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We achieve pulse compression down to 24 fs with 1.1 mJ energy and full carrier-envelope phase (CEP) stabilisation at 1 kHz using a compressor combining prisms and chirped mirrors. We demonstrate that this hybrid compression scheme can be scaled in order to produce CEP-stabilized sub-30 fs pulses at the multi-mJ level.
We demonstrate nonlinear compression of 2.5 ps and 1.2 ps laser pulses at 800 nm wavelength using a 35 m tapered hollow-core photonic bandgap fiber with continuously-decreasing dispersion.
We obtain expressions for the GVD and TOD of reflection grism compressors for compensating material dispersion, and provide useful approximations for practical grism designs.
We exploit second-harmonic generation with large group velocity mismatch to efficiently convert femtosecond pulses into tunable narrowband picosecond pulses. The temporal shape of the picosecond pulses can be tailored by engineering the aperiodically poled crystal.
We demonstrate generation of intense 5 fs pulses using a pressure gradient hollow fiber. The beam after pulse compression could be focused to a diffraction-limited spot with an intensity of 3times1018 W/cm2.
Dispersive pulse compression in a hollow-core photonic bandgap fiber is studied numerically. The limits to peak power for high pulse quality arising from fiber nonlinearities are investigated, along with the validity of approximate scaling relations.
We report on an ultrafast normal dispersion erbium fiber laser generating 10 nJ pulses externally compressed to <5 fs. The impact of spectral filtering on the mode-locking is discussed via phase noise measurements.
We investigate asymptotic pulse shapes arising from a balance of Kerr-type and plasma-mediated self-amplitude modulations. These self-stabilizing soliton-like solutions closely resemble experimental data and constitute the major mechanism for self-compression in femtosecond filaments.
The phase-shift technique for measuring group-delay has novel applications for aligning and commissioning grating compressors and balancing dispersion in large, high-energy petawatt and other complex, chirped-pulse amplifier systems.
We demonstrate a monolithic, i.e. without any free-space coupling, all-single-mode passively modelocked Yb-fiber laser, with direct fiber-end delivery of 364-405 fs pulses of 4 nJ pulse energy using a low-loss hollow-core photonic crystal fiber compression.
A 100-fs ultraviolet pulse is compressed to 12 fs using two types of coherent molecular rotations. Precise control of the time delay between the pulse and the molecular rotations reduced sub-pulses in the temporal profile.
480 fs long pulses with 340 W peak power are generated with an InGaAs diode laser MOPA system and a grating compressor, without stretching the pulses before amplification as required in commonly used CPA systems.
Control of femtosecond laser pulses by deterministically aperiodic photonic multilayer structures is studied both experimentally and theoretically. We demonstrate that quasiperiodic structure with only 2.8 mum thickness varies duration of phase-modulated pulses up to 30%.
We demonstrate that optical pulse compression can be realized by tuning the quality factor of an optical microcavity from a high value to a low value, with tuning time shorter than the photon lifetime.
We generate 8.5 fs pulses at 1.6 mm from an 800-nm-pumped optical parametric amplifier working at degeneracy, employing a deformable mirror compressor. These are the shortest light pulses in this wavelength range.
We present an Er:fiber laser generating two 11 fs pulse trains individually tunable between 1200 and 1300 nm. A relative timing jitter of 43 as is measured after frequency conversion and compression.
Comparison of the performance of an optical parametric amplifier is presented using BBO or BIBO crystals in Type II. The spatio-temporal effect of the parametric pulse-shortening is experimentally investigated with respect to the signal wavelength.
We report a method for generation of ultra-broad bandwidth laser spectrum using self-phase modulation in the argon-filled hollow waveguide and pulse compression with multiphoton intrapulse interference phase scan technique.
We report on a passively mode-locked erbium fiber laser operating in a highly-positive dispersion regime. Highly-chirped pulses with 5.4 ps duration and 8 nm spectral bandwidth are generated. They are compressed down to 757 fs.
We propose a compact Smith-Purcell device can potentially generate hundreds of Watts of THz radiation, based on a train of short electron bunches from an rf photoemission gun at an energy of a few MeV.
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