建立了包括非热稳定热力学模型、光学传输模型、能量转换模型及非稳腔模型的综合理论分析平台.理论分析得到以下主要结论:谐振腔长度变化对光束质量及光光效率的影响不大,对于给定的增益,激光最佳效率和光束质量分别对应不同的非稳腔放大率.提出非稳腔腔内相位板补偿介质静态畸变提高光束质量的技术措施,并开展实验验证,光束质量由补偿前的5.48倍衍射极限提升到补偿后的2.46倍,输出功率为12.1 kW.

激光破岩技术在石油工业上具有广阔的应用前景,但目前国内对激光与岩石相互作用机制的研究还比较少见.根据非定常传热学原理分析了均匀激光光束和高斯激光光束照射砂岩时的温度场分布;根据热应力方程和边界条件模拟了砂岩内部的热应力分布,得到有效切削砂岩所需的激光功率阈值;根据能量守恒定律建立岩石的熔化和气化模型,得到一定激光功率下岩石熔化和气化的速率.模拟结果表明,在深井中采用激光钻井技术,其钻进速度远高于常规的机械旋转钻井技术,具有显著的工业应用潜力.

In order to explore new high power laser systems, a liquid laser pumped by diode was build up. In the experiment, diode laser was adopted to pump neodymium ion doped inorganic laser liquid on single side. By measuring the near field profile, pulse shapes and the spectrums of the output light, liquid laser output was proved. Laser wavelength is 1 053 nm. A laser pulse output energy value reached 47 mJ and optical to optical efficiency 14%. Its optical efficiency was much higher than that of flash lamp as pump light source, which shows that liquid lasers has the outlook to high power laser systems.