High-power lasers with specific wavelength outputs play a crucial role in industrial manufacturing, sensing, medical applications, and other advanced technological fields. However, as the demand for high-power laser applications continues to grow, the spectral and thermal limitations of traditional gain media impose significant constraints on key laser parameters such as wavelength tunability, power scalability, and beam quality. Overcoming these limitations requires the exploration of superior optical materials that can enable new approaches to high-power laser generation. Diamond crystals, with their exceptional optical properties—including a wide spectral transmission range, high nonlinear gain coefficient, and outstanding optical damage threshold—have emerged as a highly promising medium for the next generation of high-power lasers. By leveraging diamond Raman conversion, we have achieved near-diffraction-limited high-power laser outputs, with continuous-wave power exceeding the kilowatt level and peak power reaching the megawatt range. Furthermore, we have successfully extended laser wavelengths across the ultraviolet, visible, and eye-safe spectral regions, significantly broadening the application potential of high-power laser systems.

This report will present our group’s latest research breakthroughs in nonlinear frequency conversion technology based on diamond crystals, with a focus on advancements in power scaling, spectral narrowing, and wavelength extension. In particular, we will highlight innovative technical approaches for achieving multi-parameter beam controllability, optimizing laser performance, and enhancing system stability. Finally, we will discuss the prospective impact of these developments on laser manufacturing, precision processing, and frontier scientific research.