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University of Rochester

1. Gauthier, Daniel Joseph (1960 - ). Instabilities and chaos of laser beams propagating through nonlinear optical media.

Degree: PhD, 2017, University of Rochester

The interaction of two strong laser beams propagating through a nonlinear optical medium is studied theoretically and experimentally. It is shown that this interaction is unstable in that new, intense fields can be generated. An experiment has been performed to investigate the stability characteristics of near-resonant laser beams counterpropagating in a sodium vapor. It is found that the states of polarization of the transmitted waves change abruptly to a value different than the input polarizations when the intensities of the waves are above a well-defined threshold. This result demonstrates that multistability can occur in a cavity-less, nonlinear optical system. </br>When the intensities of the counterpropagating waves are far above the threshold for multistability there are no stable states of the system and the fields fluctuate chaotically in time. This result shows that an optical system can be dynamically unstable due solely to the effects of the nonlinear interaction and the effects of propagation. The attractors describing the dynamical evolution of the system are constructed in phase space and the fractal dimensions and entropies characterizing the attractors are determined. The boundary of the region of instability is measured and is found to depend on the detuning of the laser frequency from the sodium 3S1/2→3P1/2 resonance, on the intensities and polarizations of the input beams, on the atomic number density, and on the buffer gas pressure. </br>The results are in good qualitative agreement with the predictions of a theory that models the nonlinear optical response in terms of the optical Kerr effect. Quantitative agreement is obtained through use of a more detailed model based of the solutions to the density-matrix equations of motion for the atomic system.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gauthier, D. J. (. -. ). (2017). Instabilities and chaos of laser beams propagating through nonlinear optical media. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/32218

Chicago Manual of Style (16th Edition):

Gauthier, Daniel Joseph (1960 - ). “Instabilities and chaos of laser beams propagating through nonlinear optical media.” 2017. Doctoral Dissertation, University of Rochester. Accessed August 19, 2017. http://hdl.handle.net/1802/32218.

MLA Handbook (7th Edition):

Gauthier, Daniel Joseph (1960 - ). “Instabilities and chaos of laser beams propagating through nonlinear optical media.” 2017. Web. 19 Aug 2017.

Vancouver:

Gauthier DJ(-). Instabilities and chaos of laser beams propagating through nonlinear optical media. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Aug 19]. Available from: http://hdl.handle.net/1802/32218.

Council of Science Editors:

Gauthier DJ(-). Instabilities and chaos of laser beams propagating through nonlinear optical media. [Doctoral Dissertation]. University of Rochester; 2017. Available from: http://hdl.handle.net/1802/32218

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