Nd:YAG
Nd:YAG (Neodimium Doped
Yttrium Aluminum Garnet) is well-known laser crystal for solid-state crystal
material. It is used almost in all types of solid-state lasers systems by means
of the following properties:
High Gain, Low Threshold,
High Efficiency.
Low Loss at 1.06
mm, High Optical Quality.
Good Mechanical and Thermal
Properties.
Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with TEM00
mode.
Physical
and Optical
Properties:
|
Chemical
Formula |
Nd:Y3Al5O12
|
|
Structure |
Cubic
|
|
Cell parameter |
12.01Å
|
|
Melting
point |
1970
oC |
|
Density |
4.5g/cm3 |
|
Reflective Index |
1.82 |
|
Thermal
Expansion Coefficient |
7.8x10-6
/K <111> |
|
Thermal
Conductivity (W/m/K) |
14W/m/K,
20º C
10.5W/m/K, 100º C |
|
Mohs
hardness |
8.5 |
|
Stimulated Emission Cross Section |
2.8x10-19
cm-2
|
|
Relaxation Time of Terminal Lasing Level |
30 ns |
|
Radiation Lifetime |
550 m s |
|
Spontaneous Fluorescence |
230 m s
|
|
Linewidth |
0.6 nm |
|
Polarized Emission |
Unpolarized |
|
Loss
Coefficient |
0.003 cm-1
@ 1064nm |
Specifications:
|
Dopant |
1+/-0.1atm% |
|
Orientation |
<111>
crystalline direction |
|
Wavefront distortion |
l/8
per inch @ 633 nm |
|
Extinction Ratio |
>28dB |
|
Dimension Tolerances |
Diameter:
±0.025 mm , Length: ±0.5 mm |
|
Surface
quality |
10/5
Scratch / Dig per MIL-O-1380A |
|
Parallelism |
< 10 arc
seconds |
|
Perpendicularity |
< 5 arc
minutes |
|
Clear
Aperture |
>90%
|
|
Flatness |
<l/10
@ 633 nm |
|
Chamfer |
<0.1 mm
x 45º |
|
Barrel
Finish |
50-80
micro-inch (RMS) |
|
Anti-Reflection Coating |
R <
0.20% @ 1064 nm per surface. Damage threshold over 1GW/cm2@ 1064nm, 10 ns
and 10 Hz. |
|
HR
Coating |
R>99.8%
@ 1064nm and R<5% @ 808nm |
|