中国激光领域奠基人周炳琨院士逝世，享年90岁

Core Viewpoint - The passing of Professor Zhou Bingkun, a pioneer in laser and optoelectronics in China, represents a significant loss for Tsinghua University and the broader field of laser and optoelectronics in the country [5]. Group 1: Contributions to Science and Education - Zhou Bingkun was instrumental in establishing the laser research group at Tsinghua University in 1962, leading to the creation of the laser (optoelectronics) discipline and the development of solid-state lasers and their applications [3]. - He was the first to develop high-efficiency, long-lifetime, narrow-linewidth, and frequency-stable semiconductor laser-pumped solid-state lasers, opening new avenues in solid-state laser technology [3]. - Zhou's research in optoelectronics led to significant advancements, including crystal fiber growth, fiber amplifiers, wavelength division multiplexing, and time division multiplexing in optical communication, earning him multiple national awards [3]. Group 2: Educational Impact - Zhou Bingkun authored the textbook "Principles of Laser" in 1980, which became a classic in the field and has been revised to the seventh edition, nurturing generations of talent in optics and optoelectronics [4]. - His students have become leaders in the field, reflecting his commitment to education and mentorship [4]. - Zhou encouraged young scholars to find their research direction, embrace challenges, and seize opportunities, embodying his own life philosophy [4]. Group 3: Legacy and Recognition - Zhou Bingkun held numerous prestigious positions, including President of the Chinese Optical Society and Vice President of the International Optical Society, contributing to the governance of scientific research in China [2]. - He was elected as an academician of the Chinese Academy of Sciences in 1991 and received various honors for his contributions to science and technology [2][3]. - His life and work exemplified the spirit of Tsinghua University, characterized by self-improvement and moral integrity, earning him deep respect and admiration from colleagues and students [4].