Cr4+:YAG is an excellent passive Q-switch or saturable absorber crystal of choice for 1μm Nd lasers.

.... Advantages of Cr4+:YAG Crystals
....Providing high power laser pulses without electro-optic Q-switches
More robust and stable than dyes or color centers
High damage threshold

.... Specifications

Orientation

[100] or [111] within 5°

Initial absorption coefficience

0.5～6cm-1 @1064nm

Initial transmission

5%~95%@1064nm

Sizes

Diameter:3～12mm
H×W:3×3~12×12mm

Dimensional tolerances

Diameter:+0.00/-0.05mm,H&W:±0.5mm

Barrel finish

Ground Finish 400# Grit

Parallelism

≤30"

Flatness

λ/8@632.8nm

Surface quality

20-10(MIL-O-13830A)

AR coating reflectivity

≤0.25% (@1064nm)

.... Physical and Chemical Properties

Crystal Structure

Cubic

Lattice Parameters

12.01 Å

Melting Point

1970℃

Moh Hardness

8.5

Density

4.56±0.04g/cm3

Specific Heat (0-20)

0.59J/g.cm3

Modulus of Elasticity

310GPa

Young's Modulus

3.17×104Kg/mm2

Poisson Ratio

0.3(est.)

Tensile Strength

0.13~0.26GPa

Thermal Expansion Coefficient

[100]Direction:8.2×10-6/K(0~250℃)

[110]Direction:7.7×10-6/K(0~250℃)

[111]Direction:7.8×10-6/K(0~250℃)

Thermal Conductivity

14W/m/K(@20℃)

10.5W/m/K(@100℃)

Thermal Optical Coefficient (dn/dT)

7.3×10-6/K

Thermal Shock Resistance

790W/m

Solubility

Water: Insoluble;
Common Acids: Slightly