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针对激光加工过程中,红外激光只能用于金属材料的加工,而紫外激光则常用于非金属材料的加工,无法同时兼顾两种材料的问题,提出一种1064nm和355nm双波长激光器,可在两种波长之间自由切换,分别用于金属和非金属材料的加工。激光器采用大功率激光二极管端面泵浦Nd:YAG晶体,V型谐振腔,Ⅰ类相位匹配LBO晶体和Ⅱ类相位匹配LBO晶体进行腔内倍频与和频的方式实现355nm紫外激光输出。通过计算设计了高效稳定的紫外基频谐振腔,以此谐振腔参数为基础,又计算获得高功率高光束质量输出的红外谐振腔。两者之间采用旋转反射镜进行自由切换,简单而有效的实现一棒多波长输出技术,满足加工的多样性需要,有利于工业化的应用。在泵浦功率最大为40W时,得到了5.5W紫外激光输出和18.1W红外激光输出。
For the laser processing, the infrared laser can only be used for the processing of metal materials, while the UV laser is commonly used in non-metallic materials processing, can not take into account the two materials at the same time, proposed a 1064nm and 355nm dual-wavelength laser, Switching between the two wavelengths are free, respectively, for the processing of metal and non-metallic materials. The laser achieves 355nm ultraviolet laser output by using high power laser diode end-pumped Nd: YAG crystal, V-type resonator, phase-matched LBO crystal and phase-matched LBO crystal of phase II for intracavity frequency doubling and sum frequency. Based on the resonant cavity parameters, an infrared resonant cavity with high power and high beam quality output is calculated. The rotating mirror is used for switching freely between the two. The simple and effective implementation of one-stick multi-wavelength output technology meets the processing diversity needs and is good for industrial applications. When the pump power is up to 40W, 5.5W UV laser output and 18.1W IR laser output are obtained.