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.
|
