サブエクサワット級を目指した超高強度レーザーの概念設計「激光エクサ」と基盤技術研究の現状

摘要

A 50 PW, 10 fs ultrahigh-peak-power laser has been conceptually designed. The system is based on optical parametric chirped pulse amplification. A 250 J DPSSL and a flash-lamp-pumped kJ laser, and a broadband OPCPA chain with partially deuterated KDP (pDKDP) crystals are designed as new repeatable pump sources and a few-cycle pulse amplifier, respectively. The pDKDP has been successfully grown at several different deuteration ratios. A broadband grating with high diffraction efficiency in the compressor is under designing.