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We experimentally demonstrate group velocity control of 40-fs, 1400-nm pulses through chi(2)-cascaded interactions under large group velocity mismatch. Group delay shifts up to 50 fs are achieved by propagation in a 25-mm-long PPSLT crystal.
An optical delay variable between 0 to 161 ps with GHz bandwidth is demonstrated in an InGaAsP quantum-well semiconductor optical amplifier and modeled by population oscillation and nearly degenerate four-wave-mixing effects for the first time.
Femtosecond time-resolved photoelectron spectroscopy has been used to measure the electron-phonon coupling constant of free size selected Nan+ (n=16-250) clusters. The extrapolated electron-phonon coupling constant of bulk sodium is gB sime 2:3 times 1016 W/m3K.
Cross-phase-modulation-induced pulse delay or advancement in an optical fiber is analyzed. It is shown that XPM and group-velocity mismatch can lead to controllable pulse delay or advancement with negligible frequency shift.
We perform an experimental demonstration of the physical mechanism utilized by most three party secret sharing protocols. By local operations at distant locations, we reduce and restore entanglement in a polarization entangled bipartite qubit system.
As one of the first observations of intra-molecular dynamics using high-order harmonic generation, we impulsively excite vibrations in SF6 and observe oscillations in the intensity of high-order harmonic emission from these molecules.
We demonstrate a dispersion-free split mirror interferometric autocorrelator suitable for measuring pulses with durations from hundreds of attoseconds to tens of femtoseconds and spectral content from the near-UV to near-IR.
We carefully compared pulse characterization methods for few-cycle pulses, using transform-limited sub-7-fs oscillator pulses and chirped amplified pulses. The non-iterative MEFISTO method is found capable of determining all major properties of these challenging test pulses.
A novel approach is used to enhance by nearly two orders of magnitude the conversion efficiency of a 125 nm-coherent source, based on four-wave mixing in room-temperature mercury vapor. Saturation issues are observed and discussed.
The group delay in low-loss, single-mode, 1-mm-long photonic crystal slab waveguides is measured using the phase-shift technique. Slow modes appear a promising approach for compact and massively integrated optical delay lines for signal processing.
We investigate slow light behavior of warm Rb vapor in static magnetic fields. We present data showing two-photon resonance shifts and slow behavior. These results demonstrate feasibility of the previously presented channelization architecture.
Group velocity reduction of sub-nanosecond optical pulses at 1.5 mum is experimentally demonstrated in superstructure Bragg gratings, including Moire and phase-shifted gratings, fabricated on photosensitive fibers by the continuous-writing technique.
We describe a high repetition rate laser driven X-ray source and the optimization of the X-ray generation at low energy level. This source was used in time resolved X-ray diffraction to study the coherent acoustic phonon.
We present a novel application of the spectrally-dispersed two-beam interferometry for the coherent addition of pulses for energy. Our device measures the relative delay of pulse-to-pulse envelope between two laser pulses with few fs accuracy.
A novel differential mode delay (DMD) measurement for a multimode fiber based on optical frequency domain reflectometry (OFDR) is proposed. We obtained high-resolution DMD value of 0.054 ps/m for a commercial MMF by our method.
We present a frequency comb-based, frequency-resolved coherent LIDAR (FReCL) that provides higher performance than that of conventional pulsed range/Doppler LIDARs, dramatically reduces local oscillator timing requirements, and compensates for path dispersion.
We demonstrate slow-down of a modulated light signal in a semiconductor waveguide. Concatenated amplifying and absorbing sections simultaneously achieve both amplification and a controllable time delay at 15 GHz.
We demonstrate a high-resolution dispersion characterization technique for photonic waveguide structures. Direct measurement of 120 mum long photonic crystal waveguides, at a band edge of 1.55 mum, demonstrates group delay dispersion of 0.4 ps2.
We experimentally study reduction of pattern dependent gain and delay for data through SBS-based slow light element by detuning the channel away from the SBS gain peak. The Q factor increases from 1.3 to 11.2.
The height, position, and even spacing of peaks in stepwise and direct multiphoton ionization spectra can be coherently controlled through the time delay or relative phase of two ultrashort laser pulses.
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