Nd:YAG
Nd:YAG crystal is the most widely used solid-state laser material today. It has been used in the 'micro/mini' 'DPSS' (Diode Pumped Solid State' laser system to get high quality Red, Green or Blue laser output in which the blue laser of Nd:YAG crystal has higher efficiency and more easy to realizes than Nd:YVO4 crystal blue laser. Nd:YAG crystal was also widely used in the military, scientific, medical and industrial laser systems, high performance scientific laser systems, laser therapy, cosmetology systems, laser marking, laser drilling and other laser material processing systems. Especially, Nd:YAG crystal is the best laser material for the high power, high energy, and Q-switched pulse laser systems. The very wide applications of Nd:YAG crystal in various laser system is because its outstanding performance in physics and mechanics.
Advantages of Nd:YAG crystals
Capabilities:
| Nd dopant: | 0.6 ~ 1.3 atm% |
| Diameter: | 3 ~ 14mm |
| Length: | 1 ~ 160mm |
| Orientation: | <111> or <100> within 5° |
| Dimensional Tolerance: | +/-0.1mm |
| Wavefront Distortion: | <λ/8 at 633nm |
| Surface Quality: | 20/10 |
| Parallelism: | < 10 arc seconds |
| Perpendicularity: | < 5 arc minutes |
| Surface Flatness: | <λ/10 at 633nm |
| Clear Aperture: | Central 95% |
| Chamfer: | 0.15x45° |
| Coating: | 1.AR@1064nm R<0.2% 2.AR@1064nm R< 0.2% & HT@808nm T>95% 3.HR@1064nm R>99.8% & HT@808nm T>95% 4.HR@1064nm R>99.8% & HR@532nm R>99% & HT@808nm T>95% |
Properties:
| Chemical Formula | Nd:Y3A15O12 |
| Crystal Structure | Cubic |
| Lattice Constants | 12.01Ä |
| Concentration | ~ 1.2 x 1020 cm-3 |
| Melting Point | 1970 °C |
| Density | 4.56 g/cm3 |
| Mohs Hardness | 8.5 |
| Refractive Index | 1.82 |
| Thermal Expansion Coefficient | 7.8 x 10-6 /K [111], 0 - 250 °C |
| Thermal Conductivity | 14 W/m /K @20 °C, 10.5 W /m /K @100 °C. |
Lasing Wavelength
1064 nm
Stimulated Emission Cross Section
2.8x10-19 cm-2
Relaxation Time of Terminal Lasing Level
30 ns
Radiative Lifetime
550 ms
Spontaneous Fluorescence
230 ms
Loss Coefficient
0.003 cm-1 @ 1064 nm
Effective Emission Cross Section
2.8 x 10-19 cm2
Pump Wavelength
807.5 nm
Absorption band at pump wavelength
1 nm
Linewidth
0.6 nm
Polarized Emission
Unpolarized
Thermal Birefringence
High