全固态和频593.5nm黄光激光器激光反射镜的研制

Manufacture of Laser Mirrors for All-solid-state Sum Frequency Mixing 593.5 nm Yellow Lasers

从双波长激光运转及和频的机理出发,研制了LD泵浦Nd:YVO4 晶体、LBO腔内和频593.5 nm连续黄光激光器激光反射镜的光学薄膜。为了达到最佳的和频输出,对膜系要求进行了分析,采用对谐振腔一端面反射率固定不变,对另一腔镜基频光透过率进行调谐的方法,给出合理初始结构后,利用计算机对膜厚进行优化,采用离子束溅射和离子束辅助沉积的方法,通过时间监控膜厚成功地制备出全介质激光反射膜。在室温下,实现1 064 nm和1 342 nm双波长连续运转,并通过Ⅰ类临界相位匹配LBO晶体腔内和频实现593.5 nm黄色激光连续输出。当泵浦注入功率为1.8 W时,和频黄激光最大输出达85 mW,光光转换效率为4.7%,功率稳定性24 h内优于±2.8%。

A series of optical thin films for LD pumped Nd:YVO4 crystal, LBO intracavity sum-frequency-mixing 593.5 nm yellow laser are designed and manufactured based on dual-wavelength action and sum-frequency-mixing theory. To obtain optimum output power, the coating design of laser mirror is analyzed. One resonator facet transparence for fundament laser light is adjusted by fixing the other resonator facet reflectivity is used. Using computer thin film optimization method based on the initiative structure, the dielectric high reflective laser mirror for yellow laser is achieved with double ion beam sputter technique, which is controlled by a time-power monitoring method. An optimized CW 593.5 nm yellow laser at room temperature is obtained for the first time. The maximum laser output power of 85 mW is achieved when the incident pump laser of 1.8 W is used. The optical-to-optical conversion is up to 4.7%, the power instability in 24 h is better than ±2.8%.