Speaker
Katsuhiro Ishii
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.2032.pdf
Velocity measurement of laser-induced shock using a spectral domain
interferometer and a chirped pulse laser
K. Ishii1, A. Sunahara2, Y. Mori1, R. Hanayama1, S. Okihara, Y. Kitagawa1, T. Sekine3,
Y. Takeuchi3, T. Watari3, T. Kurita3, H. Kimura3, Y. Kabeya3, Y. Mizuta3, Y. Kato3,
T. Hioki4, T. Motohiro4, H. Azuma5, Y. Sentoku6, E. Miura7,
A. Iwamoto8, and H. Sakagami8
1
The Graduate School for the Creation of New Photonics Industries, Japan,
2
Purdue Univ., USA,
3
Hamamatsu Photonics, K. K., Japan,
4
Nagoya University, GREMO, Japan,
5
Aichi Synchrotron Radiation Center In “Knowledge Hub Aichi”, Japan,
6
Institute for Laser Technology, Japan,
6
Institute of laser engineering, Osaka Univ., Japan
7
National Institute of Advanced Industrial Science and Technology, Japan
8
National Institute of Fusion Science, Japan
In the fast ignition scheme inertial fusion, shock waves driven by ultra-intense lasers are one
of candidates for the core heating. To measure the velocity and pressure of shock wave, we
have developed a spectral domain interferometer using a part of the chirped pulse amplified
(CPA) laser of 800 nm wavelength, which we call the probe beam [1]. The laser pulse with
the pulse width of 110 fs and the peak intensity of 1.73x1017 W/cm2 irradiates 150
μm-thickness solid Zirconia plate, which is coated with 20 nm-thick vanadium on the surface,
The probe beam is illuminated from the backside of the plate. Figure 1 shows a measured
interference fringe at the moment of the laser irradiation. From the fringe analysis, the
velocity of shock wave is estimated to be 4×105 cm/s. In the presentation, we compare the
velocity of shock wave with the numerical result obtained from the two-dimensional
radiation hydrodynamic code (STAR2D) and discuss the pressure of the shock wave.
References
[1] K. Ishii et al., Proc SPIE,
10089, 1008916 (2017).
Fig. 1 Interference fringe at the moment of the laser irradiation to a solid
Zirconia plate. It is measured using a spectral domain interferometer and a
chirped pulse laser.
