We demonstrate experimentally the compression of optical pulses, spectrally broadened by self-phase modulation occurring in the rod of a mode-locked Q-switched YLF laser, with an unchirped, apodized fiber Bragg grating in transmission. The compression is due to the strong dispersion of the Bragg grating at frequencies close to the edge of the photonic bandgap, in the passband, where the transmi...

A short section of photonic crystal fibre has been used for ultra-short pulse compression. The unique optical properties of this novel medium in terms of high nonlinearity and relatively small group velocity dispersion are shown to provide an ideal platform for the standard fibre pulse compression technique used directly on the nanoJoule output pulses from a commercial laser system. We report a...

We demonstrate a novel pulse-compression technique that uses the self-confinement of two-dimensional spatial solitons propagating in bulk nonlinear media to increase the spectral bandwidth followed by a grating pair for recompression. Output pulses of 19-fs duration with 0.6-,J energies are routinely obtained at a repetition rate of 8.6 kHz. Unlike other high-energy compression methods, soliton...

The conventional ultrasonic imaging techniques including the holographic one give a high resolution in angle, but a relatively poor resolution in range, because the resolution in range is obtained only by use of selective focus or parallax useful only with a small focal ratio. This paper presents the principle and some experimental results of new ultrasonic imaging techniques that use a linear ...

We introduce a detailed theoretical, numerical, and experimental study of the effects laser’s phase noise on performance phase-sensitive optical time-domain reflectometry ( $\phi$ -OTDR) sensors that use pulse compression (OPC). Pulse i...

We propose a new, simple approach to enhance the spectral compression process arising from nonlinear pulse propagation in an optical fibre. We numerically show that an additional sinusoidal temporal phase modulation of the pulse enables efficient reduction of the intensity level of the side lobes in the spectrum that are produced by the mismatch between the initial linear negative chirp of the ...

Post-compression of ultra-short laser pulses via self-phase modulation is routinely employed for the generation with optical bandwidths reaching far beyond gain limitations. Although high compression factors can be achieved, compressed typically suffer from temporal quality degradation. We numerically and experimentally analyze deterioration different measures increasing factor show how appropr...

In an ultrahigh speed OTDM system, picosecond or subpicosecond optical data pulses are transmitted through a fibre link. The optical pulses used in such OTDM systems should have the following characteristics: narrow pulsewidth, high extinction ratio, small timing jitter, repetition-rate tunability, and long term stability. Up to now, several techniques have been developed to produce optical pul...

We describe theoretically a method of obtaining pulse compression and simultaneously improving amplification in a degenerate optical parametric amplifier by use of quasi-phase-matched engineered crystals. The scheme combines the possibility of increasing the signal spectral bandwidth that is offered by a degenerate parametric amplifier with the ability of engineered aperiodically poled crystals...