Computational model for operation of 2 mum co-doped Tm,Ho solid state lasers.
Computational model for operation of 2 mum co-doped Tm,Ho solid state lasers.
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DOI：
10.1364/oe.15.011903
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发表时间：
2007-09
期刊：
影响因子：
3.8
通讯作者：
O. Louchev;Y. Urata;N. Saito;S. Wada
中科院分区：
文献类型：
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作者：
O. Louchev;Y. Urata;N. Saito;S. Wada
建立了一个耦合8能级速率方程、TEM 00光束分布和复杂热耗散模型的Tm，Ho共掺固体激光器的计算模型。对Tm，Ho：YLF激光器产生约0.1J的调Q巨脉冲的模拟表明，约43%的785nm光二极管侧面泵浦能量直接转化为晶体内部的热量，而约45%是来自（3）F（4），（5）I（7），（3）H（4）和（3）H（5）能级的自发辐射。在水冷操作中，这种辐射在热边界层内被吸收，其中热传递由热传导主导。在高功率运行中，所产生的温度升高导致（i）巨脉冲能量的显着降低和（ii）热透镜。
A computational model for operation of co-doped Tm,Ho solid-state lasers is developed coupling (i) 8-level rate equations with (ii) TEM00 laser beam distribution, and (iii) complex heat dissipation model. Simulations done for Q-switched approximately 0.1 J giant pulse generation by Tm,Ho:YLF laser show that approximately 43% of the 785 nm light diode side-pumped energy is directly transformed into the heat inside the crystal, whereas approximately 45% is the spontaneously emitted radiation from (3)F(4), (5)I(7) , (3)H(4) and (3)H(5) levels. In water-cooled operation this radiation is absorbed inside the thermal boundary layer where the heat transfer is dominated by heat conduction. In high-power operation the resulting temperature increase is shown to lead to (i) significant decrease in giant pulse energy and (ii) thermal lensing.