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Cr⁴⁺:YAG passive Q-switch

Cr⁴⁺:YAG is an excellent passive Q-switch crystal for 0.8 to 1.2 µm lasers such as Nd:YAG, Yb:YAG laser. Cr⁴⁺:YAG is chemically stable, durable, UV resistant, good thermal conductivity and high damage threshold. Cr⁴⁺:YAG can also be used as a laser crystal tuable at 1340 - 1580nm.

Advantages of Cr4+:YAG vs active acousto-optic and electro-optic Q-switch:

- No high voltage power supply needed
- Compact diffusion bonding available
- Higher reliability & longer lifetime
- Lower cost OEM components

Properties of Cr⁴⁺:YAG Crystal

Chemical Formula:

Cr⁴⁺Y₃Al₅O₁₂

Crystal Structure:

Cubic Garnet

Lattice Constants:

12.01Å

Melting Point:

1970°C

Density:

4.56 g/cm³

Mohs Hardness:

8.5

Specific Heat:

0.59 J/g.cm³

Modulus of Elasticity:

310 Gpa

Young's Modulus:

3.17X104 Kg/mm²

Poisson Ratio:

0.3 (est.)

Tensile Strength:

0.13~0.26 GPa

Thermal Expansion Coefficient:

7.8 x 10^-6/K [111], 0-250°C

Thermal Conductivity:

12.13 W/m /K

Cr:YAG Optical Properties

Refractive Index:

1.82 @1064 nm

Lasing Wavelength:

1340 – 1580nm

Emission state absorption cross section:

8.2 x 10^-19 cm²

Base state absorption cross section:

4.3 x 10^-18 cm²

Flouresence Lifetime:

3.4 μs

Sellmeier equation( λ in μm):

n²=2.08745+1.2081 λ²/(λ²-0.02119 )+17.2049 λ²/(λ²-1404.45)

General Specifications of Yb:YAG Laser Crystal

1) Orientation:

<111>, <110>, <100> crystalline direction (+/-0.5°)

2) Wavefront Distortion:

λ/8 per inch

3) Surface quality:

10/5 Scratch/Dig

4) Parallelism:

10 arc seconds

5) Perpendicularity:

5 arc minutes

6) Surface flatness:

λ/10 at 633 nm

7) Clear aperture:

Central 95%

8) Chamfer:

0.15mm @45°

9) Damage threshold:

>1GW/cm² ns pulse

10) Dopant Level:

0.5 mol% ~ 3 mol%

i. Cr⁴⁺:YAG crystal

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Cr4+:YAG passive Q-switch