DPSSL pumped 20-TW Ti:sapphire laser system for DD fusion experiment

8th International Conference on Inertial Fusion Sciences and Applications

Sekine, T.^1 ; Hatano, Y.^1 ; Takeuchi, Y.^1 ; Kawashima, T.^1

Development Bureau Hamamatsu Photonics, K.K., Kurematsu-cho 1820, Nishi-ku, Shizuoka Hamamatsu

431-1202, Japan^1

关键词: Diode pumped solid state laser;    Far-field patterns;    Laser induced plasma;    Near field patterns;    Nonlinear optical crystal;    Off-axis parabolic mirrors;    Pulse compressors;    Ti:sapphire laser systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012104/pdf
DOI  :  10.1088/1742-6596/688/1/012104

来源: IOP

【 摘 要 】

A diode-pumped solid-state laser (DPSSL) pumped 20-TW output Ti:sapphire laser system has been developed. A diode-pumped Nd:glass laser with output energy of 12.7 J in 527 nm was used as a pump source for a 20-TW Ti:sapphire amplifier. A CeLiB6O10 nonlinear optical crystal was used as a frequency doubler of the Nd:glass DPSSL[1]. Figure 1 shows typical output pulse energy of the 20-TW amplifier as a function of pumping energy and a near field pattern. A 1.65 J pulse energy was obtained by 4.5 J pump energy. The amplified seed pulse is compressed to typically 60 fs as shown in Fig. 1 by a vacuumed pulse compressor with 80% of transmissivity. Encircled energy ratio, into a circled with 8 μm diameter area, of far field pattern focused by off-axis parabolic mirror with F# of 3 is numerically evaluated to 40% at TW class output condition. Then focal intensity would reach to 1018W/cm2. This all- DPSSL system contributes for stable and continual investigation of laser induced plasma experiment. We have succeeded continual and high efficient generation of DD fusion neutron from CD nano-particles by cluster fusion scheme using the 20-TW laser. A yield of ∼105 neutrons per shot was stably observed during continuous 100 shots with repetition rate of 0.1Hz.