补齐最后一块拼图！北京团队突破核光钟研制核心技术

Core Insights - A young research team in Beijing has successfully generated continuous laser at a wavelength of 148 nanometers, overcoming the final core bottleneck in the development of nuclear optical clocks, and has expanded ultra-stable laser technology into the vacuum ultraviolet range [1][3][4] Group 1: Research Breakthrough - The achievement allows for a significant advancement in human precision time measurement capabilities [1] - The research team, led by Tsinghua University associate professor Ding Shiqian, has made the first international breakthrough in producing 148 nanometer continuous wave laser [4] - The team consists of members with an average age of under 30, showcasing strong theoretical foundations and independent working abilities [4] Group 2: Technical Details - The principle of atomic clocks relies on the outer electron transitions of atoms, which are sensitive to electromagnetic field environments, affecting timing precision [3] - Nuclear optical clocks, based on the excitation state energy of thorium-229, are less sensitive to external influences, allowing for improved portability and measurement precision [3][4] - The successful generation of the laser was achieved using four-wave mixing technology in cadmium vapor at approximately 600 degrees Celsius, with no noise interference observed [4] Group 3: Future Prospects - The research team aims to further optimize the laser output quality and reduce the size of the laser system, potentially to the size of a computer case [5] - The developed laser source platform could serve various applications, including new navigation systems, quantum precision measurement research, quantum information experiments, and semiconductor chip testing [5]