Core Viewpoint - The team from the Xinjiang Institute of Physics and Technology, under the Chinese Academy of Sciences, has made significant advancements in the field of vacuum ultraviolet nonlinear optical crystal materials, which will play a crucial role in precision manufacturing and cutting-edge scientific research [1] Group 1 - The research team successfully developed ammonium borofluoride (ABF) crystals after extensive exploration and innovation [1] - The team overcame challenges related to large-size crystal growth and device processing technology [1] - Utilizing birefringent phase matching technology, the team achieved direct frequency doubling of vacuum ultraviolet laser output at 158.9 nm for the first time [1] Group 2 - This breakthrough provides a key material system for compact and efficient all-solid-state vacuum ultraviolet lasers [1]