为使星载激光高度计实现高空间分辨率，提出了一种联合采用伪随机码(PRC)相位调制光纤激光器和外差探测的测距方法。推导了用于测高时的信噪比公式。对激光发射功率、参考光功率、望远镜口径、调制速率以及PRC序列长度对信噪比和距离分辨率的影响进行了数值模拟。对系统参数进行分析，得到了相关参数的关系和优化的参数。结果表明,当激光出射功率约为10 W，参考光功率约为10 mW，望远镜口径为0.4 m，调制速率为1 GHz，单周期内PRC序列长度约为300 μs时，基于PRC相位调制和外差探测的星载激光测高计能够实现系统信噪比为10和距离分辨率为15 cm的设计目标。

针对丝网印刷碳纳米管阴极,提出电流法进行表面后处理,有效改善碳纳米管阴极场发射特性。利用扫描电子显微镜表征电流法处理前后CNTs 阴极表面形貌变化,并对处理前后CNTs阴极进行场发射特性测试。结果表明,电流法处理后CNTs阴极表面残留有机物被破坏,开启电场从2.4 V/μm降低到1.6 V/μm,同样面积的薄膜(印制面积为1 cm×1 cm)在2.6 V/μm场强下的发射电流由30 μA提高到了800 μA,说明电流处理对于提高薄膜的场发射特性有明显作用。该方法在碳纳米管场发射显示器的制作中具有很好的实际应用价值。

通过对非线性薛定谔方程的求解,数值模拟了高功率激光系统中钕玻璃的B积分传输规律,并理论分析了B积分对光脉冲的波形和频谱的影响,详细介绍了几种消除B积分影响的方法.这对高功率激光系统中光放大有一定指导意义.

The multiplexed-reflective matched fiber grating interrogation technique was presented in this paper. The interrogation technique was based on the use of two (or more) wavelength-matched fiber Bragg gratings (FBGs) to receive the reflected signal from the sensing FBG. The two (or more) matched gratings were arranged parallelly and used as filters to convert wavelength into intensity encoded information for interrogation. Theoretical and experimental results demonstrated that the interrogation system is immune to the source fluctuation and cross-sensitivity effect between temperature and strain, and also can enlarge the dynamic range.

The noncollinear optical parametric amplification of BBO (β-BaB2O4) type-Ⅱ phase matching is theoretically investigated. The phase matching angle is calculated under different noncollinear angles. It shows that BBO type-Ⅱ phase matching has very narrow bandwidth in the simulation of the gain spectrum, which is confirmed in the numerical calculation of the parametric bandwidth. The dependence of the parametric conversion efficiency on the crystal length is simulated. The effects of the non-synchronization of the pump-pulse and signal-pulse and the shape of the incident signal-pulse on the parametric conversion effciency are also discussed. The parametric conversion efficiency has a maximum of 25% corresponding to the optimized crystal length and synchronization. The results indicate that BBO type-Ⅱ phase matching has very narrow parametric bandwidth and gain bandwidth. The approach is useful to the study of the narrow band optical parametric amplification. It also makes BBO crystal more useful in the optical parametric amplification.

理论研究了BBO晶体在Ⅱ类相位匹配下非共线情况时的参量放大特性。计算了在不同非共线夹角下的相位匹配角度。在增益谱分布的模拟计算中发现Ⅱ类匹配具有非常窄的增益带宽,并在其参量带宽的模拟计算中得到了证实。数值模拟了转换效率随晶体长度的变化曲线。分析了抽运光脉冲和信号光脉冲的时间不同步以及初始输入的信号光脉冲形状对转换效率的影响。选择最佳晶体长度和同步时间,最大转换效率可达到25%。研究结果表明BBO的Ⅱ类相位匹配具有非常窄的参量带宽和增益带宽,这对于窄带的激光参量放大的研究有重要意义,并拓宽了BBO晶体在光参量放大技术中的用途。

An approximative λ/4 -shifted DFB Yb-doped fiber laser was made in the length of 10 cm Yb-doped fiber by double exposure method. Then, it was treated with λ/4-shifted Yb-doped DFB fiber laser with UV trimming. The running characteristic of the laser with scaning F-P interferometer and oscilloscope was observated. SLM Yb-doped λ/4-shifted DFB fiber laser was obtained. The threshold is 20 mW. When pump power was 130 mW. 25 mW SLM laser at 1053 nm was got.

A Yb doped phase shifted Fiber Bragg Grating fabricated with double exposure method was reported in this paper.In the experiments, a weak peak was found in phase shifted FBG, and the phenomenon was explained.

Nd∶doped-glass-based sub-picosecond laser system with the maximum peak power of greater than 20 tara watts and the energy on target surface of 16 J is accomplished by using the chirped laser pulse amplification technology. While the laser pulse is focused by an off-axis parabolic mirror, the power density on target surface of approximately 2×10 18 W/cm 2 is acquired. In the performed neutron experiment, a C 8D 8 plate target is placed on the focal spot of the off-axis parabolic mirror. The maximum neutron yield for a single shot reaches 2.4×10 4. Still some other related problems are discussed

利用啁啾脉冲放大技术，建成了一台基于钕玻璃放大器1053 nm波长的亚皮秒超短脉冲激光系统(SPS)。系统的输出峰值功率大于20 TW，靶面最高能量可达16 J，采用离轴抛物面反射镜聚焦，在靶面上获得2×10 18 W/cm 2的激光功率密度，以此激光脉冲轰击氘化聚苯乙烯平面靶，获得单次发射最高2.4×10 4个中子产额。对中子产生的机理进行了相关的讨论。