Nd:YAG Laser Crystal
Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG) laser crystal is the most early and mature laser material adopted by R&D, medical, industrial and military customers. It is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.
Advantages
1 ) High gain, Low threshold, High efficiency
2 ) Low loss at 1.06um, Good thermal conductivity and thermal shock characteristics
3 ) Mechanical strength, High optical quality
4 ) Material characteristics allow for various modes of operation (CW, pulsed, Q-switched, mode locked and cavity dumped.)
Specifications
Material | Nd:YAG |
Nd Dopant Level | 0.1- 2.5(+/-0.1)atm% |
Orientation | or |
Dimension | Diameter:1-50mm, Length:0.3-220mm(upon customer’s request) |
Diameter Tolerance | +0/-0.04mm |
Length Tolerance | +0.5/-0mm |
Wavefront Distortion | <λ/10 per inch@632.8nm |
Chamfer | <0.1mm@45° |
Damage Threshold | >750MW/cm2@1064nm 10ns 10HZ |
Clear Aperture | >95% |
Flatness | λ/10 per inch@632.8nm |
Scratch/Dig | 10-5 @MIL-0-13830A |
Barrel Finish | 50-80 micro-inch(RMS) |
Chips | <0.1mm |
Extinction Ratio | >30dB(depends on actual sizes ) |
Perpendicularity | <5 arc minutes |
Parallelism | <10 arc seconds |
Anti-Reflection Coating | R<0.15%@1064nm per surface |
High-Reflection Coating | Standard HR coating with R>99.8% @1064nm and R<5%@808nm |
Properties
Chemical Formula | Nd:Y3Al5O12 |
Crystal Structure | Cubic |
Lattice Constant | 12.01Å |
Melting Point | 1970° |
Rupture Stress | 1.3-2.6*103 kg/cm2 |
Density | 4.55g/cm3 |
Mohs Hardness | 8.5 |
Thermal Expansion Coefficient | [100] Orientation–8.2×10-6/oC (0-250oC) |
[110] Orientation–7.7×10-6/oC (0-250oC) | |
[111] Orientation–7.8×10-6/oC (0-250oC) | |
Laser Transition | 4F3/2 –> 4I11/2 |
Laser Wavelength | 1064nm |
Photon Energy | 1.86×10-19J |
Emission Linewidth | 4.5Å @1.064µm |
Stimulated Emission Cross Section | 2.7-8.8×10-19 cm2 @Nd 1at% |
Fluorescence Lifetime | 230µs |
Refractive Index | 1.8197 @1.064µm |