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We demonstrate a 10-GHz SESAM-modelocked Yb:CALGO laser delivering 240 fs at 0.64 W from a straight cavity containing a fanout-apodized-PPLN crystal, which provides soliton modelocking via cascaded second-order nonlinearities and a defocusing-lens effect suppressing Q-switching-damage.
We present a high-power mid-infrared OPCPA system generating ultra-broadband pulses centered at 2.2 μm with a bandwidth supporting pulse compression to 15 fs. We achieve a record average power of 9.1 W at 100 kHz.
In aperiodically poled quasi-phase-matching (QPM) crystals, parametric down-conversion (PDC) can generate very broadband pulsed squeezed light. This is because each part of the crystal will generate squeezed light at a different frequency [1]. But the emission will be thus inhomogeneously broadened, and one requires special measures to eliminate the chirp accompanying the pulses. This can be done...
Non-dipole effects in strong-field ionization are observed at high laser intensities and/or long wavelengths that both lead to high kinetic energies of the photoelectrons [1]. At longer wavelengths, the electron is influenced by the magnetic field component of the laser field even at moderate intensity [2]. In cases where the Coulomb field can be neglected, the magnetic field component is responsible...
High-power and few-cycle mid-IR laser sources are of great interest for their application in strong-field physics and attosecond science [1, 2]. We present an ultra-broadband optical parametric chirped-pulse amplification system (OPCPA) achieving 9.1 W of average power at a repetition-rate of 100 kHz, with an optical bandwidth centred at 2.2 μm and spanning 1000 nm. To the best of our knowledge, this...
Ultrafast laser sources are opening new industrial and scientific applications. In particular, SESAM-modelocked thin-disk laser (TDL) oscillators are promising candidates to replace complex amplifier systems by compact high-power oscillators combining high pulse energy and MHz repetition rate. Record-high average powers up to 275 W and peak powers up to 66 MW have been achieved with SESAM-modelocked...
We study strong-field ionization with elliptically polarized mid-IR pulses beyond the long-wavelength limit of the dipole approximation. Rescattering creates a sharp structure in 3D photoelectron momentum distributions influenced by non-dipole effects.
We generate offset-free gigahertz frequency combs tunable from 2.75 to 3.8 μm by using PPLN waveguides for 30-dB-amplification of a supercontinuum generated in a Si3N4 waveguide by the same Yb:CALGO-laser that pumps the OPA process.
We demonstrate soliton modelocking of a Yb:CALGO laser via cascaded second-order nonlinearities whereby the second-harmonic is adiabatically excited/de-excited in an apodized-fanout-PPLN crystal. We obtain 100-fs pulses at 540 MHz with 760 mW average power.
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 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 present soliton modelocking based on cascading of quadratic nonlinearities using an LBO crystal in a SESAM-modelocked Yb:CaGdAlO4 laser cavity, enabling pulse formation in the positive GDD-regime, reaching 114-fs pulses at 1.1-W average output power.
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 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 LiB3O5/Yb:CaGdAlO4, 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.
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.
Quasi-phasematching (QPM) has been utilized for a wide variety of nonlinear-optical devices, for applications such as ultrafast optics and quantum optics [1, 2]. A key advantage of this technology is its high degree of engineerability, enabled by the freedom in fabricating QPM gratings with a wide range of periods and lengths. This enables, for example, pulse compression via second-harmonic generation,...
In an OPO near degeneracy, intensity and spectral oscillations at sub rep-rate frequencies are investigated numerically and verified experimentally. These oscillations are explained by the existence of two coherent frequency combs with different offset frequencies.
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