An acceleration element is proposed for compressing the electron pulse duration in a femtosecond photoelectron gun. The element is a compact metal cavity with curved-shaped walls. An external voltage is applied to the cavity where a special electric field forms in such a way that the slow electrons in the electron pulse front are accelerated more than the fast electrons, and consequently the el...

The use of strained crystals to time-compress chirped x-ray FEL pulses is proposed. The chirped beam diffracts from a crystal in which the strain varies with depth. Low-Z crystals are favored to reduce absorption over the required path lengths and small Bragg angles are favored to increase the diffraction efficiency of the strained crystal. The best compression ratios found for a 230 fs, 0.5% c...

Efficient reflection grisms for pulse-compression and material-dispersion compensation have been designed and demonstrated in a 40 fs, 300 microJ, 5 kHz downchirped pulse amplification system for the first time to our knowledge. A grism design for 800 nm femtosecond laser pulse dispersion compensation applications is realized by using standard, commercial diffraction gratings.

Abstract: The vocalization source level distributions and pulse compression gains are estimated for four distinct baleen whale species in the Gulf of Maine: fin, sei, minke and an unidentified baleen whale species. The vocalizations were received on a large-aperture densely-sampled coherent hydrophone array system useful for monitoring marine mammals over instantaneous wide areas via the passiv...

Gain-switched laser diodes are widely used to generate short optical pulses, which ®nd several applications in optical ®ber measurements and high-speed optical communication systems. Temporal and spectral properties of the gain-switched pulses can be tailored by ®ltering their optical spectrum. Optical ®ltering leads to suppression of frequency chirp and generation of transform-limited pulses. ...

THE SHIVA STAR capacitor bank, a 120 KV parallel bank storing 9.5 MJ with a short circuit current of almost 90 MA, at the AFWL is the world's highest energy, fast capacitor bank. The approximately 3 microsecond short circuit current risetime is shortened by an inductive store/opening switch power conditioning system in which a total inductance of about 10 nH is charged with 35 MA currents. Elec...

The Binary Pulse Compression system installed at SLAC was tested using two klystrons, one with 10 MW and the other with 34 MW output. By compressing 56@ ns klystron pulses into 70 ns, the measured BPC output wss 175 MW, limited by the available power from the two klystrons. This output was used to provide 10GMW input to a 36cell X-band structure in which a lOO-MV/m gradient was obtained. This s...

We report the extension of hollow-core fibre pulse compression to longer wavelengths. High-energy multi-cycle infrared pulses are generated via optical parametric amplification and subsequently broadened in the fibre. 2.5-cycle pulses at the Signal wavelength (1.4 μm) and 1.6-cycle pulses at the Idler wavelength (1.8 μm) in the sub-millijoule regime have been generated. New compression schemes ...

Non-adiabatic pulse compression of cascaded higher-order optical soliton is investigated. We demonstrate high degree compression of pulses with soliton orders N=2, 3, 4, and 5 in two or three nonlinear fibers with different second-order dispersion coefficients. Each fiber length is shorter than half of its soliton period. This compression technique has significant advantages over the widely rep...

In order to evaluate pulse compression for use in phased array weather radar systems, modifications to the Time-Series Weather Radar Simulator have been made which incorporate phase-coding into its functionality. This allows for evaluating the performance of various pulse compression schemes under controlled conditions. Barker-coded pulses with matched and mismatched filters were examined in re...