Optical pulse compression of first anti-Stokes order in the multi-frequency Raman generation with the presence of red shifted shoulder
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Date
2018-09-11
Authors
Rahnama, Abdullah
Journal Title
Journal ISSN
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Publisher
University of Waterloo
Abstract
Multi-frequency Raman generation (MRG) is a nonlinear technique to generate intense trains of single-femtosecond pulses. The broad spectrum of different Raman orders which is spread from near-infrared (near-IR) to UV can be used to make single-femtosecond pulses. Albeit, this technique cannot compete with high harmonic generation technique (HHG) in pulse duration, the small frequency spacing between different Raman orders causes to increase the temporal spacing between the pulses, which will eventually increase the pulse power. MRG can be used in many different nonlinear optics applications, which need intense short laser pulses.
To generate short laser pulses, the phase of each Raman order should first be corrected; then, by coherently adding all the different orders, it is possible to get the shortest pulse. We have experimentally observed that the Raman orders can be broadened and have a shoulder in the lower frequency. In the best case, the first anti-stokes bandwidth can be doubled. This effect can cause fewer pulses in the final pulse train, thereby significantly increasing the power of each pulse.
In this thesis, we use a pulse compression system based on prism pairs to compress the first Raman order in the presence and absence of red-shifted shoulder.
We are also interested in how the temporal behavior of red-shifted shoulder and the Raman order will be changed by using our pulse compression system, and generally, how this red-shifting can be used in the generation of intense ultra-short laser pulses.