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为了满足低功耗甲烷检测技术的需要，基于甲烷气体分子在3.2~3.4 μm中红外波段具有主吸收峰的特性，研制了一种基于非色散红外光谱技术的超低功耗红外甲烷传感器及系统。在分析红外差分检测原理的基础上，重点研究了抗水汽干扰的LED、PD器件选型及光路设计。采用LED脉冲串电流驱动技术，将红外甲烷传感器的功耗降至10 mW。利用实验法研究了温度变化对传感器甲烷浓度测量结果的影响，通过数据分析及归一法线性拟合，得出了温度补偿算法公式。利用检测系统平台进行了性能实验，并给出了基本性能指标参数。该系统具有功耗低、抗水汽干扰、检测稳定性好的优点，具有重要推广应用价值。
研究了非均匀泵浦状态下径向偏振光束的退偏机理及补偿方法。理论分析表明非均匀泵浦条件下各向同性晶体横截面内由热致剪应力引起的剪切向热致双折射是导致径向偏振光退偏的主要原因。设计实验依次采用薄膜偏振片（TFP）测量法和纯度测量法评价了径向偏振光在非均匀泵浦条件下的退偏，其中TFP测量法用于检测径向偏振光的整体退偏，纯度测量法用于检测径向偏振光的局部退偏。在泵浦峰值功率1.1 kW下，两种评价方法测得的退偏量分别为2.34%和2.53%。基于理论分析和评价方法的结果，退偏补偿方案的设计中采用相位调制与空间模式匹配相结合的方式，将径向偏振光的退偏量优化了59%，并获得脉冲能量为19.36 mJ，纯度为90.13%的皮秒径向偏振光，光束质量因子M2为3.8。
利用速率方程模型分析主振-放大结构的高功率光纤激光器中反向信号光在放大级中的放大特性，结果显示连续波反向信号会被放大器所明显放大，同时严重影响激光器输出功率；而脉冲反向信号由于激光器稳态运转时不形成高储能，入射能量较高时放大效果并不明显。结合石英光纤和光纤端帽以及光纤光栅等器件的损伤阈值可知，连续波反向回光放大时系统中振荡器光纤光栅损伤风险较大，而脉冲能量毫焦量级的反向脉冲信号即可导致光纤损伤，另外端帽等器件在脉冲反向光作用下也存在损伤风险。
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In view of the thermal damage law and mechanism of monocrystalline silicon for millisecond pulsed laser, the temperature of monocrystalline silicon irradiated by millisecond pulsed laser is measured by high precision point temperature meter and spectral inversion system. Then the temperature evolution process is analyzed. Also, the temperature state during the whole process of thermal damage of monocrystalline silicon irradiated by millisecond pulsed laser and the corresponding damage structure are studied. The results of this study show that the peak temperature of laser-induced monocrystalline silicon increases with the increase of energy density when the pulse width is fixed, When the pulse width is between 1.5 ms-3.0 ms, The temperature decreases with the increase of pulse width. Temperature rise curve shows inflection point when it is close to the melting point (1687 K), the reflection coefficient is from 0.33 to 0.72. During the gasification and solidification stages, it also shows the gasification and the solidification plateau periods. Thermal cleavage damage of monocrystalline silicon precedes thermal erosion damage. Stress damage dominates under low energy density laser irradiation, while thermal damage dominates under high energy density laser irradiation. The damage depth is proportional to the energy density and increases rapidly with the increase of the number of pulses.
