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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 1389 for “"pulses"”.
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Multidimensional Spectroscopy With Femtosecond Pulses
… peak power, and bandwidth of 50 femtosecond pulses gives them capabilities to extract information unattainable with first order techniques. Despite the resolution difficulty due to the bandwidth, it is demonstrated both theoretically and experimentally on two contrasting spectral regions that …
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Toward single-cycle optical pulses
Single-cycle optical pulses, the never-before-achieved regime, have a great potential for attosecond science and phase-sensitive nonlinear optics. To achieve single-cycle optical pulses by active synchronization, three major steps are required. Firstly, two very stable and broadband mode-locked …
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Near-field imaging with terahertz pulses
… with spatial resolution of few microns using THz pulses with spectral content of 120 to 1500 microns. In the present study, the principle of the probe operation as well as the probe design and characteristics are described. The probe performance is related to effective detection of radiation …
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Correlation Detection of Sub-Nanosecond Optical Pulses
Made available in DSpace on 2014-12-08T22:24:49Z (GMT). No. of bitstreams: 1 7021076.pdf: 5450149 bytes, checksum: 6d558573938e7deba6ad92ced98a33c6 (MD5) Previous issue date: 1970
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Propagation of electromagnetic pulses in the ionosphere
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1942.
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Generation and amplification of short laser pulses.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Electrical Engineering, 1972
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Modeling generation and characterization of attosecond pulses
… EUV sources that can produce attosecond pulses. These pulses can serve as a probe to resolve atomic attosecond dynamics and image atomic orbitals and molecular motion. Due to high spatial and temporal coherence, high-order harmonic radiation can also be used to seed free electron lasers, …
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Ultrafast Ionisation Dynamics Induced by Short Proton Pulses
This work presents experimental results obtained using the TARANIS laser at Queen’s University Belfast of transient absorption spectroscopy of dynamics induced by bursts of radiation, predominantly ions, from high-power laser-solid interactions. The absolute measurement of proton bursts as short as …
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New method for generating short optical pulses, A
Includes bibliographical references.
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All-optical electron acceleration with ultrafast THz pulses
… than grating-based TPF for short (~100 fs) pulses. Finally, we reuse the residual pump to obtain a recycled eciency around half to a quarter that of the original. This reduced eciency can be linked to spatio-spectral distortions in the residual pump, and we characterize these distortions to …
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Annealing Cryogenically Irradiated High TemperatureSuperconductors with Current Pulses
… This experiment focuses on sending 400A pulses through an irradiated HTS tape to identify the optimal duration for critical current recovery. Using a cryogenic proton irradiation facility capable of applying current pulses as high as 2000A and as short as 100 ns, we found that a 400A …
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Optical excitation of bulk semiconductors by phase-locked pulses.
… of bulk semiconductors by phase-locked pulses.
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Adaptive control of electronic excitation utilizing ultrafast laser pulses
… during and after the interaction of matter with pulses of femtosecond laser radiation. The experiments presented here were performed in the gas phase and involve one atomic and several model molecular systems. Absorption of femtosecond laser radiation by these systems induces an electronic …
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Applications of femtosecond laser pulses in refractive eye surgery /
… manipulated, is limited by the absorption of UV pulses in nonlinear optical crystals; this rate can be increased by implementing the adaptive manipulation of the tuning angle of the nonlinear crystal; (2) using the fundamental nIR radiation of the Yb:KGW solid-state laser, the corneal LASIK flap …
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Semiconductor seeded fibre amplified sources of ultra short pulses
… VECSELs are a compact source of ultra-short pulses at GHz repetition rates, with pulse lengths as short as 190 fs being generated directly from the laser. The VECSEL is a power scalable device offering spectral versatility through band gap engineering of semiconductor gain …
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Coherent Control of Molecular Dynamics with Shaped Femtosecond Pulses
… feedback-controlled shaping of ultrashort laser pulses with respect to both establishment of its technical prerequisites and its application to suitable model systems. The feedback loop has been tested using a simple optimization experiment with known outcome; then it was applied to experiments …
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