AdvatechUK

Optical Properties

Units

Value

Optical Transmission

µm

1.3 - 1.6

Doping Concentration

mol%

0.03 - 0.65

Initial Transmission

%

5 - 95

Transmission/Transparency Range

nm

155 - 3200

 Optical Homogeneity (δn)

cm¹

 ~ 10‾⁶

Refractive Index (n)


1.6 - 1.75

 Absorption Coefficient @1064nm

cm¹

0.001

Physical / Thermal Properties

Units

Value

 Chemical Formula


Co:MgAl2O4

 Crystal Symmetry/Structure


Cubic

 Space Group



 Point Group



Melting Point

ºC

2105

 Thermal Expansion Coeff. @20ºC

 10‾⁶/ºC

7.33

Thermal Conductivity Coeff. @20ºC

W/m/ºK

17

 Specific Heat Capacity

 J/g K

TBA

 Density  

g/cm³

3.58

 Mohs Hardness


8

 Optical Damage Threshold @1064nm,1ns

MW/cm²

500

 Co:MALO / Co:Spinel Crystal - Availability




                      

  








Co:MgAl2O4 (known as both Co:MALO or Co:Spinel) - a spinel crystal doped with Cobalt - is a recently

developed material which has been proven to be a very effective passive Q-switch in lasers emitting in the

range 1.2 - 1.6µm.  It is widely used in eye-safe  Er:Glass lasers, (1.54µm) but also proven with laser

operating at 1.44µm and 1.34µm wavelengths. Co:MALO (Co:Spinel) has a high absorption cross  section which permits Q-switching of Er:Glass laser (both flash-lamp and diode-laser pumped), without intra-cavity focusing, Negligible excited-state absorption results in high contrast of Q-switch, i.e. the ratio of initial (small signal) to saturated absorption is higher than 10.


Co:MALO crystal strengths include:



Co:MALO crystal applications include:




 Co:MALO Crystal Properties


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 Co:MALO (Co:Spinel) Passive Q-Switch Crystals


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Further Reading / Publications (Click for links)


Passive Q-switch

Co:Spinal - Wikipedia

Co:MALO - Details - Refractive Index

Development and saturation investifgation of Co:MALO saturable absorber.