中层顶区域（80~110 km）的大气探测具有重要的科研和应用价值。长期以来，由于传统探测手段的限制，该区域一直是人类了解相对较少的大气层区域，存在着由流星注入产生的大气金属层。由于金属原子、离子共振荧光散射的散射截面比瑞利散射、拉曼散射大得多，其可以被激光雷达探测到。半个世纪以来，利用原子、离子特定波长的跃迁光谱，向高空大气发射特定波长的激光，并结合遥感技术，开展了大气金属层探测，这些金属原子、离子是大气波动极好的示踪物，可获得大气原子数密度、温度、风场等参量。近年来，随着热层金属层不断被发现，大气金属层的高度范围逐渐拓展，金属层研究又受到人们的极大关注。本文以作者团队及合作者的工作为基础，以大气金属层激光雷达采用的激光器发展历程为主线，介绍了地基激光雷达对大气金属层探测研究的发展过程以及国内外研究现状与发展趋势。

为了优化液晶类微管激光器的性能, 本文研究了偶氮染料掺杂聚合物分散液晶微管激光器出射激光的性能及光控性。通过在不同纤芯直径的玻璃毛细管中制备掺杂偶氮染料的PDLC, 并分别测量这些样品的随机激光阈值。增加紫外线照射强度, 测量随机激光的光谱。实验结果表明,不同芯径毛细管样品(100 μm, 300 μm, 500 μm)的随机激光阈值测量为11.8 μJ/脉冲, 8.6 μJ/脉冲和13.2 μJ/脉冲。实验结果还表明, 随着紫外线照射强度的增加(从0 mW/cm2 增加到150 mW/cm2), 随机激光强度逐渐减小, 光谱的半高宽变宽。随机激光在光学调谐过程中在不同偏振方向的紫外光束下显示出相似的特性。该工作验证了在圆柱形约束结构中制造微型激光器件的可能性, 并扩展了PDLC的应用范围。

基于低温稀土离子掺杂晶体中的光谱烧孔效应的激光稳频技术,以低温下稀土离子掺杂晶体中的光谱烧孔为频率锁定参考,有更低的热噪声极限,而且,与基于法布里-珀罗参考腔的激光稳频技术相比,该技术具有对外界温度、压力和加速度的变化更不敏感的优势,因此其频率稳定度理论上可达10 ^-17量级,能实现与法布里-珀罗参考腔可比拟甚至超越的稳频效果。从理论原理、技术实现、国内外研究进展几方面介绍了基于光谱烧孔效应的激光稳频技术,并对其在频率稳定技术领域的发展前景进行了展望。

为了优化液晶类微管激光器的性能, 拓展其应用领域, 本文研究了银纳米颗粒和氧化锌纳米颗粒对染料掺杂聚合物稳定液晶微管激光器出射激光的影响。通过掺杂不同浓度的银纳米颗粒和氧化锌纳米颗粒在聚合物稳定液晶的微管随机激光器中, 探究其对微管激光器出射激光特征的影响, 并对比两种纳米颗粒的影响效果。实验结果表明: 当在聚合物稳定液晶微管激光器中掺入0.1%的银纳米颗粒后, 随机激光出射强度增强, 其激光阈值从23.2 μJ/pulse减小至10.9 μJ/pulse。当氧化锌纳米颗粒的掺杂浓度达到1.0%时, 在随机激光出射强度增加的同时, 激光出射阈值会减小至21.2 μJ/pulse。然而, 过量纳米颗粒的掺杂均会造成随机激光出射光强的降低和激光阈值的增加,其原因在于纳米颗粒团簇的产生, 降低了纳米颗粒的散射作用。实验结果还表明, 银纳米颗粒掺杂对微管激光器性能的提升明显优于氧化锌, 这归因于银纳米颗粒所引发的局域表面等离共振效应会增强其散射作用。通过掺杂纳米颗粒, 微管随机激光器的性能得到了提升, 为其在通讯、加密以及液晶显示等领域奠定了基础。

研制了一台利用大气后向散射信号探测NO2浓度廓线的差分吸收激光雷达(DIAL)。用两台Nd∶YAG激光器分别抽运两台染料激光器，获得测量大气NO2浓度所需的波长分别为λon和λoff的两束激光，通过数据反演获得NO2浓度的水平和垂直分布。实验结果表明，淮南大气科学研究院内大气垂直高度0.4~3.0 km范围内的NO2体积分数在0~2.5×10-8范围内波动，水平距离0.4~3.0 km范围内的NO2体积分数在0~3.0×10-8范围内波动。

We examine the temperature-dependent reflection shifts, microscopic morphology, and laser emission of polymer-stabilized cholesteric liquid crystals. The preparation parameters, including the concentration of photo-initiator and laser dye, are evaluated and their influence on reflection band is considered not to be ignorable. Inadequate ultraviolet (UV) curing time less than the required value to fully photo-polymerize the monomer can also influence the spectral position and shape of the reflection band but still favor possible band-edge lasing, whereas extending UV curing duration can weaken and eventually eliminate the laser emis-sion. The behaviors are explained using the results derived from the mean field theory.

A two-dimensional (2D) distributed feedback (DFB) structure is fabricated on dye-doped sol-gel derived hybrid zirconia films by soft lithography. The Q-switched Nd:YAG laser (\lambda = 532 nm) is used to pump these structures. The lasing emissions of the gain medium doped with Rhodamine 6G (Rh6G) in two perpendicular directions are shown, and the threshold pump energy is measured.

We describe modeling the solid-state dye laser with the microcavity size comparable to light wavelength. Certain symmetry in the allocation of gain material leads to depletion of odd longitudinal modes that, in turn, increases the tunability range of the microlaser. We provide simple physical explanation for the modeling results.

The enhancement of stimulated Raman scattering (SRS) of acetone (C3H6O) and the generation of three-color lasers in lasing dye rhodamine B (RB) were reported. The first-order Stokes wave (629.9 nm) of SRS of C3H6O was amplified by 2.83 times than that of pure C3H6O. At the same time, a dye laser of RB at the wavelength from 575 to 598 nm can be generated in a suitable concentration of RB between 3*10^(-5) and 2*10^(-4) mol/L. Thus the green pump laser, yellow dye laser, and red Stokes wave concurred.