Research Article
Finite Element Analysis of Thermal Effects in Diode End-Pumped Solid-State Lasers
Table 2
Parameters used in FEA calculations for crystals studied in this work.
| | | Nd:YAG | Nd:KGW | Yb:YAG |
| | Thermal conductivity W/mm°K | | | | | -component | 0.0103 | 2.8 × 10−3 | 0.014 | | -component | 0.0103 | 2.2 × 10−3 | 0.014 | | -component | 0.0103 | 3.5 × 10−3 | 0.014 | | Coefficient of thermal expansion 1/°K | | | | | -component | 4.0 × 10−6 | 4.0 × 10−3 | 7 × 10−6 | | -component | 4.0 × 10−6 | 3.5 × 10−3 | 7 × 10−6 | | -component | 4.0 × 10−6 | 8.6 × 10−3 | 7 × 10−6 | | Refractive index | 1.823 | 2.033 | 1.82 | | Temperature dependence of refractive index 1/°K | 9.86 × 10−6 | 4.0 × 10−7 | 9 × 10−6 | | Absorption coefficient (parallel polarization ) | 0.35 | 3.5 | 0.3 | | Absorption coefficient (perpendicular polarization ) | 0.35 | 3.5 | 0.3 | | Heat efficiency factor | 0.3 | 0.3 | 0.11 | | Pump efficiency | 0.8 | 0.8 | 1 | | Stimulated emission cross section (mm2) | | 3.8 × 10−17 | | | Spontaneous lifetime (µs) | 230 | 100 | 950 | | Pump laser spot size (µm) | 300 | 300 | 300 |
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