Neodymium Doped Yttrium AIuminum Garnet (Nd: YAG) Crystal
Nd: YAG crystal is the most widely used solid-state laser material today. Now, we are able to stably supply quantity of Nd: YAG rods with high optical homogeneity, consistent performance, high processing accuracy and on time delivery.
1. Basic Properties (1.0 atm% Nd doped)
| Chemical Formula | Nd:Y3Al5O12 |
| Crystal Structure | Cubic |
| Lattice Constants | 12.01 Å |
| Concentration | ~ 1.2 x 1020 cm-3 |
| Melting Point | 1970 oC |
| 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 oC |
| Thermal Conductivity | 14 W/m /K @20 oC, 10.5 W /m /K @100 oC. |
| 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 |
2. Standard Products specification
Dopant Concentration (atomic %): 0.9%~ 1.1%
Orientation: <111> crystalline direction (±5o)
Wavefront distortion:l/8 per inch, measured by a double-pass interferometer @ 633 nm
Extinction Ratio:
Rods with diameter from 3 mm to 6.35 mm and with length to 100 mm:>30dB
Rods with diameter from 7 mm to 10 mm and with length to 100 mm:>28dB
Dimension Tolerances
Rods with diameter: ±0.025 mm (±0.001"), Length: ±0.5 mm (±0.02")
Barrel Finish:50 80 micro-inch (RMS) , grooved rod barrel are also available
Ends Finish:
Surface Figure: <l/10 @ 633 nm
Parallelism: < 10 arc seconds
Surface quality:< 5 arc minutes
Clear Aperture: > 10/5 Scratch / Dig per MIL-O-1380A
chamfer:<0.1 mm @ 45°
clear Aperture: extend over the entire faces to the chamfered edges
Anti-Reflection Coating:
Single layer MgF2 coating with high damage threshold for high power laser operation. Reflectivity R < 0.25% @ 1064 nm per surface. Damage threshold over 750 MW/cm2@ 1064nm, 10 ns and 10 HZ.
High-Reflection Coating:
Standard HR coating with R>99.8% @ 1064nm and R<5% @ 808nm can be performed in WTS. Other HR coatings, such as HR @ 1064/532 nm, HR @ 946nm, HR 1319 nm and other wavelengths are also available.
Standard products in-stock:
The standard Nd: YAG laser rod with dimension of f3x5 mm and f4x50 mm with AR or HR- coating for Diode Pumped Solid State Lasers (DPSS) are ready for immediate delivery. For more information about standard Nd: YAG rods please refer to page 62 of Diode Pumped Laser Optics Kits.