高功率激光片状放大器中自发辐射放大研究
Research of amplified spontaneous emission in high power slab laser amplifier
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摘要: 采用理论模拟和实验研究相结合的方法，研究了高功率激光片状放大器中的自发辐射放大(ASE)效应。建立了一套较完整的包含空间和时间的3维ASE模型，分析了不同电压、不同储能分布和不同泵浦时刻、不同增益长度积条件下ASE效应对放大器储能效率和小信号增益系数的影响。对4×2×3组合式放大器的计算结果表明：随着泵浦电压升高，ASE效应明显加强；23kV泵浦电压下，ASE效应造成的平均储能下降210%，小信号增益系数损耗为16.62%，增益不均匀性为7.44%；增益长度积可以作为判断ASE效应的依据，其值越大，ASE效应越强。Abstract: The amplified spontaneous emission(ASE) effects in high power laser slab amplifier are investigated by theoretic simulations. A time-related 3D ASE model is developed with which the ASE effect in large aperture Nd:glass amplifier is investigated in detail. The effects of ASE to the stored energy efficiency and to small signal gain coefficient are got under different pump voltage, pump time, stored energy distribution and different gain-length product. The simulation results in the 4×2×3 amplifier indicate that the effect of ASE is stronger with the improved charge voltage, the loss of average stored energy is 21.0% by ASE, the loss of small signal gain coefficient is 16.62%，the uniformity of small signal gain coefficient is 7.44% over the aperture while pumping voltage is 23kV. The gain
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Key words:
- nd:glass /
- slab amplifiers /
- amplified spontaneous emission /
- stored energy density
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