Data Set Used
Microorganisms frequently colonize the nectar of angiosperm species. Though capable of altering a suite of traits important for pollinator attraction, few studies exist that test the degree to which they mediate pollinator foraging behavior. The objective of our study was to fill this gap by assessing the abundance and diversity of yeasts associated with… (More)
We present a comprehensive study of the physics and design of OPCPA based on chirped quasi-phase-matching, identifying subtle parametric processes occurring in these devices, and how they were addressed in our latest mid-IR OPCPA result.
We present a study of features in photoelectron momentum distributions from strong-field ionization of noble gases for few-cycle pulses in the mid-infrared regime and assign characteristics to their classical and quantum mechanical origin.
We present a proof-of-principle of broadband, non-collinear quasi-phase-matching in a hybrid OPCPA system. It employs a combination of quasi-phase-matching and group-velocity-matching in a MgO:PPLN delivering 3.4-μm, 17.2-μJ, 43.1-fs pulses at 50 kHz repetition-rate.
We analyze frequency comb generation in CW-pumped singly-resonant optical parametric oscillators using cascaded second-order nonlinearities. We explain experimental results, trade-offs and current limits on performance, and examine scaling towards broader bandwidths in the future.
We present soliton modelocking based on cascading of quadratic nonlinearities using an LBO crystal in a SESAM-modelocked Yb:CaGdAlO<sub>4</sub> laser cavity, enabling pulse formation in the positive GDD-regime, reaching 114-fs pulses at 1.1-W average output power.
We present an ultra-broadband OPCPA system operating at 3.4 μm delivering 41.6-fs pulses. The average output power is currently 600 mW, corresponding to 12 μJ of pulse energy at a repetition rate of 50 kHz.
We consider SESAM soliton-modelocking via cascaded quadratic nonlinearities in the normal dispersion regime. We explain the theory, perform a design study for our experimental implementation in LiB<sub>3</sub>O<sub>5</sub>/Yb:CaGdAlO<sub>4</sub>, and present detailed numerical simulations of this laser.
Ionization with a few-cycle mid-infrared laser field results in an electron momentum shift directed opposite to the beam pressure. This result represents a breakdown of the dipole approximation, in contrast to previous observations of photon-momentum-transfer.
Second-harmonic generation of ultrashort pulses in the sufficiently chirped quasi-phase-matching (QPM) gratings is shown to obtain conversion efficiency approaching 100% with increasing pump intensities, and the wide bandwidth of the pulses is also preserved.