Nd:Ce:YAG レーザ結晶
In double doped Nd:Ce:YAG crystals Cerium are 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.
Advantages of Nd:Ce:YAG Crystals
- High efficiency
- Low threshold
- Good anti-violet radiation property
- Good thermal stability
- High optical quality
Optical and Spectral Properties of Nd:Ce:YAG Crystal
| Laser Transition | 4F3/2 → 4I11/2 |
| Laser Wavelength | 1.064µm |
| Photon Energy | 1.86×10-19J@1.064µm |
| Emission Linewidth | 4.5Å @1.064µm |
| Emission Cross Section (Nd1at%) | 2.7～8.8×10-19cm-2 |
| Fluorescence Lifetime (Nd1at%) | 230µs |
| Index of Refraction | 1.8197@1064nm |
Specifications of Nd:Ce:YAG crystal from CASTECH
| Dopant concentration | Nd:1.1～1.4at%,Ce:0.05～0.1at% |
| Wavefront distortion | ≤ 0.2λ/inch |
| Extinction Ratio | ≥28 dB |
| Rod Sizes | Diameter:3～6mm,Length:40～80mm Upon request of customer |
| Dimensional Tolerances | Diameter+0.000"/-0.002",Length ±0.02" |
| Barrel Finish | Ground Finish: 400# Grit |
| Parallelism | ≤10" |
| Perpendicularity | ≤5′ |
| Flatness | λ/10 |
| Surface quality | 10-5(MIL-PRF-13830B) |
| Chamfer | 0.006"±0.002" at 45°± 5° |
| AR coating reflectivity | ≤ 0.25% (@1064nm) |
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