光学元件中的杂质和缺陷会引起其激光损伤阈值的大幅降低，现阶段这一问题已成为激光装置向高功率、高能量方向发展的“瓶颈”，亟待解决。在对光学元件激光损伤的研究中发现，用低于光学元件损伤阈值的激光对元件表面进行预处理，可以有效提高光学元件的抗激光损伤能力。对激光预处理技术的提出背景、定性作用机理、定量理论模型及国内外技术应用现状进行了概述。并且介绍了一种可在薄膜制备过程中进行原位实时激光预处理的新型薄膜制备技术。最后指出，激光预处理技术作为一种无污染，可有效改善光学薄膜、光学玻璃、光学晶体元件损伤阈值的最有效方法之一，其作用机理、实用化、仪器化还有待进一步发展。

为了满足光电探测设备对不同温度环境下多波段的目标模拟需求，设计了一种便携式红外目标模拟器，选用可切换的黑体光源来进行照明，实现3~5 μm和8~14 μm的中波红外和长波红外的辐射特性。作为准直系统的平行光管口径为110 mm，考虑到中心遮挡问题，采用离轴反射式光学结构。在装调时利用该结构对300 mm口径的参考平面镜进行测量，测试结果PV值为0.356λ（λ=632.8 nm），RMS值为0.047λ。采用MSC. Patran进行建模，利用有限元分析方法完成了系统的光机热分析，在−10~50 ℃工作环境下，由温度变化引起的主次镜面形变化为纳米级别，对中红外波段可实现实时稳定成像，为光电探测设备提供宽波段的多种直接模拟目标。

本论文提出了氮化镓基有源体系的异质结构光子晶体谐振腔，以实现高品质因子和小模场体积的有源集成蓝光谐振。通过能带分析，明确了异质结构光子晶体谐振腔的工作机理。基于光子晶体的能带带边和带隙原理，实现了光子面内反馈、高品质因子谐振和面外垂直发射。基于时域有限差分方法，研究了核心区和包层区不同谐振腔参数下的谐振特性。讨论了微腔结构与谐振品质因子、腔损耗、谐振频率及模场体积等的影响关系。研究表明，通过异质结构可以有效地降低面内谐振损耗，实现了有源集成型蓝光波段的Purcell因子达到769，模场体积为0.7（λ/n）³。该研究为蓝光波段高Q/V_m谐振腔的设计开辟了道路，同时为具备优异谐振特性的异质结构光子晶体微腔的研究奠定了方法和理论基础。

An integrated polymer microtoroid resonator system fabricated using single-step, two-photon polymerization laser lithography is reported. The integrated microtoroid-waveguide system includes an integrated coupling waveguide for ease of optical coupling and has a quality factor of 16,000. We further demonstrate a nested double-spiral waveguide that allows higher spatial density of data, akin to a macroscopic form of space-division multiplexing. Experimental characterization reveals good transmission properties in the double-spiral waveguide device. In addition, the waveguides are demonstrated to support 30 Gb/s nonreturn-to-zero and 28 Gb/s pulse amplitude modulation 4 high-speed data.

This work reports a demonstration of electrically injected GaN-based near-ultraviolet microdisk laser diodes with a lasing wavelength of 386.3?nm at room temperature. The crack-free laser structure was epitaxially grown on Si substrates using an Al-composed down-graded AlN/AlGaN multilayer buffer to mitigate the mismatches in the lattice constant and coefficient of thermal expansion, and processed into “sandwich-like” microdisk structures with a radius of 12?μm. Air-bridge electrodes were successfully fabricated to enable the device electrical characterization. The electrically pumped lasing of the as-fabricated microdisk laser diodes was evidenced by the rapid narrowing down of electroluminescence spectra and dramatic increase in the light output power, as the current exceeded the threshold of 248?mA.