Author Affiliations
Abstract
1 National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
2 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
3 School of Electronic and Information Engineering, Hebei University of Technology, Tianjin 300401, China
Laser pulses of 200 ps with extremely high intensities and high energies are sufficient to satisfy the demand of shock ignition, which is an alternative path to ignition in inertial confinement fusion (ICF). This paper reports a type of Brillouin scheme to obtain high-intensity 200-ps laser pulses, where the pulse durations are a challenge for conventional pulsed laser amplification systems. In the amplification process, excited Brillouin acoustic waves fulfill the nonlinear optical effect through which the high energy of a long pump pulse is entirely transferred to a 200-ps laser pulse. This method was introduced and achieved within the SG-III prototype system in China. Compared favorably with the intensity of $2~\text{GW}/\text{cm}^{2}$ in existing ICF laser drivers, a 6.96-$\text{GW}/\text{cm}^{2}$ pulse with a width of 170 ps was obtained in our experiment. The practical scalability of the results to larger ICF laser drivers is discussed.
frequency matching high-intensity laser pulse stimulated Brillouin scattering High Power Laser Science and Engineering
2019, 7(3): 03000e41
Author Affiliations
Abstract
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
We obtain the output of a 284 ps pulse duration without tail modulation based on stimulated Brillouin scattering (SBS) pulse compression pumped by an 8 ns-pulse-duration, 1064 nm-wavelength Q-switched Nd:YAG laser. To suppress the tail modulation in SBS pulse compression, proper attenuators, which can control the pump energy within a rational range, are added in a generator-amplifier setup. The experimental result shows that the effective energy conversion efficiency triples when the pump energy reaches 700 mJ to 51%, compared with the conventional generator-amplifier setup.
190.0190 Nonlinear optics 140.0140 Lasers and laser optics Chinese Optics Letters
2016, 14(9): 091901
Author Affiliations
Abstract
1 National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
2 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
A 100-J-level Nd:glass laser system in nanosecond-scale pulse width has been constructed to perform as a standard source of high-fluence-laser science experiments. The laser system, operating with typical pulse durations of 3–5 ns and beam diameter 60 mm, employs a sequence of successive rod amplifiers to achieve 100-J-level energy at 1053 nm at 3 ns. The frequency conversion can provide energy of 50-J level at 351 nm. In addition to the high stability of the energy output, the most valuable of the laser system is the high spatiotemporal beam quality of the output, which contains the uniform square pulse waveform, the uniform flat-top spatial fluence distribution and the uniform flat-top wavefront.
design design frequency conversion frequency conversion laser amplifiers laser amplifiers laser engineering laser engineering laser systems laser systems light propagation light propagation modeling modeling nonlinear optics nonlinear optics optimization optimization wavefront correction wavefront correction High Power Laser Science and Engineering
2016, 4(1): 01000e10
哈尔滨工业大学航天学院可调谐激光技术国家重点实验室, 黑龙江 哈尔滨 150001
将若干路小能量、低功率的激光进行合成，以获得大能量、高功率激光输出的固体激光器，克服了晶体材料体积、热效应及重复频率的限制，近年来得到迅猛发展。基于受激布里渊散射(SBS)技术的激光组束方法作为该领域极其重要的研究方向之一，受到国内外学者的广泛关注。本文综述了基于布里渊放大的串行激光组束的研究进展，分析了共线及非共线组束方法的特性及SBS 组束面临的问题，并对发展方向进行了展望。
激光器 受激布里渊散射 相位共轭 组束 介质 激光与光电子学进展
2015, 52(11): 110004
