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| Home > Publications database > Experimental and Theoretical Studies in Non-Linear Optical Applications: Fiber Oscillators, Regenerative Amplifiers, Simulations on White-Light Generation |
| Book/Report/Dissertation / PhD Thesis | PUBDB-2015-05316 |
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2015
Verlag Deutsches Elektronen-Synchrotron
Hamburg
Report No.: DESY-THESIS-2015-050
Abstract: Compact and stable ultrafast laser sources for electron diffraction experiments are the first step in accomplishing the dream experiment of producing a molecular movie. This thesis work focuses on developing new robust laser sources to enable arbitrary scaling in laser repetition rate, pulse energy, duration and stability as needed to provide sufficient integrated detected electrons for high quality diffraction patterns that can be inverted to real space movies. In chapter 2, the construction of a novel stable and high power stretched pulse fiber oscillator outputting 300mW at 31 MHz and compressible pulses to below 90fs will be described. Chapter 3 will describe the construction of a solid-state regenerative amplifier that was developed to achieve pulse energies above 1mJ with 0.40 mJ already achieved at 1 kHz. Novel simulation techniques were explored that aided the construction of the amplifier. Chapter 4 derives a new, fast and powerful numerical theory that is implemented for generalized non-linear Schrodinger equations in all spatial dimensions and time. This new method can model complicated terms in these equations that outperforms other numerical methods with respect to minimizing numerical error and increased speed. These advantages are due to this method’s Fourier nature. A simulation tool was created, employing this numerical technique to simulate white-light generation in bulk media. The simulation matches extremely well with published experimental data, and is superior to the original simulation method used to match the experiment. The use of this tool enables accurate calculations of continuum or white light generation as needed for different experimental protocols and serves as the primary input to generate wide bandwidth coherent light. This work has solved the problem of predictably designing continuum generation within targeted wavelength ranges. This information is needed as part of an overall scheme in laser source development to coherently control molecules in the IR region to provide a new photo trigger source for molecular reaction dynamics that will be essential to explore chemical reaction dynamics in general.
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