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Chinese Academy of Sciences has achieved innovations in picosecond optical parametric laser research
[ China Instrument Network Instrument Development ] The team of Laser Physics and Technology Research Center of the Institute of Physics and Chemistry of the Chinese Academy of Sciences, under the leadership of Xu Zuyan, a researcher of the Chinese Academy of Engineering, and researcher Peng Qinjun, continued to work in the solid-state laser field for decades. Recently, the team has achieved innovations in the field of picosecond optical parametric laser research, and solved the problem that the ultra-short pulse optical parametric oscillation (OPO) in the world has been difficult to achieve large energy output, which has attracted attention and reports from the international academic community.
The fundamental frequency picosecond pulse and the OPO signal light pulse energy vary with the pump power, and the OPO maximum pulse energy is 30.5 μJ.
The team pioneered a new high-energy ultrashort pulse optical parametric oscillation technology that broke through the problem of ultrashort pulse optical parametric oscillation (OPO) energy boost. 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. Laser center researchers have proposed a new approach to regenerative amplification, optical parametric oscillation (RG-OPO) (Fig. 1), to achieve a maximum pulse energy of 30.5 μJ, a repetition rate of 10 kHz, and a wavelength of 1.53 in an OPO cavity of only 1.5 m in length. The OPO signal light pulse output of μm and pulse width of 7 ps increases the highest single pulse energy of the international epithelial OPO output by 20 times. The results were published in Optics Letters [43(3):539,2018] and subsequently rated as Newsbreaks by Laser Focus World in the 2nd issue of 2018.
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.
The breakthrough research results were based on the team's ongoing research on short-pulse solid-state lasers. Previously, the team's research on 1.3 μm short nanosecond pulsed lasers also achieved significant results. Bio-optics, frequency conversion, laser communication and other fields require a high-power, low-cost 1.3 μm-band laser with a pulse width of less than 10 ns. The team's researchers realized that the cavity-inverted air-conditioning Q method achieves a high power narrow pulse width of 1.3 μm. The advantage of nanosecond laser, and the method has the characteristics that the pulse width is not affected by factors such as output power and repetition frequency. Before this, no research has been carried out in the world. Through in-depth research, the team achieved a 1.3 μm pulsed laser output with a maximum power of 3.2 W, a repetition rate of 2-10 kHz, and a pulse width of 4.7 ns. Under the same conditions, the traditional Q-switching method obtained a pulse width of 120 ns, while the cavity-inverted air-conditioning Q obtained a pulse width of only 4.7 ns (Fig. 2). The research results were published in Applied Optics [54(4):717,2015], and were selected by OSA in Spotlight On Optics in February 2015, and a letter was sent to congratulate him. The evaluation of this research will stimulate the pulse of 1.3 μm band. Lasers are more in-depth research applications.
(Original title: Physicochemical Institute's picosecond optical parametric laser research has achieved innovative results)