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Dicke narrowing dominates over collisional dephasing in gas phase H2 up to 500 Torr, permitting the efficient production of a record 70,000 cm-1 broad Raman sideband spectrum by molecular modulation at room temperature.
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.
Sub-10-fs visible pulses allow real time detection of coherent phonons in single-walled carbon nanotubes. Nonlinear coupling between radial breathing (250 cm-1) and the carbon-stretching (1600 cm-1) modes is experimentally observed and theoretically modeled.
Stimulated-Brillouin-Scattering (SBS) provides passive Q-switching of a Nd:YAG-laser. Mode-coupling was actively supported by an AOM. Numerical simulations based on spectrally resolved rate equations including SBS-Stokes-shift and mode-locking explain special spectral features of this laser.
In this paper we propose a new technique that enables optical single sideband generation for optical subcarrier multiplexing. A high sideband suppression ratio is achieved across the full RF spectral band.
We theoretically show that the effects of the carrier-envelope-phase is significant even in the multiphoton ionization regime with an essential difference on the phase-dependent dynamics compared with the tunneling ionization regime.
We propose and numerically demonstrate a resolution enhancement technique for patterns acquired by microscopes and oscilloscopes based on spatial or temporal periodic modulation of an object, transmission and restoration of the input spectrum by parts.
We show that the giant Kerr nonlinearity in the regime of electromagnetically induced transparency in vapor can give rise to the formation of Thirring-type spatial solitons, which are supported solely by cross-phase modulation.
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.
A simple non-iterative electric field retrieval method using a sinusoidally driven optical phase modulator is proposed. The method is validated by demonstrating accurate characterization of picosecond pulses used in telecommunication.
Utilizing soft-lithography based nanofluidics and silicon nanophotonics we demonstrate ultracompact tunable spectral filtering. Liquid based addressing and high refractive index modulation of a single row of holes within a planar photonic crystal is demonstrated.
We investigate wavelength conversion by cross-phase modulation in the presence of strong dispersion and two photon absorption in highly nonlinear singlemode As2Se3 fiber, achieving conversion over a span of 30 nm.
We used a thermo-electrically cooled, continuous-wave, quantum cascade laser with wavelength modulation spectroscopy for the detection of nitric oxide at sub-part-per-billion volume (ppbv) . The minimal detectable absorption achieved is 9 times 10-9 cm-1Hz-frac12.
We present experimental and theoretical investigation of modulation instability process in large normal dispersion regime leading to visible continuum generation. The influence of the input power and polarization state of the pump wavelengths are analyzed.
Preliminary measurements of the electron spin relaxation rate (T1) in charged GaAs quantum dots are made using a nonlinear optical phase-modulation spectroscopy technique. T1 approaches 46 musec at zero magnetic field.
We investigate experimentally and theoretically self-phase modulation and group velocity dispersion induced spectral broadening of picosecond pulses in silicon wires. Already for very low peak powers the limit for dense wavelength demultiplexing is reached.
We model slow-light propagation in an active semiconductor waveguide in the large modulation depth regime. Distortion from higher harmonics is countered by filtering and the regenerating properties of the device further increase the modulation depth.
We proposed and experimentally demonstrated polarization shift keying (PolSK) label over vestigial sideband carrier suppressed return-to-zero (VSB-CSRZ) payload for 43 Gb/s all-optical label switching network. This is a candidate technique for the next generation optical network.
Direct-detection differential polarization-phase-shift keying is experimentally demonstrated at 10 Gsymbol/s, in which polarization-phase symbols are differentially decoded by using optical interferometric demodulation and electrical multilevel decision without the need of dynamic polarization control.
We report GHz modulation of bipolar cascade VCSELs. The VCSELs incorporate a reverse-biased tunnel junction and p-doped oxide aperture for each triple-quantum well active region. These devices exhibit frequency responses greater than 4 GHz.
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