![]() ![]() ![]() It was proven that KBBF crystals are excellent nonlinear optical crystals that can achieve deep ultraviolet laser output through direct frequency doubling. Taking KBBF crystals as the representative example, their discovery, crystal growth, corresponding prism-coupled device technology, main optical properties, and ability to generate deep ultraviolet coherent light are each introduced. This paper reviews the research progress of deep ultraviolet nonlinear optical crystals and all-solid-state deep ultraviolet coherent light sources. An effective and feasible technical approach is to use commercially available visible and near-infrared all-solid-state lasers as the fundamental frequency light source to generate a deep ultraviolet laser through cascaded frequency conversion using nonlinear optical crystals. The character Li Huanying in the movie is based on Jia Ling's late mother.Abstract: All-solid-state deep ultraviolet coherent light sources have important applications in frontier science, high technology and many other fields. Ace co-star Shen Tang makes a special appearance. Jia Ling's fellow actor-comedian and Ace vs. Filming lasted over three months from Septemto January 7, 2020.It is based on a 2016 comedy skit made for season one of Comedy General Mobilization on Zhejiang TV which also starred Jia Ling, Chen He and Zhang Xiaofei. It is one of the movies for Chinese New Year 2021.Xiaoling assumes that she can apply ideas that are ahead of the times to broaden the world of those around her and help her mother "succeed." However, Jia Xiaoling is surprised by the outcome. ![]() As the two become inseparable, Jia Xiaoling also meets a group of good friends. In a state of emotional breakdown, Jia Xiaoling unexpectedly returns to the year 1981 and meets her mother Li Huanying (Zhang Xiaofei). One day in the year 2001, Jia Xiaoling (Jia Ling) who has just been admitted to university experiences the most unimaginable heartbreak when her mother dies from a tragic accident. However, she is able to travel through time and space to learn the story of her parents when they were young. Actress Jia Xiaoling experiences the grief of wanting to serve her parents but having lost the chance. ![]()
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