[10a-M135-1~11] 3.6 超高速・高強度レーザー

▲ [10a-M135-10] BISER control at 150 TW: keV photons and microjoule pulses in the 60-100 eV range

〇Alexander S Pirozhkov¹、Timur Zh. Esirkepov¹、Bruno Gonzalez-Izquierdo¹、Akito Sagisaka¹、Tatiana A. Pikuz^2,7、Zoe E. Davidson³、Koichi Ogura¹、Andreas Bierwage¹、Kai Huang¹、Nobuhiko Nakanii¹、James K. Koga¹、Alexey Ya. Lopatin⁴、Yuji Fukuda¹、David Neely^5,3、Paul McKenna³、Eugene N. Ragozin⁶、Sergey A. Pikuz⁷、Nikolay I. Chkhalo⁴、Nikolay N. Salashchenko⁴、Shinichi Namba⁸、Hiromitsu Kiriyama¹、Masato Koike¹、Kiminori Kondo¹、Tetsuya Kawachi¹、Masaki Kando¹ (1.QST、2.Osaka Univ.、3.Strathclyde Univ.、4.IPM RAS、5.CLF RAL、6.LPI RAS、7.JIHT RAS、8.Hiroshima Univ.)

キーワード：Burst Intensification by Singularity Emitting Radiation (BISER), Relativistic plasma singularities, Coherent x-ray sources

Burst Intensification by Singularity Emitting Radiation (BISER) [1] is a strong intensification (constructive interference, N² effect) of traveling wave emission from singularities produced by multi-stream flows. In particular, bright coherent x-rays [2], [3] are produced by point-like sources, i.e. relativistic plasma singularities driven by high-quality [4] multi-TW femtosecond lasers in gas targets. Here, the density singularities are produced by multi-stream plasma flow resulting from the wake and bow waves [5]. In previous experiments, BISER resulted from relativistic self-focusing, which is a laser beam instability. To improve the stability, we have recently demonstrated a BISER control technique using a 20 TW laser and tailored plasma density, as it was suggested by our simulations with the Particle-In-Cell code REMP [6].

Here we present new experimental results on the BISER control technique obtained with the J-KAREN-P laser [7],[8] at the power of 150 TW. We extended the BISER emission up to the keV spectral region and obtained an order of magnitude enhancement of the photon yield (up to 1 μJ pulse, 10¹¹ photons in the 60-100 eV spectral range within a 10^-2 sr acceptance angle).

We thank the J-KAREN-P laser operation group. We acknowledge financial support from JSPS Kakenhi JP 25390135, JP 26707031, and the QST Director Fund #20.

[1] Pirozhkov, Esirkepov et al Sci. Rep. 7, 17968 (2017).
[2] Pirozhkov et al PRL. 108, 135004 (2012).
[3] Pirozhkov et al New J. Phys. 16, 093003-30 (2014).
[4] Pirozhkov et al Quantum Beam Sci. 2, 7 (2018).
[5] Esirkepov et al PRL 101 265001 (2008).
[6] Esirkepov CPC 135 144 (2001).
[7] Pirozhkov et al Opt. Express 25, 20486 (2017).
[8] Kiriyama et al Opt. Lett. 43, 2595 (2018).