Report Highlights: The fundamental knowledge of optics and its technical applications are constantly unfolding and changing with each passing day, and have made a substantial contribution to the development of human society. Single-molecule detection and sensing, nano and atomic scale microscopic imaging, ultra-broadband laser and spectral detection are among the major frontier issues in current optics and natural sciences. This report will introduce the research progress of our team in recent years on full-spectrum white-light femtosecond laser, an important frontier scientific challenge. Based on a uniquely designed chirped periodically poled lithium niobate (CPPLN) crystal, and in combination with the synergic action of second-order nonlinearity (2nd-NL) and third-order optical nonlinearities (3rd-NL), we have progressively improved the conversion efficiency, spectral bandwidth, pulse energy, and spectral flatness of white-light femtosecond laser. We have successfully achieved a single pulse energy at the 1mJ level, with a bandwidth covering the full spectrum from deep ultraviolet to visible to mid-infrared (200-5000nm), which is expected to open up new horizons for high-speed optical spectroscopy.

Time: August 15, 14:30-16:30 Location: Lecture Hall on the First Floor of the Zutong Building

Professor Li Zhiyuan graduated from the Department of Physics at the University of Science and Technology of China in 1994 and obtained his Ph.D. from the Institute of Physics, Chinese Academy of Sciences in 1999. He was selected for the "Hundred Talents Program" of the Chinese Academy of Sciences in 2004, received the National Science Fund for Distinguished Young Scholars in 2005, and was awarded the "Wang Daheng's Optical Prize" by the Chinese Optical Society in 2011. He was named on the list of Highly Cited Researchers in 2014 and 2018, and on the Highly Cited Chinese Researchers List from 2016 to 2023. From 2004 to 2016, he served as a researcher and group leader at the Institute of Physics, Chinese Academy of Sciences. Since October 2016, he has been a professor and vice dean at the School of Physics and Optoelectronics, South China University of Technology. He has been engaged in theoretical, experimental, and applied research in micro-nano photonics, nonlinear optics, laser technology, topological photonics, and quantum physics for nearly 30 years. He has published over 500 SCI papers in physics, optics, chemistry, and materials science journals such as PRL, Sci. Adv., Nat. Commun., JACS, Adv. Mater., Nano Lett., ACS Nano, Light, with 34,000 SCI citations, an H-index of 87, and has given more than 130 invited talks at important domestic and international academic conferences. He is currently the Deputy Editor-in-Chief of Acta Photonica Sinica.