Recently, the team of Laser Physics and Technology Research Center of the Institute of Physics and Chemistry of the Chinese Academy of Sciences has made innovations in the field of picosecond optical parametric laser research, solving the problem that it is difficult to achieve large energy output in the international long-term ultrashort pulse optical parametric oscillation (OPO). The team is led by Xu Zuyan, an academician of the Chinese Academy of Engineering, and researcher Peng Qinjun. He has long been engaged in the field of solid-state laser research.
High-energy ultrashort pulse OPOs have important applications in many fields, such as attosecond light science, laser and material interaction, and laser remote sensing. In the traditional synchronous pump ultrashort pulse OPO design, in order to achieve high energy ultrashort pulse OPO output, the fundamental frequency light pulse needs to work at low repetition frequency. However, to meet the synchronous pumping condition, the pulse repetition frequency is lower. The longer the OPO cavity length required, the limited pulse energy obtained by the previously reported ultrashort pulse OPO, only on the order of μJ.
The researchers proposed a new idea of regenerative optical parametric oscillation (RG-OPO) to achieve a maximum pulse energy of 30.5 μJ, a repetition rate of 10 kHz, and a wavelength of 1.53 μm in an OPO cavity of only 1.5 m in length. The OPO signal light pulse output with a pulse width of 7 ps increases the highest single pulse energy of the international epithelial OPO output by 20 times.
The research results are the first in the world to open the door of ultra-short pulse OPO energy into tens of μJ, and have the potential to increase 3 orders of magnitude to several mJ in the future, solving the long-term ultra-short pulse OPO pulse energy stop at μJ Level of international problems. This technology is not only suitable for picosecond OPO, but also for femtosecond OPO.