The influence of a spatial prof'de in the gain, which can be caused by saturat ion o f the med ium by the beam, is studied on the amplification properties of the beam. It is found that the amplifying medium is about twice as efficiently depleted as can be expected on basis of a plane-wave approximation. This means that the saturat ion-parameter values as they have been deduced in the past are w...

The control and stability of the carrier-envelope phase of few-cycle pulses are crucial issues in attoscience. This project reports on a novel few-cycle mid-infrared source based on optical parametric chirped pulse amplification with 100 kHz repetition rate at a wavelength of 3.2μm and a pulse duration of 67 fs. Due to the design of the source it is supposed to be intrinsically passively carrie...

Microwave parametric amplifiers operating at the quantum noise limit have become indispensable tools for a range of cryogenic technologies. These are typically constructed from nonlinear Josephson junctions, which ability to amplify high-power signals. This study reports device based instead on weakly kinetic inductance intrinsic superconducting film niobium titanium nitride. The amplifier offe...

Abstract The space-time (ST) wave packet, a type of light source with many anomalous behaviors, has already found application in weak-field optics, however its generation method limits energy and therefore strong-field optics. Here we show that the type-I collinear optical parametric amplification (OPA) is natural amplifier for ST because it, spectrum (i.e., angle-dependent phase-matching spect...