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Energy-scalable single-burst attosecond emission at kiloelectronvolt photon energies
Kaito Nishimiya, Eiji J. Takahashi
Attosecond soft-X-ray pulses at kiloelectronvolt photon energies would provide direct access to the L-edges of transition metals, enabling element-specific studies of charge, spin,…
Complex-gate all-optical frequency-resolved optical gating for ultrabroadband isolated attosecond pulse characterization
Minshuang Xia, Kaito Nishimiya, Dianhong Dong +2
We experimentally demonstrate all-optical frequency-resolved optical gating (AO-FROG) for the characterization of ultrabroadband isolated attosecond pulses (IAPs) generated by a mi…
Broadband gain characterization of Co:MgF for mid-infrared femtosecond pulse amplification
Natsuki Kanda, Kaito Nishimiya, Eiji J. Takahashi
The broadband gain characteristics of Co:MgF were investigated to assess its potential as a gain medium for ultrashort-pulse amplification around the 2 m spectral region. Si…
Towards intense single-digit attosecond pulses with a 100-mJ-class mid-infrared sub-cycle laser
Kaito Nishimiya, Rambabu Rajpoot, Eiji J Takahashi
The duration of isolated attosecond pulses created via high-order harmonic generation is determined by the number of optical cycles in the driving laser. Achieving shorter attoseco…
Advances in dual-chirped optical parametric amplification
Kaito Nishimiya, Eiji J. Takahashi
High-energy infrared lasers have enabled the generation of strong field phenomena, and among such phenomena, high-order harmonic generation (HHG) from gases has enabled attosecond-…
Perturbed three-channel waveform synthesizer for efficient isolated attosecond pulse generation and characterization
Dianhong Dong, Hushan Wang, Bing Xue +5
The generation of gigawatt-class isolated attosecond pulses (IAPs) is vital for attosecond pump-probe experiments. In such experiments, the temporal duration of IAPs must be determ…
Systematic analysis of an attosecond pulse generation by a sub-cycle laser field
Rambabu Rajpoot, Eiji J. Takahashi
We investigated the influence of sub-cycle driving fields on high-order harmonic generation (HHG), with a focus on intrinsic chirp, carrier-envelope phase (CEP), and number of lase…
Octave-spanning supercontinuum coherent soft X-ray for producing a single-cycle soft X-ray pulse
Kaito Nishimiya, Feng Wang, Pengfei Lan +1
This study demonstrates the potential to generate a soft X-ray single-cycle attosecond pulse using a single-cycle mid-infrared pulse from the advanced dual-chirped optical parametr…