Laser Crystals ------>> 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.
1) |
Nd Dopant Concentration: |
0.5-1.2 atm%tolerance within 10% of concentration |
2) |
Diameter: |
3 ~ 14mm |
3) |
Length: |
1~ 160mm |
Typical Specification and Tolerance:
1) |
Orientation: |
<111> crystalline direction (+/-0.5℃) |
2) |
Wavefront Distortion: |
<l/10 at 632.8nm for 3 ~ 7mm <l/8 per inch at 632.8nm for >=7mm |
3) |
Surface Quality: |
better than 20/10 Scratch/Dig per MIL-O-1380A |
4) |
Parallelism: |
< 10 arc seconds |
5) |
Perpendicularity: |
< 5 arc minutes |
6) |
Surface Flatness: |
<l/10 at 632.8nm |
7) |
Clear Aperture: |
Central 90% |
8) |
Chamfer: |
0.15x45o |
9) |
Damage Threshold: |
> 15J/cm2(uncoated ) > 700 MW/cm2(coated) |
10) |
Coatings: |
a)AR@1064nm, R<0.1%; b)AR@1064nm, R< 0.1%;HT@808nm, T>95%; c)HR@1064nm, R>99.8%; HT@808nm, T>95%; d)HR@1064nm, R>99.8%; HT@808nm, T>95%; HR@532nm, R>99%; |
 |
 |
 |
| coating 9-1 | coating 9-2 |
coating 9-3 |
| 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, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication. |
| Physical and Optical Properties |
| 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 |