(0.05~0.35) wt%
absorption coefficient	0 ～ 7 cm-1
Ground state absorption cross section GSA (E-19 cm2)	2.8（±0.4）@1340nm
Excited state absorption cross section ESA (E-20 cm2)	2.0（±0.6）@1340nm
Ground state absorption cross section GSA (E-20 cm2)	3.5（±0.4）@1540nm
Excited state absorption cross section ESA (E-20 cm2)	1.0（±0.6）@1540nm
Working wavelength	1200 – 1600 nm
Final configuration	Flat/Flat
Figure of merit（FOM）	100~300
Coating	AR/AR@1540，R<0.2%;
Coating	AR/AR@1340，R<0.2%

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