Matter and Radiation at Extremes, Volume. 5, Issue 6, 065201(2020)
Development of low-coherence high-power laser drivers for inertial confinement fusion
Fig. 2. Broadband frequency tripling with two triplers for the OMEGA facility.
Fig. 3. Phase-matching curve for frequency tripling of chirp pulses. Reprinted with permission from Raoult
Fig. 5. Schematic of the ISI method. Reprinted with permission from Zhao
Fig. 6. (a) Demonstration of the echelon-free ISI method. Reprinted with permission from Lehmberg
Fig. 7. Optical frequency as a function of time for different light sources: (a1) high-coherence pulse; (b1) chirped pulse and transform-limited pulse; (c1) phase-modulated pulse; (d1) instantaneous broadband pulse. (a2), (b2), (c2), and (d2) are the corresponding frequency–phase diagrams.
Fig. 8. Schematic of the low-coherence front-end system. AWG, arbitrary waveform generator; AM, amplitude modulator; OC, optical circulator; SM LD, single-mode laser diode; WDM, wavelength division multiplexer; AOM, acoustic optical modulator; FC, fiber collimator; M, mirror; HWP, half-wave plate; P, polarizer; BC, birefringent crystal; MMLD, multimode laser diode. Reprinted with permission from Rao
Fig. 9. Illustration of the pulse shapes that can be generated by our system: (a) square pulse; (b) high-contrast pulse; (c) exponential pulse; (d) spectra of different pulse shapes. Reprinted with permission from Rao
Fig. 10. (a) Spectrum without spectral control. (b) Spectrum with a nearly flat top. (c) Saddle-type spectrum for a Nd:glass amplifier. (d) Temporal profiles of the spectra in (a)–(c). Reprinted with permission from Rao
Fig. 11. Schematic of the high-gain preamplifier: FE, front end; RA, repetitive amplifier; SA, single-shot amplifier; FA, fiber amplifier; HWP, half-wave plate; FR, Faraday rotator; PC, Pockels cell; PBS, polarizing beam splitter; BF, birefringent filter; P, polarizer; M, mirror; BE, beam expander; LCSM, liquid crystal spatial modulator; PSF, spatial filter; Φ, Nd:glass rod (diameter, mm); EOS, electro-optical switch. Reprinted with permission from Cui
Fig. 12. (a) Temporal and (b) spectral profiles of the light in the single-shot amplifier. The “sa” label indicates the saddle-shaped spectrum. Reprinted with permission from Cui
Fig. 13. Visibility of interference fringes at different locations. The dots are experimental results, and the curves are fitting results. FE, front end, RA, repetitive amplifier, SA, single-shot amplifier. Reprinted with permission from Cui
Fig. 14. Schematic layout of the main amplifier. SF, spatial filter, M, mirror, L, lens.
Fig. 16. (a) Temporal profile and (b) output energy of main amplifier.
Fig. 17. (a) Near-field pattern and (b) far-field profile in the main amplifier section.
Fig. 18. Results of SHG in the low-coherence laser facility. Reprinted with permission from Ji
Fig. 19. Near fields of the fundamental wave (a) and the second harmonic (b), and the corresponding far fields of the fundamental wave (c) and the second harmonic (d). (a) and (c) are reprinted with permission from Cui
Fig. 20. Experimental and simulation results for second-harmonic efficiency vs fundamental wave energy when a KDP crystal is used.
Fig. 21. Temporal intensity distribution of second-harmonic conversion measured by a streak camera with a resolution of 11 ps.
Fig. 23. Focal spots obtained using ISI + LA with smoothing times (a)
Fig. 24. (a) Experimental focal spot using partial ISI + LA with broadband light. (b) Theoretical result. Reprinted with permission from Li
Fig. 25. (a) Phase distribution of a CPP for a 200
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Yanqi Gao, Yong Cui, Lailin Ji, Daxing Rao, Xiaohui Zhao, Fujian Li, Dong Liu, Wei Feng, Lan Xia, Jiani Liu, Haitao Shi, Pengyuan Du, Jia Liu, Xiaoli Li, Tao Wang, Tianxiong Zhang, Chong Shan, Yilin Hua, Weixin Ma, Xun Sun, Xianfeng Chen, Xiuguang Huang, Jian Zhu, Wenbing Pei, Zhan Sui, Sizu Fu. Development of low-coherence high-power laser drivers for inertial confinement fusion[J]. Matter and Radiation at Extremes, 2020, 5(6): 065201
Category: Inertial Confinement Fusion Physics
Received: Mar. 30, 2020
Accepted: Jun. 29, 2020
Published Online: Nov. 24, 2020
The Author Email: Gao Yanqi (liufenggyq@siom.ac.cn)