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cr yag
cr yag

Cr4+: YAG Laser Crystals

Cr4+:YAG (Y3Al5O12) crystal is ideal for passive Q-switch operation of Nd:YAG and other Nd3+ or Yb3+ doped laser crystals in the wavelength range of 900 nm to 1200 nm. 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. A remarkable feature of Cr4+:YAG is the high damage threshold of >10 J/cm2@1064 nm, 10 ns. Its absorption band extends from 900 nm to 1200 nm and peaks around 1060 nm with a very large absorption cross-section.

Applications of Cr4+: YAG Laser Crystals


  • Passively Q-switched lasers for laser rangefinders, LIDAR, and LIBS systems

  • Laser systems where short pulses are required


Advantages of Cr4+: YAG Laser Crystals


  • High chemical stability and reliability

  • Easy to operate

  • Long lifetime and good thermal conductivity


Specifications of Cr4+: YAG Laser Crystals


Orientation:

<100>or<110>

Initial absorption coefficient

0.1~8.5cm-1@1064nm

Initial transmission

3%~98%

Wavefront Distortion:

λ/8per inch @ 632.8 nm

Dimension Tolerances:

rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm

Surface Quality:

20/10 Scratch/Dig MIL-O-1380A

Parallelism:

< 10″

Perpendicularity:

< 10′

Clear Aperture:

> 90%

Surface Flatness:

< λ/10 @ 632.8 nm

Chamfer:

< 0.1 mm @ 45deg.

Size

Upon customer request

Coating

AR/HR/PR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use


Basic Properties of Cr4+:YAG Crystal


Chemical Formula

Cr4+:Y3Al5O12

Crystal Structure

Cubic

Mohs Scale of Mineral Hardness

8.5

Melting Point

1970 °C

Density, g/cm3

4.55

Coefficient of Thermal Conductivity @ 25°C, W x cm-1x °K-1

0.14

Coefficient of Thermal Expansion

8.2 x 10^-6/ ℃<100>

Young's Modulus

7.7x 10^6<100>

Thermal Shock Resistance

790 Wm-1


Related Passive Q-switch Crystals
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