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University of Rochester

1. McMackin, Ian Matthew. The dynamics of multimode, standing-wave, CW dye lasers.

Degree: PhD, 2017, University of Rochester

Experimental investigations of multimode, standing-wave, cw dye lasers have been carried out. The optical spectrum of a three-mirror-cavity dye laser was found to evolve by discrete transitions with increasing pump power, between spectra composed of three stable modes and spectra composed of many modes whose amplitudes fluctuate strongly. The intensities versus time of individual modes of the multimode laser were measured. For pump powers where the spectrum consisted of modes with strongly fluctuating amplitudes we found that the intensities of individual modes have a correlation time that decreases with increasing pump power. In addition the fluctuations were found to be deterministic, possibly deterministically chaotic. This rules out quantum noise as the origin of the fluctuations, a mechanism that had been assumed in many previous studies. The results of the experiments are compared with numerical simulations of this laser, using a semiclassical model based on third-order laser theory, which includes spatial hole burning and spontaneous emission noise. The behavior of the optical spectrum and the fluctuations of single-mode intensities are well modeled for low pump powers. The modeling indicates that four-wave mixing and spatial hole burning are responsible for the discrete transitions in the optical spectrum, and that four-wave mixing drives the strong fluctuations of individual mode intensities. In an experimental investigation of the two-mirror-cavity dye laser we have found evidence that the mode phases spontaneously lock to minimize the oscillations of the total intensity at frequencies which are even multiples of the spatial hole burning frequency. This phase locking behavior is qualitatively modeled by computer simulations. The intensities of the individual modes of the two-mirror laser exhibit a pulsing behavior near threshold, in which the average time that a mode is off can exceed the average time that it is on. The correlation time of the individual-mode intensities is found to decrease with increasing pump power, indicating that the intensity fluctuations of the individual modes may be deterministic. The pulsing behavior of the individual modes is not understood and at present not modeled by the computer simulations of the mode behavior of the two-mirror laser. </br>The modeling indicates that four-wave mixing and spatial hole burning are responsible for the discrete transitions in the optical spectrum, and that four-wave mixing drives the strong fluctuations of individual mode intensities. In an experimental investigation of the two-mirror-cavity dye laser we have found evidence that the mode phases spontaneously lock to minimize the oscillations of the total intensity at frequencies which are even multiples of the spatial hole burning frequency. This phase locking behavior is qualitatively modeled by computer simulations. The intensities of the individual modes of the two-mirror laser exhibit a pulsing behavior near threshold, in which the average time that a mode is off can exceed the average…

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

APA (6th Edition):

McMackin, I. M. (2017). The dynamics of multimode, standing-wave, CW dye lasers. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/32210

Chicago Manual of Style (16th Edition):

McMackin, Ian Matthew. “The dynamics of multimode, standing-wave, CW dye lasers.” 2017. Doctoral Dissertation, University of Rochester. Accessed December 18, 2017. http://hdl.handle.net/1802/32210.

MLA Handbook (7th Edition):

McMackin, Ian Matthew. “The dynamics of multimode, standing-wave, CW dye lasers.” 2017. Web. 18 Dec 2017.

Vancouver:

McMackin IM. The dynamics of multimode, standing-wave, CW dye lasers. [Internet] [Doctoral dissertation]. University of Rochester; 2017. [cited 2017 Dec 18]. Available from: http://hdl.handle.net/1802/32210.

Council of Science Editors:

McMackin IM. The dynamics of multimode, standing-wave, CW dye lasers. [Doctoral Dissertation]. University of Rochester; 2017. Available from: http://hdl.handle.net/1802/32210

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