Nd:YAG
Nd:YAG is the earliest and most famous laser host crystal. Since it combines great advantages in many basic properties, Nd:YAG is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.
Advantages Of Nd:YAG
• High gain;
• Low threshold;
• High efficiency;
• Low loss at 1064nm;
• Good thermal conductivity and thermal shock characteristics;
• Mechanical strength;
• High optical quality;
• Material characteristics that allow for various modes of operation (CW, pulsed,Q-switched, mode locked).
Basic Properties
|
Chemical Formula
|
Y3Al5O12
|
|
Crystal Structure
|
Cubic
|
|
Lattice Constant
|
12.01Å
|
|
Melting Point
|
1970℃
|
|
Density
|
4.5g/cm3
|
|
Reflective Index
|
1.82
|
|
Thermal Expansion Coefficient
|
7.8x10-6/K<111>,0 - 250 ℃
|
|
Thermal Conductivity
|
14W/m/K, 20℃
10.5W/m/K, 100℃
|
|
Mohs hardness
|
8.5
|
|
Stimulated Emission Cross Section
|
2.8x10-19cm-2
|
|
Loss Coefficient
|
0.003 cm-1 @ 1064nm
|
|
Linewidth
|
0.6 nm
|
|
Radiative Lifetime
|
550 μs
|
Capability
| Attribute |
Commercial
|
High Precision
|
|
| Dopant Concentration | 0.4atm% - 1.1atm% | ||
| Orientation |
±0.5°
|
±0.5°
|
|
| Wavefront Distortion |
λ/8
|
λ/10
|
|
| Extinction Ratio |
28dB
|
30dB
|
|
| Dimension Tolerance |
Nd:YAG Rod:Dia±0.025, L±0.25mm
Nd:YAG slab: ±0.01mm
|
Nd:YAG Rod:Dia±0.025, L±0.25mm
Nd:YAG slab: ±0.01mm
|
|
| Ends Finish |
Surface Figure
|
λ/8
|
End finish
|
|
Surface Quality
|
20-10 scratch and dig
|
10-50 scratch and dig
|
|
|
Perpendicularity
|
15'
|
5'
|
|
