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We present compression of 22-mJ, 90-fs mid-infrared pulses centered at 3.9 μm down to a duration 33 fs via spectral broadening in a noble-gas-filled capillary and subsequent dispersion compensation in bulk. Large 1-mm core diameter of 3-meter long capillary assures over 60% throughput and allows avoiding of unwanted ionization.
Few-cycle high peak power mid-IR sources are required for strong field applications, such as driving HHG in the keV range [1] and high efficiency THz generation [2]. In order to expose target to a peak field without causing excessive ionization, ultrashort pulses consisting of a few-cycles are needed. Parametric sources based on KTA crystals have been successfully used for the generation of multi-mJ...
We report on 3.2 μm pulse post-compression via spectral broadening in hollow core capillary filled with noble gas. The mid-IR input pulses are generated in a femtosecond OPA based on KTA crystals, which delivers 6 mJ, 80 fs, 3.2 μm CEP-stable idler pulses. Pulses were spectrally broadened in a 3 meter long differentially pumped hollow-core capillary with ∼50% transmission and a statically filled 50...
We report on Kagome fiber based self-compression of 100 μJ IR pulses to single cycle duration and demonstrate HHG in an integrated scheme which allows a compact isolated attosecond XUV source implementation above 50 eV.
We present experimental and numerical progress in the development of nonlinear directional couplers based on multicomponent glass photonic crystal fibre. The first part of the paper reports a multi-wavelength nonlinear switch, operating in ultralong wavelength optical communication band, based on a special square lattice dual-core photonic crystal fibre excited with femtosecond pulses. The soliton-fission...
We demonstrate sub-cycle gigawatt peak power pulses self-compressed by optical shock waves in a simple manner based on gas-filled kagome hollow-core photonic crystal fiber.
Optical parametric chirped pulse amplification (OPCPA) is rapidly gaining ground as an approach to generate intense few-cycle pulses and reach IR wavelength ranges [1]. However, the high OPA gain has its negative side: for a bell-shaped intensity profile of the pump pulse/beam the unsaturated gain varies exponentially with intensity, resulting in an effective temporal/spatial filter. Here we demonstrate...
In many fields of empirical science, theories have been proposed arguing that behavioral relationships change over time. There are many possible ways in which parameters of regression models are assumed to change. With better understanding of how parameters change, estimation and testing procedures for various structural changes can be developed. This paper uses an exploratory way by augmenting the...
We discuss a new video analysis approach for coherent key-frame extraction and object segmentation. As two basic units for content-based video analysis, key-frame extraction and object segmentation are usually implemented independently and separately based on different feature sets. Our previous work showed that by exploiting the inherent relationship between key-frames and objects, a set of salient...
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