|
Introduction
Nd:Ce:YAG is an excellent laser material
used for no-water cooling and miniature laser systems.
 Low threshold
Very high slope efficiency
Good anti-UV irradiation property
Good thermal stability
High optical quality
Basic Properties:
| Crystal Structure |
Cubic |
| Lattice Parameters |
12.01 Å |
| Melting Point |
1970 °C |
| Moh Hardness |
8.5 |
| Density |
4.56±0.04g/cm 3 |
| Specific Heat (0-20) |
0.59J/g.cm 3 |
| Modulus of Elasticity |
310GPa |
| Young's Modulus |
3.17X10 4 Kg/mm 2 |
| Poisson Ratio |
0.3(est.) |
| Tensile Strength |
0.13~0.26GPa |
| Thermal Expansion Coefficient
|
[100]Direction:8.2x10 -6 / °C (0~250
°C ) |
| [110]Direction:7.7x10 -6 / °C (0~250
°C ) |
| [111]Direction:7.8x10 -6 / °C (0~250
°C ) |
| Thermal Conductivity |
14W/m/K(@20 °C ) |
| 10.5W/m/K(@100 °C ) |
| Thermal Optical Coefficient (dn/dT)
|
7.3×10 -6 / °C |
| Thermal Shock Resistance |
790W/m |
The
Sellmeier equations (°C in µm for YAG):
n ^2 = 2.08745 + 1.2081 °C ^2 /(°C^ 2 - 0.02119 )+ 17.2049
°C ^2 /(°C ^2 - 1404.45 )
Optical
and Spectral Properties
| Dopant concentration |
Nd:1.1 ~ 1.4at%,Ce:0.05 ~ 0.1at% |
| Laser Transition |
4 F 3/2 --> 4 I 11/2 |
| Laser Wavelength |
1.064µm |
| Photon Energy |
1.86×10 -19 J@1.064µm |
| Emission Linewidth |
4.5Å @1.064µm |
| Emission Cross Section
(Nd1at%) |
2.7~8.8×10 -19 cm -2 |
| Fluorescence Lifetime (Nd1at%)
|
230µs |
| Index of Refraction |
1.8197@1064nm |
Ne:Ce:YAG Specifications:
| Orientation: |
<111> or <100]> crystalline
within 5° |
| Wavefront distortion : |
l /8 per inch @ 633 nm |
| Extinction Ratio: |
>25dB |
| Dimension Tolerances |
Rods with diameter: ±0.025 mm ,
Length: ±0.5 mm |
| Surface quality: |
10/5 Scratch / Digper MIL-O-1380A
|
| Parallelism: |
< 10 arc seconds |
| Perpendicularity: |
< 5 arc minutes |
| Flatness: |
< l /10
@ 633 nm |
| chamfer: |
<0.1 mm @ 45deg. |
| Barrel Finish: |
50-80 micro-inch (RMS) , |
| AR Coating Reflectivity |
< 0.25% |
Note: The other specification and dimension is available
too |
Laser Crystals