Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 85 for “"Four wave mixing"”.
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Four-Wave Mixing in Distributed-Feedback Semiconductor Lasers
Finally, we present measurements of dual-pump four-wave mixing in distributed-feedback lasers with two lasing modes for both the parallel and orthogonally polarizations. For the parallel case, we develop a comprehensive model for dual-pump four-wave mixing. The experiments show that the conversion …
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Four-wave mixing with hermite-gauss modes in rubidium vapor
… profile of coherent light generated in a forward four-wave mixing (FWM) process. We are interested in investigating how the transverse structure of the incident beams, more specifically of the Hermite-Gauss (HG) modes, is transferred to the generated signal in this nonlinear process. For the …
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Optical Limiting and Degenerate Four-Wave Mixing in Novel Fullerenes
… methods, optical limiting and degenerate four-wave mixing, are employed to study the nonlinear optical properties of various novel fullerenes structures. Optical limiting refers to decreased transmittance of a material with increased incident light intensity. Detailed measurements of the …
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Wavelength conversion by four wave mixing in passive InGaAsP/InP waveguides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Probing the Dissociation of the Rubidium Dimer by Wavepackets and Parametric Four-Wave Mixing
Embargo set by: Seth Robbins for item 82331 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Characterization of II-VI semiconductor nanostructures by low wavenumber raman- and four-wave-mixing spectroscopy
Es ist bekannt, dass räumlich eingeschränkte Ladungsträger in niederdimensionalen Halbleitern zur Verstärkung optischer und elektronischer Eigenschaften solcher Nanostrukturen beitragen. Die Physik des "Quantum Confinements" ist trotz umfangreicher Nachforschungen noch immer nicht völlig …
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Four-Wave Mixing Techniques Applied to the Investigation of Non-Adiabatic Dynamics in Polyatomic Molecules
… within the framework of time-resolved, four-wave mixing spectroscopy were developed that allowed for the dynamic as well as the energetic aspects of vibronic coupling in non-radiative transitions of polyatomic molecules to be addressed. This was achieved by utilizing the influence of …
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Investigation of Degenerate Four -Wave Mixing and Polarization Spectroscopy for Quantitative Measurements in Combustion Environments
The application of DFWM and PS for quantitative concentration measurements was investigated experimentally by measuring lineshapes and signal intensities in well-characterized hydrogen/air flames. Resonances in the A2Sigma +-X2pi (0,0) band of hydroxyl (OH) were probed with both perturbative and …
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Quantum beat observations in rubidium vapor
… 7S and 5D_{5/2} energy states were observed by a four-wave mixing process. The difference frequency between the 5D–5P_{3/2} and the 5P_{3/2}–5S transitions was also observed for interpulse delays up to 180 ps. The temporal evolution of the beat amplitude indicates the existence of a …
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Nonlinear optical effects in nematic liquid crystals
… in nematic liquid crystals including degenerate four-wave mixing are presented. The optically induced Freedericksz transition which is essential for these effects is also described. Experimental investigations are performed using a homeotropically aligned MBBA thin film. Good agreement is …
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Holographic lasers
… their cavity by phase conjugation. A fibre based four-wave mixing scheme is investigated but no experimental evidence of any phase conjugation is observed.
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Impacts of higher-order dispersion coefficients and dispersion fluctuations on one-pump fiber optical parametric amplifier
Four-wave mixing (FWM) is a nonlinear effect in optical fiber which is useful for fiber optical parametric amplifiers (FOPA). The performance of FOPA i.e. parametric gain, amplification bandwidth, and saturation power are reliant on the efficiency of the FWM process. The random dispersion …
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Non-linear optical properties of semiconductor nano-structures for slow light and wavelength conversion
… the utilization of quantum dots for wavelength conversion via four-wave mixing. Our results show that quantum dots with only a single bound state are more efficient than both quantum wells and quantum dots with a large number of excited states. We compare experimentally quantum dots …
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Ultrafast Dynamics and Nonlinear Interactions in Alkali Atoms and Diatomics
… D states of the Cesium dimer and to study atomic wavepackets and nonlinear effects in Rubidium and Potassium. Two color, pump-probe techniques have been used to probe the time evolution of wavepackets in the B, C, and D rovibrational levels of Cs$\sb2$. The temporal history of the wavepacket is …
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Geometric manipulation of light : from nonlinear optics to invisibility cloaks
… two different manipulations of electromagnetic waves governed by macroscopic Maxwell's equations. One is frequency conversion of such waves using small intrinsic material nonlinearities. We study conversion of an input signal at frequency w1 to frequency Wk due to second or third harmonic …
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Holographic laser resonators
… can be produced by the process of degenerate four-wave mixing inside a gain medium. In this scheme two mutually coherent beams overlap within a population inverted region of a laser amplifier and the subsequent interference pattern between them spatially hole burns a grating into the gain. The …
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Multidimensional fiber quantum light sources and their applications
… quantum light sources. We study spontaneous four-wave mixing processes in optical fibers that can create photon pairs correlated in spatio-spectral degrees of freedom. Utilizing spatial light modulators, we show control over individual spontaneous four-wave mixing processes through precise …
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Intensyvių femtosekundinių šviesos bangų paketų sklidimo Kero terpėse laikinis ir erdvinis charakterizavimas /
… temporal, spatial and spectral mapping of light wave-packet dynamics during the nonlinear propagation in transparent media, and enabled to observe and make accurate quantitative evaluation of the ultrafast change of medium properties. By means of high temporal (20 fs) and spatial (1 μm) …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… spaced five channels based on the complex waveguide Bragg gratings and the multimode interferometer (MMI). A more than 40 dB extinction ratio is achieved in all five channels and the device is shown to be low loss (<1dB on chip loss) and broadband (>200nm 3-dB bandwidth). We also study a …
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