The solemn meeting dedicated to the 50th anniversary of the Institute of Atmospheric Optics SB RAS was held on October 17 of 2019 in the Rubin Congress Center, Tomsk. Professor I.V. Ptashnik, director of the Institute of Atmospheric Optics, took a lot of congratulations on this anniversary, in particular, from Chinese colleagues, who visited Tomsk specially to attend this meeting. Professor Ruizhong Rao, director of the Anhui Institute of Optics and Fine Mechanics, presented a memorable plate on the occasion of the 50th anniversary of the Institute of Atmospheric Optics. In addition, the plate is made on the occasion of the first visit of Academician Vladimir Evseevich Zuev to Hefei, China, with a survey report about development of science and laser sensing in Tomsk. Professor Ruizhong Rao was among young scientists, who listened this report more than 30 years ago. The cooperation started from that visit continues and progresses successfully. In 2009 Prof. Ruizhong Rao with a large delegation of his colleagues from China visited the Institute of Atmospheric Optics to sign the official agreement about cooperation, and in 2019 the Chinese-Russian Research Center on Atmospheric Optics has been organized.