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Cr4+:YAG is an excellent passive Q-switch or saturable absorber crystal of choice for 1¦Ìm Nd lasers.
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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
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Material and specifications
| Orientation |
[100] or [111] within 5¡ã |
| Wavefront distortion |
¡Ü0.125¦Ë/inch |
| Initial absoption coefficience: |
0.5¡«6cm-1 @1064nm |
| Initial transmission |
5%~95%@1064nm |
| Sizes |
Diameter:3¡«12mm
H¡ÁW:3¡Á3~12¡Á12mm |
| Dimensional tolerances |
Diameter+0.000"/-0.002",H&W¡À0.002" |
| Barrel finish |
Ground Finish400# Grit |
| Parallelism |
¡Ü30" |
| Flatness |
¦Ë/10 |
| Surface quality |
20-10(MIL-O-13830A) |
| Damage threshold |
¡Ý500MW/cm2 |
| AR coating reflectivity |
¡Ü0.25% (@1064nm) |
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Physical and Chemical Properties
| Crystal Structure |
Cubic |
| Lattice Parameters |
12.01 Å |
| Melting Point |
1970¡æ |
| Moh Hardness |
8.5 |
| Density |
4.56¡À0.04g/cm3 |
| Specific Heat (0-20) |
0.59J/g.cm3 |
| Modulus of Elasticity |
310GPa |
| Young's Modulus |
3.17¡Á104Kg/mm2 |
| (est.)Poisson Ratio |
0.3(est.) |
| Tensile Strength |
0.13~0.26GPa |
| Thermal Expansion Coefficient |
[100]Direction:8.2¡Á10-6/¡æ(0~250¡æ) |
| [110]Direction:7.7¡Á10-6/¡æ(0~250¡æ) |
| [111]Direction:7.8¡Á10-6/¡æ(0~250¡æ) |
| Thermal Conductivity |
14W/m/K(@20¡æ) |
| 10.5W/m/K(@100¡æ) |
| Thermal Optical Coefficient (dn/dT) |
7.3¡Á10-6/¡æ |
| Thermal Shock
Resistance |
790W/m |
| Solubility |
Water: Insoluble;
Common Acids: Slightly |
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