Abstract
Few–cycle short–wave infrared (SWIR) pulses are useful tools for research on strong–field physics and nonlinear optics. Here we demonstrate the amplification of sub–cycle pulses in the SWIR region by using a cascaded BBO–based optical parametric amplifier (OPA) chain. By virtue of the tailored wavelength of the pump pulse of 708 nm, we successfully obtained a gain bandwidth of more than one octave for a BBO crystal. The division and synthesis of the spectral components of the pulse in a Mach–Zehnder–type interferometer set in front of the final amplifier enabled us to control the dispersion of each spectral component using an acousto–optic programmable dispersive filter inserted in each arm of the interferometer. As a result, we successfully generated 0.73–optical–cycle pulses at 1.8 μm with a pulse energy of 32 μJ.
Highlights
Few–cycle short–wave infrared (SWIR) pulses are useful tools for research on strong–field physics and nonlinear optics
They adopted a gas-filled hollow-core fiber (HCF) to broaden the spectral width and performed the division and synthesis of multiple spectral bands in the broadened spectrum to compensate for the dispersion in each band, resulting in the generation of subcycle pulses spanning from the ultraviolet (UV) to near-infrared (NIR) wavelength region
The main issue with an HCF is the limitation of the pulse energy in the sub-mJ range, which is responsible for the scalability of the length and core diameter of an HCF situated in a laboratory with typical dimensions, even though multi-mJ pulses can be generated[10] in a laboratory including an exceptionally long space
Summary
Few–cycle short–wave infrared (SWIR) pulses are useful tools for research on strong–field physics and nonlinear optics. 1234567890():,; The development of laser systems producing a high-intensity single-cycle, or even sub-cycle, pulse has become a worldwide trend in the research fields of ultrashort optics, since it paves the way to numerous advance applications in strong-field physics, such as the generation of isolated attosecond pulses[1], electron acceleration[2], and the study of wave-packet dynamics in atoms and molecules[3]. For example, have demonstrated a waveform synthesizer based on this technique[7,8,9] They adopted a gas-filled hollow-core fiber (HCF) to broaden the spectral width and performed the division and synthesis of multiple spectral bands in the broadened spectrum to compensate for the dispersion in each band, resulting in the generation of subcycle pulses spanning from the ultraviolet (UV) to near-infrared (NIR) wavelength region. The enormous extension of the gain bandwidth in this method enables the formation of an optical transient whose pulse duration is much shorter than one optical cycle at the cost of having to stabilize a long optical path across an optical table in each OPA system with
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