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Nd:Ce:YAG is an excellent laser material used for no-water cooling and miniature laser systems. In double doped Nd:Ce:YAG crystal, Cerium is chosen as sensitizer for Nd3+ ions because of its strong absorption in UV spectral region at flash lamp pumping and efficient energy transfer to the Nd3+ excited state. As a result, thermal distortion in Nd: Ce:YAG is appreciably less and the output laser energy is greater than that in Nd:YAG at the same pumping. Therefore it is possible to realize high power lasers with good beam quality. Lasing wavelength at 1064 nm, laser damage threshold and thermal conductivity of the Nd:Ce:YAG crystals are the same as for Nd:YAG.
Nd:Ce:YAG Crystal Features:
- High efficiency
- Low threshold
- Good anti-violet radiation property
- Good thermal stability
- High optical quality
Nd:Ce:YAG Crystal Physical Properties:
|
Crystal Structure |
Cubic |
|
Lattice Parameters |
12.01 Å |
|
Melting Point |
1970 °C |
|
Moh Hardness |
8.5 |
|
Density |
4.56±0.04g/cm3 |
|
Specific Heat (0-20) |
0.59J/g.cm 3 |
|
Modulus of Elasticity |
310GPa |
|
Young's Modulus |
3.17 x 104 Kg/mm2 |
|
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 |
Nd:Ce:YAG Crystal Optical Properties:
|
Laser Transition |
4F3/2 -> 4I11/2 |
|
Laser Wavelength |
1064nm |
|
Photon Energy |
1.86×10-19J@1064nm |
|
Emission Linewidth |
4.5Å @1064nm |
|
Emission Cross Section(Nd1at%) |
2.7~8.8 ×10-19 cm2 |
|
Fluorescence Lifetime(Nd1at%) |
230µs |
|
Index of Refraction |
1.8197 @1064nm |
|
Sellemeier equation (λ in um) |
n2=2.08745+1.2081λ2/(λ2-0.02119)+17.2049λ2/(λ2-1404.45) |
Nd:Ce:YAG Standard Product Specifications:
|
Dopant concentration |
Nd:1.1 ~ 1.4at%, Ce:0.05 ~ 0.1at% |
|
Orientation |
<111> or <100> crystalline within 5° |
|
Wavefront distortion |
λ /8 @ 633 nm |
|
Extinction Ratio |
>25dB |
|
Rod Sizes |
Diameter:3～6mm, Length:40～80 mm |
|
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 |
|
Flatness |
< λ /10 @ 633 nm |
|
Chamfer |
<0.1 mm @ 45deg. |
|
Barrel Finish |
Ground Finish: 400# Grit |
|
AR Coating Reflectivity |
< 0.25% |