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Cr4+:Y3Al5O12 - Passive Q-switches or saturable absorbers provide high power laser pulses without electro-optic Q-switches, thereby reducing the package size and eliminating a high voltage power supply. Cr4+:YAG is more robust than dyes or color centers and is the material of choice for 1 um Nd lasers. 

 

Physical and Chemical Properties

Formula

Cr4+:Y3Al5O12

Crystal structure

cubic

Mohs hardness

8.5

Melting point:

1970 C

Density, g/cm3

4.55

Thermal conductivity at 25C

0.14 W x cm-1 x K-1

Thermal expansion coefficient

7.8 x 10-6/ ℃ <111>
8.2 x 10-6/ ℃ <100>
7.710-6/ ℃ <110>

Young's Modulus

3.17x104kg/mm2

Thermal Shock Resistance

790 Wm-1

 

Standard Specifications

Orientation:

<111>within 5 or <100>within 5

Flatness

< λ/10

Parallelism

≤ 30"

Perpendicularity

≤ 5 ′

Surface quality

20-10(MIL-O-13830A))

Wavelength:  

950 nm 1100nm

Initial transmittance:

5%~95%

Damage threshold

≥ 500MW/cm2

AR coating reflectivity

≤ 0.2% (@1064nm)

Size

Diameter:3 20mm 
H W:3 3
20 20mm

Dimensional tolerances 

Diameter: 0.00/-0.05", 
Length: 0.05"
 Chamfer: 0.07+0.005/-0.00" at 45

 
 Nd:YAG rod      Nd:YVO4       KTA        Er:YAG      (Nd, Ce):YAG        Yb:YAG

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