Thesis Abstract
Construction and Characterization of a Computer Controlled Acousto-optic Modulator based Femtosecond Pulse Shaper
Fourier pulse shaping of femtosecond pulses has lately gained a lot of
im-portance , because of its varied applications in areas such as optical
WDMAand CDMA communication systems, non-linear optics, biomedical applica-tions,
spectroscopy, coherent control and so on. In this thesis , I reportthe
construction and characterization of a "`Computer controlled femtosec-ond folded
geometry pulse shaper using an Acousto-optic modulator". Wedemonstrate
independent amplitude and phase modulation of femtoseondlaser pulses through
computer control. The construction of a folded geom-etry AOM pulse shaper, the
necessary modi cations to theory for foldedgeometry, and the experiments with
amplitude and phase modulation areexplained in detail. The implementation of a
genetic algorithm is discussed,which, when implemented on the setup, can
arbitrarily shape a pulse to op-timize a certain quantity, for example,
two-photon uorescence in a sample.I also propose a feedback loop implementation
to achieve any desired pulseshape. I improved the acquisition and analysis speed
of the pulse charac-terization technique "STRUT" by almost 8-10 times, which has
made theimplementation of the feedback loop practically feasible.
Contact me to know my current interests.
These include only those published in our lab.
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Applying Genetic Algorithm Optimization to a Folded Geometry Acousto-Optic Modulated Spatial Pulse Shaper.
A. Nag, P. A. Chaphekar, and D. Goswami, Review of Scientific Instruments 81(1), 013101 (2010)
[Abstract]
[PDF]
[BibTeX]
Abstract: A folded geometry acousto-optic modulator spatial pulse shaper has been designed for shaping individual pulses from a high power amplified laser. The design preserves the capability of computer programmable amplitude and phase modulation of femtosecond laser pulses. An additional application of genetic algorithm optimization approach for compressing a stretched pulse is also demonstrated for such a pulse shaper. Spectrally and temporally resolved optical gating technique is used to characterize the shaped pulses.
BibTeX: @article{nagApplyingGeneticAlgorithm2010,
title = {Applying Genetic Algorithm Optimization to a Folded Geometry Acousto-Optic Modulated Spatial Pulse Shaper},
author = {Nag, Amit and Chaphekar, Prasad A. and Goswami, Debabrata},
date = {2010-01-01},
journaltitle = {Review of Scientific Instruments},
shortjournal = {Review of Scientific Instruments},
volume = {81},
number = {1},
pages = {013101},
issn = {0034-6748},
doi = {10/ddkc77},
url = {https://aip.scitation.org/doi/abs/10.1063/1.3276682},
urldate = {2019-08-14}
}
-
Applying Genetic Algorithm Optimization to a Folded Geometry Acousto-Optic Modulated Spatial Pulse Shaper.
A. Nag, P. A. Chaphekar, and D. Goswami, Review of Scientific Instruments 81(1), 013101 (2010)
[Abstract]
[PDF]
[BibTeX]
Abstract: A folded geometry acousto-optic modulator spatial pulse shaper has been designed for shaping individual pulses from a high power amplified laser. The design preserves the capability of computer programmable amplitude and phase modulation of femtosecond laser pulses. An additional application of genetic algorithm optimization approach for compressing a stretched pulse is also demonstrated for such a pulse shaper. Spectrally and temporally resolved optical gating technique is used to characterize the shaped pulses.
BibTeX: @article{nagApplyingGeneticAlgorithm2011,
title = {Applying Genetic Algorithm Optimization to a Folded Geometry Acousto-Optic Modulated Spatial Pulse Shaper},
volume = {81},
issn = {0034-6748},
url = {https://aip.scitation.org/doi/abs/10.1063/1.3276682},
doi = {10/ddkc77},
number = {1},
journaltitle = {Review of Scientific Instruments},
urldate = {2019-08-14},
date = {2010-01-01},
pages = {013101},
author = {Nag, Amit and Chaphekar, Prasad A. and Goswami, Debabrata}
}
