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 67 for “"Pulse Shaping"”.
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An integrated optics pulse shaping device
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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Femtosecond quantum control and adaptive polarization pulse shaping
… durch speziell geformte, Femtosekunden-Laserimpulse kontrolliert worden. Diese Methode erlaubt es, nicht nur das Quantensystem zu beobachten, sondern einen Schritt weiterzugehen und aktive Kontrolle über quantenmechanische Dynamik zu erlangen. In diesem Schema werden Interferenzphänomene im …
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Femtosecond optical pulse shaping and multiple-pulse femtosecond spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Investigation into mid-infrared pulse shaping using an optical parametric oscillator
… indirect spectral transfer of shaped pulses from the near to mid-infrared via the use of an optical parametric oscillator. It was shown that good spectral fidelity of transfer can be achieved by making suitable adjustments to the OPO. The issues affecting the transfer process are …
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Femtosecond pulse shaping for enhanced optical imaging and control of cells
… explores the possibility of using temporal pulse shaping in order to improve the selectivity with which optically sensitive molecules can be activated. It is demonstrated that linearly chirped pulses and dark pulses have the potential to improve selectivity by exclusively controlling the …
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Pulse Shaping Filter Design and Interference Analysis in UWB Communication Systems
… as follows. First, a 2-stage optimal UWB pulse shaping filter design procedure is proposed, which not only satisfies the FCC transmission spectral masks but also suppress the multiple access interference (MAI). The major advantages of the proposed joint optimization method are: (1) it has …
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Pulse shaping techniques for mega ampere current on Atlas pulsed power machine
Atlas is one of the world's largest pulsed power systems designed by Los Alamos National Laboratory (LANL) to perform high energy density experiments in support of weapon-physics and basic research programs. The current pulse generated by Atlas is a damped sinusoid that rises to nearly 30 MA in 6 …
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Theoretical Study of Laser Beam Quality and Pulse Shaping by Volume Bragg Gratings
… of stretching and compressing of short light pulses by the chirped volume Bragg gratings (CBG) is reviewed based on spectral decomposition of short pulses and on the wavelength-dependent coupled wave equations. The analytic theory of diffraction efficiency of a CBG with constant chirp and …
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Nonlinear optical microscopy and spectroscopy by pulse shaping of a coherent fiber supercontinuum
… thesis, multimodal nonlinear optical imaging by pulse shaping of a coherent fiber supercontinuum is demonstrated and applied to breast cancer research. The supercontinuum is generated in an all-normal-dispersion fiber, achieving a spectrum spanning the optical biological window with high …
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Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
This thesis develops powerful new methods for shaping femtosecond laser pulses in two dimensions and explores their application to coherent control of propagating lattice excitations and degenerate four-wave mixing spectroscopy. Pulse shaping in two dimensions is achieved by manipulating the …
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Using narrowband pulse-shaping to characterize polymer structure and dynamics : Deathstar GHz spectroscopy
(cont.) The validation of this technique for probing amorphous polymer structure and dynamics lays the ground for further study of heterogeneous materials, such as nanocomposites and block copolymers.
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Investigation of electrically tunable diode-based nonlinear transmission lines as pulse shaping networks for microwave systems at megawatt peak powers
The pulsed power community is actively concentrating on the miniaturization of high-power microwave (HPM) systems, driven by the growing demand for applications on oceanic vessels, satellites, and unmanned aerial vehicles. One promising approach to achieve system miniaturization involves utilizing …
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Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper
… benzene and the development of a new ultraviolet pulse shaper are presented. The non adiabatic non radiative decay process of benzene in its first excited has been determined using pump probe time resolved photoelectron spectroscopy. An ultrafast oscillation has been found at the onset of the …
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Architecture for ultra-low power multi-channel transmitters for Body Area Networks using RF resonators
… tunable matching network in the PA also enables pulse-shaping for spectrally efficient modulation. A prototype transmitter supporting 3 FBAR-oscillator channels in the 2.4GHz ISM band was designed in a 65nm CMOS process. It operates from a 0.7V supply for the RF portion and 1V for the digital …
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Mechanisms of Intramolecular Vibrational Energy Redistribution and a Method for Coherent Control
… is dramatically slowed through the used of laser pulses that are easily produced with available pulse shaping equipment.
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Control and detection of complex fields in spatio-temporal optical systems
… space-time fields are presented. Holographic pulse-shaping techniques for recording information on ultra-fast space-time fields are analyzed. Spatial programming of reflection holograms in one dimension controls the temporal shape of a diffracted field. Space-time fields are produced by …
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Superconducting qubit readout pulse optimization using deep reinforcement learning
… increase the complexity of optimal readout pulse shapes, requiring computationally intensive methods to discover high-fidelity pulse shapes. In this thesis, we extend existing readout optimization methods to work in multi-qubit environments and present a new pulse shaping optimization module …
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High power pulsed ytterbium doped fibre lasers and their applications
The aim of my project is to develop pulsed Ytterbium (Yb) doped fibre master oscillator power amplifier (MOPA) systems seeded by semiconductor lasers. I was principally focused on two specific projects aligned to sponsored programs of research within the ORC pulsed fibre laser group: the first …
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Bit error simulation of FSK, BPSK, and pi/4 DQPSK in flat and frequency-selective fading mobile radio channels using two-ray and measurement- based impulse response models
… for FSK, BPSK, and Ï /4 DQPSK with Nyquist pulse shaping in indoor and outdoor, flat and frequency-selective fading channels. The BER performance of Ï / 4 DQPSK using the data rate and the pulse shaping requirement in the U.S. Digital Cellular Standard are studied. BER results for high data …
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