Co Spinel Q Switch Crystals

Product Details


Description

Passive Q-switches or saturable absorbers generate high power laser pulses without the use of electro-optic Q-switches, thereby reducing the package size and eliminating a high voltage power supply. Co2+:MgAl2O4 is a relatively new material for passive Q-switching in lasers emitting from 1.2 to 1.6μm, in particular, for eye-safe 1.54μm Er:glass laser, but also works at 1.44μm and 1.34μm laser wavelengths. Spinel is a hard, stable crystal that polishes well. Cobalt substitutes readily for magnesium in the Spinel host without the need for additional charge compensation ions. High absorption cross section (3.5×10-19 cm2) permits Q-switching of Er:glass laser without intracavity focusing both with flash-lamp and diode laser pumping. Negligible excited-state absorption results in high contrast ratio of Q-switch, i.e. the ratio of initial (small signal) to saturated absorption is higher than 10.


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Absorption Spectrum of Co:Spinel crystal

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Absorption Spectrum of Co:Spinel crystal

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Transmission Spectrum of Co:Spinel crystal


Features

•  Suitable for 1540 nm eye-safe lasers

•  High absorption section

•  Negligible excited state absorption

•  High optical quality

•  Uniformly distributed Co

                                                     

Applications

•  Eye-safe 1540 nm Er:glass laser

•  1440 nm laser

•  1340 nm laser

•  Eye-safe laser range finder


Parameters

Property

Value

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

Specific Heat/ (J·g-1·K-1)

1.046

Thermal Expansion /(10-6 /°C@25°C ) 

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%


Specifications

Property

Value

Concentrations

(0.05~0.35) wt%

Absorption coefficient

0 ~ 7 cm-1

Ground-state absorption cross-section σGSA(E-19 cm2)

2.8(±0.4)@1340nm

Excited state absorption cross-section σESA (E-20 cm2)

2.0(±0.6)@1340nm

Ground-state absorption cross-section σGSA(E-20 cm2)

3.5(±0.4)@1540nm

Excited state absorption cross-section σESA (E-20 cm2)

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%


Polishing Specification

Property

Value

Orientation Tolerence

< 0.5°

Thickness/Diameter Tolerance

±0.05 mm

Surface Flatness

<λ/8@632 nm

Wavefront Distortion

<λ/4@632 nm

Surface Quality

10/5

Parallel

10〞

Perpendicular

Clear Aperture

>90%

Chamfer

<0.1×45°

Maximum dimensions

Dia(3-15)×(3-50)mm


Standard products

Initial transmission @1064nm

Dimensions,mm

Coatings

Surface Flatness

Surface Quality

(scratch/dig)

T0=30%

dia 5

AR≤0.2% @1340nm

Or

AR≤0.2% @1540nm

 

<λ/8@632 nm

10/5

3x3

5x5

T0=40%

dia 5

3x3

5x5

T0=50%

dia 5

3x3

5x5

T0=60%

dia 5

3x3

5x5

T0=70%

dia 5

3x3

5x5

T0=80%

dia 5

3x3

5x5

T0=85%

dia 5

3x3

5x5

T0=90%

dia 5

3x3

5x5

T0=95%

dia 5

3x3

5x5

T0=97%

dia 5

3x3

5x5


With Q Switch Crystals for sale, it is one of the leading manufacturers and supplies of good co spinel q switch crystals, welcome to buy and wholesale products at good price from our factory.

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