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We demonstrate how Fourier Nonlinear Optics elegantly merges the simplicity of linear optics with the power of conventional nonlinear optics to achieve the decoupling of frequencies, amplitudes and phases in nonlinear processes.
FNO enables deep UV pulse shaping through direct phase transfer of conventionally shaped NIR pulses at 830nm to their 4th harmonic. We demonstrate first time pulse characterization with a transient grating FROG at 207nm.
Starting from a 100kHz picosecond Yb laser, we derive tunable 10–15fs visible pulses for intrapulse difference frequency generation of potentially CEP stable, few-cycle IR pulses as the seed source for a subsequent FOPA chain.
Recent results on parametric amplification in the Frequency domain are presented followed by elaborating future designs of all Yb based high repetition rate FOPA chains.
The powerful technique of optical parametric amplification (OPA) experienced a huge advance with the invention of optical parametric chirped pulse amplification (OPCPA) and later noncollinear OPA. In this paper, we describe a radically different approach of performing parametric interaction in the frequency domain instead of the time domain. The frequency domain is reached via optical Fourier transformation,...
By employing hollow-core fiber compression using a stretched flexible fiber, we achieved 2-cycles pulses centered on 1.8μm with more than 5mJ energy per pulse.
800nm, nJ level pulses are amplified >2.000 times in a single 2mm BBO crystal, pumped by picosecond 400nm pulses. Experiments evidence that the picosecond pulse contrast within the pump window remains unchanged upon amplification.
The universal dilemma gain narrowing (the more one amplifies a laser pulse, the longer gets its duration) for fs amplifiers which prevents ultra high power lasers from delivering few-cycle pulses. This problem is overcome by a new amplification concept: Fourier plane Optical Parametric Amplifier — FOPA. It enables simultaneous up-scaling of peak power and amplified spectral bandwidth and can be operated...
Employing parametric amplification in the Fourier domain rather than in time domain circumvents phase mismatch and damage threshold limitations of laser amplifiers and enabled CEP stable, 1.43mJ, sub-two cycle pulses at 1.8μm.
A significant enhancement of the terahertz generation efficiency via two-color laser-induced air ionization, up to 10−3, is observed with increasing pump wavelength. Terahertz peak fields up to 4.4 MV/cm were obtained using 400 μJ pulse energy.
We describe a method for electric-field characterization of few-cycles pulses with wavelengths from mid-infrared to the THz region, based on electric-field induced second harmonic spectrograms. The method is demonstrated with single cycle THz pulses.
Stereo above threshold ionization in xenon was studied with CEP stable few-cycle IR laser pulses. Strong CEP dependence was revealed both for directly ionized and rescattered electrons for pulse durations from 2 to 5 cycles.
Interferometric CEP control in a white light seeded optical parametric amplifier is demonstrated by relative phase shifting between white light and pump beam prior to their difference frequency generation, resulting in CEP controlled Idler pulses.
The generation of isolated 80 attosecond laser pulses has almost reached its physical limitation when using established Ti:Sa schemes at 800 nm of the driving field [1]. Further shortening of attosecond pulse duration utilizing high harmonic generation (HHG) can be achieved by using few cycle pulses at longer wavelengths because the HHG cut-off shifts towards higher photon energies proportional to...
We report sub-mJ carrier envelope phase (CEP) stable 1.6 cycle pulses at 1.8μm. With those pulses, we have obtained 160eV cut-off in argon at an intensity of 1.4×1014W/cm2 using the process of high harmonic generation.
A simple scheme for generating 0.4 mJ 11.5 fs pulses at 1.8 μm is presented. Optical parametric amplified pulses were spectrally broadened in a hollow-core fiber and subsequently compressed by utilizing linear propagation through bulk material.
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