[18p-E205-1~17] 3.6 Ultrashort-pulse and high-intensity lasers

▲ [18p-E205-4] Multi-TW sub-3-cycle pulses at 1.7 µm by DC-OPA: Towards GW-scale water window isolated attosecond pulse

〇(P)Lu Xu¹, Yuxi Fu¹, Katsumi Midorikawa¹, Eiji J Takahashi¹ (1.Attosecond Science Research Team, Extreme Photonics Research Group, RAP, RIKEN)

Keywords:parametric amplification

Recently, strong-field laser science has been experiencing a shift towards the use of infrared (IR) driving wavelengths, especially with high demand on high pulse energy. However, conventional optical parametric amplification (OPA) can generate only mJ class IR fs pulses. Recently, we circumvented the energy scaling difficulty in conventional OPA and obtained 100 mJ class IR pulses with multicycle durations using a dual-chirped optical parametric amplification (DC-OPA) method [1]. In this work, we aim to further shorten the pulse duration to a few-cycle for generating intense soft x-ray isolated attosecond pulses. Employing a BiBO crystal-based DC-OPA system, we obtained 32 mJ pulse energy with spectrum (1.3-2.1 µm) supporting sub-3-cycle pulse duration.