According to Soochow University's WeChat ***19th,Comrade Pan Junhua, academician of the Chinese Academy of Engineering, famous expert in applied optics, researcher and doctoral supervisor of the School of Optoelectronic Science and Engineering of Soochow University, passed away at 15:48 on December 18, 2023 in Suzhou at the age of 94 due to ineffective medical treatment. 
Traveling in the world of optics, just to be able to apply what you have learned when you return to ChinaAccording to Guangming**, Pan Junhua was born in Shanghai in October 1930. After graduating from Tsinghua University in 1952, he majored in mechanical manufacturing and was assigned to work in the Instrument Museum of the Chinese Academy of Sciences (the predecessor of the Changchun Institute of Mechanical Engineering, Chinese Academy of Sciences). In 1956, Pan Junhua accepted the arrangement of the unit to study in the Soviet Union under the tutelage of the famous Soviet astronomical and optical expert Maksutov. Since Pan Junhua's undergraduate is mechanical, and optics is only at an amateur level, he Xi studied harder. In the first year, graduate students are required to complete four courses in philosophy, Russian and two specialized courses, of which philosophy and Russian are taught two or three times a week in the department of the USSR Academy of Sciences in the city. After hard work, he got perfect marks in all four courses. His thoughts at the time were simple:"I always think that I can't embarrass the country, and I can apply what I have learned when I return to China. ”Pan Junhua's ** title is "The Inspection of the Secondary Convex Mirror of the Large Telescope". It's a decent topic, and it's basically a matter of hard work and a lot of calculations. In the process of step-by-step calculation, Pan Junhua couldn't help but think: what other way can test the convex mirror?He applied the compensation principle of the reflection test to the inspection of convex mirrors, and found a test method that is superior to the Hindle method. This new test method for the secondary convex secondary mirror of the large telescope, which was called the "Pan's method" by the Soviet side, was actually applied to the Soviet Union's 6-meter telescope and China's 60-centimeter telescope and 2Secondary mirror inspection of a 16-meter astronomical telescope. 
*: Guangming Weibo.
I am not afraid of difficulties, but I am afraid that there is no realistic and pragmatic attitudeIn August 1960, Pan Junhua returned to Changchun Institute of Optics and Mechanics and immediately participated in the development of the 60 cm intermediate test telescope, accumulating valuable experience for the design of Project 216. In 1975, the Chinese Academy of Sciences launched 2The development of a large telescope with a diameter of 16 meters was carried out, and a leading group of the 216 project was established, with Pan Junhua as the leader of the overall technical group. I am not afraid of difficulties, but I am afraid that there is no realistic and pragmatic attitude”Pan Junhua said. With his rigorous, meticulous and down-to-earth scientific research spirit, hundreds of large and small problems of the project have been properly solved. 2.Before the 16-meter astronomical telescope leaves the factory, it must be installed once in the factory, and the skylight is required to be opened for observation. But the old factory has no skylight, how to observe?According to the original plan to build a special plant, but later due to financial problems to wait for time, "do technology is most afraid of delaying time, waiting for the construction of the plant, the work has to stop, the consequences are very serious." Pan Junhua found the drawings of the assembly plant and found that the glass windows used for high-rise lighting had a diameter of two meters, and if the window frames were not moved and the glass was removed, this range could meet the requirements of observation, which made him very happy. High dispersion and high signal-to-noise ratio spectroscopy is one of the important frontier research fields of contemporary astrophysicsPan Junhua led the team to successfully develop it in 7 years, which is the first time in China to develop a large-scale astronomical spectrometer using a stepped grating with large orientation angle, advanced order, combination of high dispersion and high luminous efficiency, which has become an extremely important tool for modern astrophysics research. 2.The 16-meter optical astronomical telescope was developed by China and had the largest aperture in the Far East at that time, and was known as "a monument" in the Chinese astronomical community, and the project won the first prize of the National Science and Technology Progress Award in 1998. Behind the award is Pan Junhua's hard work and sweat in scientific research for more than ten yearsFrom the start of the second start of development to the trial observation in 1989, 2The development of the 16-meter astronomical telescope took a full 15 years. The "optical all-rounder" who shines in the starry sky, hisAll his life in "chasing the light".
In 2019, the asteroid with the international number 216331 was named "Pan Junhua".The near-Earth object telescope that discovered this "Pan Junhua star" was completed thanks to his technical support. Pan Junhua's whole life has been "chasing light". He actively advocated and implemented the use of aspheric technology in China's optical systemHe invented a set of important optical processing and testing technologies for the development of large-scale optical equipment in China, and solved the key technical problems of various optical aspheric processingHe established the optical technology foundation of China's large-scale shooting range optical testing instrumentsHe taught his aspheric technology to his students and peers, and promoted China's optical processing and testing to the world's advanced ranks. Pan Junhua often said that it is precisely because of his hobby that he is willing to continue to study hard, so that he can do everything well without distractions, and enjoy the fun of solving problems more, without overly caring about personal gains and losses, and is more willing to share his knowledge, technology, and even the so-called "unique skills", so that technology can benefit more people. "I hope that current and future researchers can find what they really like and are willing to work hard for, and achieve more excellent results. This is Pan Junhua's expectation and encouragement for future learning. 
Content**: China News Service.
Editor of this issue: Qiu Tian Proofreader of this issue: Yang Chenhui Review: Fu Jian Wang Jun.
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