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Laser Crystal
Nd:YAG
Although Nd:YAG was invented in the Sixties last century, it has been and is still the most commonly used solid-state crystal material. Nd:YAG crystals are wildly used in all types of solid-state lasers systems-frequency-doubled continuous wave, high-energy Q-switched, and so forth.
Its good fluorescent lifetime thermal conductivity and physical strengths makes it suitable for high power lamp pumped laser.
| Physical and Optical Properties | |
|---|---|
| Chemical Formula | Nd:Y3 Al5 O12 |
| Crystal Structure | Cubic |
| Lattice Constants | 12.01? |
| Concentration | ~ 1.2 x 1020 cm -3 |
| Melting Point | 1970 °C |
| Density | 4.56 g/cm 3 |
| 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 cm 2 |
| Pump Wavelength | 807.5 nm |
| Absorption band at pump wavelength | 1 nm |
| Linewidth | 0.6 nm |
| Polarized Emission | Unpolarized |
| Thermal Birefringence | High |
| Capabilities Include: | |
| Nd dopant concentration | 0.5---1.2 atm% tolerance within 10% of concentration. |
| Diameter | 3 ~ 14mm |
| Length | 1 ~ 160mm |
| Typical Specification and Tolerance: | |
| Orientation | <111> crystalline direction (+/-0.5°C) |
| Wavefront Distortion | <λ/10 at 632.8nm for 3 ~7mm <λ/8 per inch at 632.8nm for >=7mm |
| Surface quality | better than 20/10 Scratch/Dig per MIL-O-1380A |
| Parallelism | < 10 arc seconds |
| Perpendicularity | < 5 arc minutes |
| Surface flatness | < λ/10 at 632.8nm |
| Clear aperture | Central 95% |
| Chamfer | 0.15x45° |
| Damage threshold | over 15J/cm 2 (rods without coating) over 700 MW/cm 2 (coating) |
| Coatings | AR@1064nm,R < 0.1%; AR@1064nm,R < 0.1%; HT@808nm,T > 95%; HR@1064nm,R < 99.8%; HT@808nm,T > 95%; HR@1064nm,R < 99.8%; HT@808nm,T > 95%;HR@532nm,R > 99%; |
Notes:
To inquiry or order a finished Nd:YAG laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Nd-dopant concentration, size, and coating. For special request, please specify specification in details for evaluation and fabrication.