A method for measuring the frequency stability of tunable laser is proposed by using confocal Fabry-Perot (F-P) interferometer. The F-P interferometer is used to get the output frequency of the laser as a reference, and the method eliminates the need of an independent optical source as a frequency reference. Using this technique, the frequency stability of the tunable external-cavity diode laser (ECDL) is measured to be 2.26×10^-9with an integration time of 20 ms.

In order to characterize the metallic-oxide grayscale films fabricated by laser direct writing (LDW) in indium film, a new method with micro-Raman spectroscopy and atomic force microscope (AFM) is proposed. Raman spectra exhibit the characteristic band of In₂O₃ centered at 490 cm^-1, in which the intensities increase with the decreasing optical density of the In-In₂O₃ grayscale films. The mapping information of Raman spectra shows that the signal intensities of the film in the same grayscale area are uniform. Combining with the information of In-In₂O₃ grayscale film from AFM, the quantitative relationship between the concentration of In₂O₃ and the Raman signal intensity is shown. Compared with the conventional methods, the resolution of micro-Raman scattering method is appropriate, and the scanning speed is proper to analyze the structure of metallic-oxide grayscale films.

研究了飞秒激光加工参量对刻写质量的影响，分析了激光能量吸收的多光子效应，测试了刻写通道的传输特性.实验结果表明，激光刻写的通道具有良好的波导特性：当激光脉冲能量在20 μJ左右，扫描速度在300 μm/s～400 μm/s之间时，刻写通道的传输损耗小于1 dB/cm，低于晶体的传输损耗，其原因是激光诱导锂离子的扩散引起了晶体内部局部折射率的增加.

为了探索超热电子的加热机制,利用光学CCD相机和OMA光学多道分析仪,分别在靶背法线方向测量了光学渡越辐射(OTR)积分成像图案和光谱.实验在100 TW掺钛蓝宝石激光器上进行,飞秒激光与铜膜靶作用后,靶表面发光信号由空间分辨装置聚焦成像并引到CCD或OMA谱仪的狭缝上.测得的积分成像图案呈圆环状,光斑形成区域直径约为225 μm,在圆环边缘附近出现局部化明亮光信号,该现象表明,超热电子在传输的过程中存在成丝效应,其分布也不均匀.光谱在300～500 nm之间出现一系列非周期锐利尖峰,在400 nm(2ω₀)附近出现的尖峰应归因于v×B加热机制产生的超热电子引起的相干渡越辐射(CTR).