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We investigate coherent excitonic coupling in asymmetric double quantum wells with varying barrier thickness using optical two-dimensional Fourier transform spectroscopy. The coupling is isolated and characterized as cross peaks in two-dimensional spectra.
Absorption cross-sections of the first excited singlet and triplet states of an asymmetric pentaazadentate porphyrin-like cadmium complex have been measured using Z-scans employing both 7.1-ns and 30-ps pulse widths, each at multiple pulse energies.
A simple optical arrangement for phase sensitive detection of DFWM to characterize the real and imaginary parts of chi(3) is demonstrated. A processable polyacetylene sample is characterized at a wavelength of 1.5 mu(3)m using this technique.
We present a heterodyne Z-scan technique to obtain resonant nonlinearities (n2) of Kerr-like media. From phase measurements we determine both signal and magnitude of n2. Results are presented for a ruby sample.
Small optical third-order nonlinearities of waveguides like hollow-core photonic crystal fibers are characterized using a femtosecond four-wave-mixing scheme. Possible perturbations arising from acoustical and optical phonons are suppressed by low-frequency operation.
Nonlinear optics of surface plasmon polaritons is shown to exhibit qualitatively new features associated with shortness of plasmon wavelength and tight localization of plasmon polariton field near curved metal-dielectric interfaces.
We present a microscopic theory for the nonlinear reflection of semiconductor Bragg structures. Our theoretical results showing ultrafast optical gain complement recent experimental observations and allow for the identification of the underlying many-particle processes.
An ultrabroad infrared continuum can be produced using optical parametric generation (OPG) in quasi-phasematched GaAs. Spectra over an octave wide, spanning 4.5 to 10.7 microns, measured 20 dB down from the peak, have been observed.
We demonstrate DPSK wavelength multicasting using four-wave mixing in a 64-m dispersion-flattened photonic crystal fiber. Six multicast channels operating at 10 Gb/s are obtained at a 200 GHz spacing.
We demonstrate a simple method to generate optical pulse train with tunable pulsewidth at 10 Gb/s using four-wave mixing in 1.9 m bismuth based highly nonlinear fiber.
Polaron dephasing processes are investigated using far-infrared degenerate four wave mixing. Long (~80 ps) dephasing times are measured and a clear change from phonon-mediated to Auger-mediated dephasing is observed as the dot carrier population increases.
By combining time magnification and heterodyning, the electric field of optical sources is temporally characterized in a single shot. This principle is used to characterize various sources at 1.5 micron, including data-encoded telecommunication sources.
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