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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 341 for “"femtosecond"”.
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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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Femtosecond Transient Imaging
… with free space hardware experiments using a femtosecond laser and a picosecond accurate sensing device. The ability to infer the structure of hidden scene elements, unobservable by both the camera and illumination source, will create a range of new computer vision opportunities.
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Femtosecond pulsed laser deposition
… (PLD) technique. The first technique is femtosecond PLD, whereby the laser used to ablate the target has a significantly higher peak intensity and shorter pulse duration as compared to conventional nanosecond lasers more commonly used for PLD. Experiments have been conducted on the growth …
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Femtosecond gain-index coupling in femtosecond nonlinearity measurements of InGaAsP diode laser amplifiers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Multidimensional Spectroscopy With Femtosecond Pulses
… duration, 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 …
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High intensity femtosecond enhancement cavities
To produce extreme ultraviolet radiation via high harmonic generation (HHG) in rare gases, light intensities in excess of 1014 W/cm 2 are required. Usually such high intensity are obtained by parametric amplification of laser pulses, which in turn reduces the pulse repetition rate to a few kHz. …
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Femtosecond carrier dynamics in AlGaAs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Femtosecond laser writing in transparent materials
… in high index bismuth borate glass by femtosecond laser direct writing. Broadening of the transmitted light source by as much as 500 nm was demonstrated through a waveguide with a length of 1.8 cm. Finally, passive waveguide components such as Y-splitters and directional couplers have …
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Determining molecular chirality with femtosecond LASERs
More than 200 years since its first discovery Chirality remains one of the most challenging aspects of analytical chemistry. As chiral enantiomers share almost all physical properties they are only distinguishable through interaction with another chiral system, be it chiral molecules or circularly …
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Compact Femtosecond Lasers for Multiphoton Imaging
Multiphoton imaging currently is one of the main development directions in Laser Scanning Microscopy. A simplified way to assess suitability of a given laser for MPI applications is a figure of merit (FOM) approach based on peak power and average power of the particular excitation laser used. The …
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Femtosecond nonlinearities in InGaAsP diode lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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High-Energy YB-Doped Femtosecond Fiber Lasers
… energy and spectral bandwidth of the mode-locked femtosecond fiber lasers. I have focused on studying the impact of the parameters of the saturable absorber and the bandwidth of the lumped spectral filter on the temporal and spectral profiles of the pulse. Therefore, I developed two models that …
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Femtosecond nonlinearities in AlGaAs diode laser amplifers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Smith Purcell radiation from femtosecond electron bunches
We present theoretical and experimental results from a Smith-Purcell radiation experiment using the electron beam from a 17 GHz high gradient accelerator. Smith- Purcell radiation occurs when a charged particle travels above a periodic grating structure. The electron beam consists of a train of 15 …
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Femtosecond pulse generation in solid-state lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Femtosecond-Laser-Enabled Fiber-Optic Interferometric Devices
During the past decades, femtosecond laser micro-fabrication has gained growing interests owing to its several unique features including direct and maskless fabrication, flexible choice of materials and geometries, and truly three-dimensional fabrication. Moreover, fiber-optic sensors have …
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Femtosecond optical parametric oscillators for the mid-infrared
… with the generation and characterisation of femtosecond pulses in the near and mid-infrared spectral regions. The three optical parametric oscillators which were constructed were synchronously- pumped by a self-modelocked femtosecond Ti:sapphire laser. Noncollinear critical birefringent …
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Femtosecond quantum control and adaptive polarization pulse shaping
Adaptive Femtosekunden-Quantenkontrolle hat sich in den letzten Jahren als eine sehr erfolgreiche Methode in vielen wissenschaftlichen Gebieten wie Physik, Chemie oder Biologie erwiesen. Eine Vielzahl von Quantensystemen und insbesondere Moleküle, die eine chemische Reaktion durchlaufen, sind durch …
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Femtosecond pulse generation in surface-emitting semiconductor lasers
In this thesis I report significant advances towards the goal of stable ultrashort pulse generation in mode-locked optically pumped vertical external-cavity surface-emitting lasers (VECSELs). Continuous wave VECSELs were first designed as a type of semiconductor laser capable of producing high …
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Optimization of sub-10 femtosecond titanium sapphire lasers
… an easy to use and robust system to produce femtosecond pulses for use in experiments. Towards this end I will discuss the issues involved in perfecting Kerr-lens mode locked Ti:sapphire laser technology and present experimental results on a new type of output coupler designed using chirped …
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