从双波长激光运转及和频的机理出发，对LD泵浦Nd∶YAG，LBO腔内和频500．8nm青光激光器所使用的光学薄膜进行了设计和制备．在激光反射镜的设计上，为了达到最佳的和频输出，对膜系要求进行了深入分析．采用对谐振腔一端面反射率固定不变并通过对另一腔镜基频光的透射率进行调谐的方法，在给出合理初始结构后，利用计算机对膜厚进行了优化．并采用双离子束溅射沉积的方法，通过时间监控膜厚法成功制备出青光激光器所使用的全介质激光反射膜，在室温下实现946nm和1064nm双波长连续运转，并通过Ⅰ类临界相位匹配LBO晶体腔内和频在国内首次实现500．8nm青色激光连续输出．当泵浦注入功率为1．4W时和频青光最大输出达20mW．

A new kind of resonator for doubly resonant continuous-wave (CW) intracavity sum-frequency mixing (SFM) is presented. A coherent radiation of 327 mW at 555 nm is generated by mixing 1342-nm Nd:YVO4 laser and 946-nm Nd:YAG laser. The M2 beam quality factor of the sum-frequency mixed yellow-green laser is less than 1.7. The low-noise characteristic of the yellow laser is demonitrated.

A laser diode (LD) pumped Nd:YAG red pulse laser at 660 nm was presented by V:YAG passively Q-switching and LBO intracavity frequency doubling. With 1.6-W incident pump power, average output power of 46-mW, pulse duration (FWHM) of 23.3 ns, pulse repetition rate of 21.6 kHz, peak power of 91.4 W, and single pulse energy of 2.13 μJ were obtained. The beam quality factor M2 was less than 1.2. The fluctuations of pulse energy and repetition rate were less than 3% in 4 hours. The pulsed laser at 660 nm is expected to be used as the pump source of Cr^(3+):doped crystal to obtain the gain-switched tunable laser.

In a diode-pumped, KTP intracavity frequency-doubled green laser, multi-Brewster plates are used to achieve high power single-frequency operation. With a simple experimental setup, single-frequency operation of the diode-pumped green laser with output of 46 and 218 mW is obtained by one and three Brewster plate, respectively.