The advent of chirped-pulse amplification in the 1980s and femtosecond Ti: sapphire lasers
in the 1990s enabled transformative advances in intense laser–matter interaction physics …

High-order harmonic generation (HHG) in gases is frequently used nowadays to produce
attosecond pulses and coherent radiation in the visible-to-soft X-ray spectral range. HHG in …

The manipulation of solid states using intense infrared or terahertz light fields is a pivotal
area in contemporary ultrafast photonics research. While conventional circular polarization …

Reflecting crystal and electronic structures, high harmonic generation (HHG) in solids show
intriguing behaviors that are absent in isotropic gases, and are expected to be novel light …

We investigate the characteristics of high harmonics (HHs) unique to the nonperturbative
nonlinear regime. We show that the polarization state of HHs generated from GaAs changes …

We experimentally elucidate the origin of the anomalous Hall conductivity in a three-
dimensional Dirac semimetal, Cd 3 As 2, driven by circularly polarized light. Using time …

We generate 1.7-cycle and 35-µJ pulses at a 1-MHz repetition rate by using two-stage
multiple plate continuum compression of Yb-laser pulses with 80-W average input power. By …

The electromagnetic response of Dirac semimetals in the infrared and terahertz frequency
ranges is attracting growing interest for potential applications in optoelectronics and …

Using broadband (12–45 THz) multi-terahertz spectroscopy, we show that stimulated
Rayleigh scattering dominates the transient optical conductivity of cadmium arsenide, a …

We report the first observation of the spin Hall conductivity spectrum in GaAs at room
temperature. Our terahertz polarimetry with a precision of several μ rad s resolves the …