Characterization of high-harmonic emission from ZnO up to 11  eV pumped with a Cr:ZnS high-repetition-rate source

Vampa, Giulio; Vasilyev, Sergey; Liu, Hanzhe; Mirov, Mike; Bucksbaum, P. H.; Reis, David A.

doi:10.1364/ol.44.000259

Cited by 11 publications

(6 citation statements)

References 25 publications

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“…1. The design of the driving laser is very similar to those described in [21,23]. In short, we couple 1.3 W output of a 3-cycle Kerr-lens mode-locked Cr 2 :ZnS oscillator to a single-pass Cr 2 :ZnS amplifier at a full repetition rate f R 78 MHz.…”

Section: Remarkable Examples Include Supercontinuum Generation (Scg)mentioning

confidence: 99%

“…The source is enclosed in a dust-tight 18 00 × 24 00 case and purged with dry air. The improvements over the system from [23] include: slightly increased spectral bandwidth of the oscillator, better dispersion control between the oscillator and amplifier stages, and better spatial mode matching. Also, we equipped the oscillator with a commercial kit for f R stabilization (based on a phase-locked loop controller) and used a low-noise singlefrequency EDFL to pump the oscillator.…”

Section: Remarkable Examples Include Supercontinuum Generation (Scg)mentioning

confidence: 99%

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Super-octave longwave mid-infrared coherent transients produced by optical rectification of few-cycle 25-μm pulses

Vasilyev

Moskalev

Smolski

et al. 2019

Optica

Self Cite

114

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Femtosecond laser sources and optical frequency combs in the molecular fingerprint region of the electromagnetic spectrum are crucial for a plethora of applications in natural and life sciences. Here we introduce Cr 2-based lasers as a convenient means for producing super-octave mid-IR electromagnetic transients via optical rectification (or intra-pulse difference frequency generation, IDFG). We demonstrate that a relatively long, 2.5 μm, central wavelength of a few-cycle Cr 2 :ZnS driving source (20 fs pulse duration, 6 W average power, 78 MHz repetition rate) enabled the use of highly nonlinear ZnGeP 2 crystal for IDFG with exceptionally high conversion efficiency (>3%) and output power of 0.15 W, with the spectral span of 5.8-12.5 μm. Even broader spectrum was achieved in GaSe crystal: 4.3-16.6 μm for type I and 5.8-17.6 μm for type II phase matching. The results highlight the potential of this architecture for ultrafast spectroscopy and generation of broadband frequency combs in the longwave infrared.

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Section: Remarkable Examples Include Supercontinuum Generation (Scg)mentioning

confidence: 99%

Section: Remarkable Examples Include Supercontinuum Generation (Scg)mentioning

confidence: 99%

Super-octave longwave mid-infrared coherent transients produced by optical rectification of few-cycle 25-μm pulses

Vasilyev

Moskalev

Smolski

et al. 2019

Optica

Self Cite

114

View full text Add to dashboard Cite

show abstract

“…202100368 Unlike atoms and molecules, the nonlinear condensed matter provides higher efficiency and enables us to compress the volume of experimental setup. Although HHG from condensed matter has been extensively investigated both theoretically [29][30][31][32][33][34][35][36][37][38][39] and experimentally, [40][41][42][43][44][45][46] the mechanism is still under debate due to the complicated elementary processes. In particular, two-dimensional (2D) monolayers show interesting behaviors: HHG pumped with laser pulses with in-plane polarization behaves similar to the case of solid state medium, while atomic-like HHG is observed for out-of-plane polarized pumping.…”

Section: Introductionmentioning

confidence: 99%

High‐Harmonic Generation from 2D Monolayer Electrides

Kim

Choe

2021

Annalen der Physik

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This work reports high-harmonic generation (HHG) from 2D monolayer electrides investigated by using ab-initio approach based on time-dependent density functional theory, mainly focusing on monolayer Mg 2 N. Due to low ionization energy and wide potential well, they exhibit distinctively high HHG efficiency and high cutoff energy for out-of-plane pumping, although they also show atomic-like behavior. For out-of-plane pumping with a peak intensity of 40 TW cm −2 at 1550 nm, high harmonics up to 120th order are generated with efficiency 4 orders-of-magnitude higher than monolayer h-BN. For pump intensity below the direct above-threshold ionization (ATI) regime, the tunneling from the ground state and ATI from one-or two-photon resonant state simultaneously contribute to HHG. In the other subnitride monolayers of alkaline earth with larger atomic sizes (Ca 2 N and Sr 2 N), further higher harmonic generation efficiencies are obtained due to the lower work functions and wider potential wells. For in-plane pumping, the intraband transition is the major source of the HHG due to the metallic in-plane responses. The presented results will attract great attention due to the peculiar HHG signature from fundamental aspects and pave the way of obtaining coherent extreme ultraviolet (EUV)/soft-X-ray with high efficiency by using monolayer electrides.

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“…Despite the recent development of all-solid-state mid-IR laser sources, it is still in early stages of combining the advanced mid-IR lasers and strong-field nonlinear optics. So far, only a handful of reports discuss SCG and other nonlinear optics in bulk crystals pumped by advanced mid-IR solid-state lasers [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

Nam

Nagar

Dempsey

et al. 2021

High Pow Laser Sci Eng

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We present experimental and numerical investigations of high-energy mid-infrared filamentation with multi-octave-spanning supercontinuum generation (SCG), pumped by a 2.4 μm, 250 fs Cr:ZnSe chirped-pulse laser amplifier. The SCG is demonstrated in both anomalous and normal dispersion regimes with YAG and polycrystalline ZnSe, respectively. The formation of stable and robust single filaments along with the visible-to-mid-infrared SCG is obtained with a pump energy of up to 100 μJ in a 6-mm-long YAG medium. To the best of the authors’ knowledge, this is the highest-energy multi-octave-spanning SCG from a laser filament in a solid. On the other hand, the SCG and even-harmonic generation based on random quasi-phase matching (RQPM) are simultaneously observed from the single filaments in a 6-mm-long polycrystalline ZnSe medium with a pump energy of up to 15 μJ. The numerical simulations based on unidirectional pulse propagation equation and RQPM show excellent agreement with the measured multi-octave-spanning SCG and even-harmonic generation. They also reveal the temporal structure of mid-infrared filaments, such as soliton-like self-compression in YAG and pulse broadening in ZnSe.

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Characterization of high-harmonic emission from ZnO up to 11 eV pumped with a Cr:ZnS high-repetition-rate source

Cited by 11 publications

References 25 publications

Super-octave longwave mid-infrared coherent transients produced by optical rectification of few-cycle 25-μm pulses

Super-octave longwave mid-infrared coherent transients produced by optical rectification of few-cycle 25-μm pulses

High‐Harmonic Generation from 2D Monolayer Electrides

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

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