Nd:YAG (neodymium-doped yttrium aluminium garnet; Nd:Y3Al5O12) is a crystal that is used as a lasing medium for solid-state lasers. The dopant, triply ionized neodymium, typically replaces yttrium in the crystal structure of the yttrium aluminium garnet (YAG), since they are of similar size. Generally the crystalline host is doped with around 1% neodymium by atomic percent.
Nd:YAG absorbs mostly in the bands between 730–760 nm and 790–820 nm.At low current densities krypton flashlamps have higher output in those bands than do the more common xenon lamps, which produce more light at around 900 nm. The former are therefore more efficient for pumping Nd:YAG lasers. Specifications:
| Nd Dopant Concentration: | 0.5-1.2 atm%tolerance within 10% of concentration |
| Diameter: | 3 ~ 14mm |
| Length(L): | 0.5~160mm |
| Orientation: | <111> crystalline direction (+/-0.5℃) |
| Flatness: | <λ/8 @ 633nm |
| Smooth Finish: | 20/10 |
| Parallelism: | ＜30" |
| Perpendicularity: | ＜10' |
| Wavefront Distortion: | < λ/8 @ 633nm |
| Clear Aperture: | > 90% |
| Coating: | According to customer request |
| 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 |