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You searched for +publisher:"Michigan Technological University" +contributor:("Ramy El-Ganainy"). Showing records 1 – 3 of 3 total matches.

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Michigan Technological University

1. Rahman, Ashfiqur. Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array.

Degree: MS, Department of Physics, 2017, Michigan Technological University

We explore a type of synthetic saturable absorber based on quantum-inspired waveguide arrays or generally named as Jx array. We demonstrate the interplay of optical Kerr nonlinearity and Jx array can be used to observe saturable absorber phenomenon. More interestingly, we show that the boundary between on and off regime can be very sharp. The threshold optical intensity that marks this abrupt phase transition and its steepness can be engineered by varying the number of the guiding elements. The practical feasibility of these structures as well as their potential applications in laser systems and optical signal processing are also discussed. Advisors/Committee Members: Ramy El-Ganainy.

Subjects/Keywords: Waveguide; Coupled Mode Theory; Saturable Absrober; Kerr Nonlinearity; Optics

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

APA (6th Edition):

Rahman, A. (2017). Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array. (Masters Thesis). Michigan Technological University. Retrieved from http://digitalcommons.mtu.edu/etdr/537

Chicago Manual of Style (16th Edition):

Rahman, Ashfiqur. “Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array.” 2017. Masters Thesis, Michigan Technological University. Accessed October 17, 2019. http://digitalcommons.mtu.edu/etdr/537.

MLA Handbook (7th Edition):

Rahman, Ashfiqur. “Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array.” 2017. Web. 17 Oct 2019.

Vancouver:

Rahman A. Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array. [Internet] [Masters thesis]. Michigan Technological University; 2017. [cited 2019 Oct 17]. Available from: http://digitalcommons.mtu.edu/etdr/537.

Council of Science Editors:

Rahman A. Synthetic Saturable Absorber Using Non-Uniform Jx Waveguide Array. [Masters Thesis]. Michigan Technological University; 2017. Available from: http://digitalcommons.mtu.edu/etdr/537


Michigan Technological University

2. Teimourpour, Mohammad Hosain. QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING.

Degree: PhD, Department of Physics, 2017, Michigan Technological University

In this thesis, quantum inspired symmetries including Parity-Time (PT) symmetry and Supersymmetry (SUSY) have been studied in the context of non-Hermitian engineered laser systems. This thesis starts with a short review of semiconductor lasers theory in second chapter, followed by an introduction to quantum inspired symmetries: PT symmetry and SUSY in optics and photonics in chapter three. In chapter four, we have studied the robustness and mode selectivity in PT symmetric lasers. We investigate two important aspects of PT symmetric photonic molecule lasers, namely the robustness of their single longitudinal mode operation against instabilities triggered by spectral hole burning effects, and the possibility of more versatile mode selectivity. Our results, supported by numerically integrating the nonlinear rate equations and performing linear stability analysis, reveals the following: (1) In principle a second threshold exists after which single mode operation becomes unstable, signaling multimode oscillatory dynamics, (2) For a wide range of design parameters, single mode operation of PT lasers having relatively large free spectral range (FSR) can be robust even at higher gain values, (3) PT symmetric photonic molecule lasers are more robust than their counterpart structures made of single microresonators; and (4) Extending the concept of single longitudinal mode operation based on PT symmetry in millimeter long edge emitting lasers having smaller FSR can be challenging due to instabilities induced by nonlinear modal interactions. Finally, we also present a possible strategy based on loss engineering to achieve more control over the mode selectivity by suppressing the mode that has the highest gain (i.e. lies under the peak of the gain spectrum curve) and switch the lasing action to another mode. In chapter five a new scheme for building two dimensional laser arrays that operate in the single supermode regime is proposed. This is done by introducing an optical coupling between the laser array and a lossy pseudo-isospectral chain of photonic resonators. The spectrum of this discrete reservoir is tailored to suppress all the supermodes of the main array except the fundamental one. This spectral engineering is facilitated by employing the Householder transformation in conjunction with discrete supersymmetry. The proposed scheme is general and can in principle be used in different platforms such as VCSEL arrays and photonic crystal laser arrays. Finally, in chapter six we have investigated the laser self-termination (LST) in trimer photonic molecules. It is shown that under the appropriate conditions, LST can exist in complex discrete structures made of three-cavity photonic molecule lasers. We have shown that the phenomenon of LST is a purely linear effect associated with avoided level crossings. Furthermore, our simulations show that the predicted behavior is persistent when gain saturation nonlinearity is taken into account. Conclusion remarks and future works are discussed in the last… Advisors/Committee Members: Ramy El-Ganainy.

Subjects/Keywords: Photonics; non-Hermitian Photonics; PT symmetry; Supersymmetry; Semiconductor lasers; Single mode lasers; Optics

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

APA (6th Edition):

Teimourpour, M. H. (2017). QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING. (Doctoral Dissertation). Michigan Technological University. Retrieved from http://digitalcommons.mtu.edu/etdr/557

Chicago Manual of Style (16th Edition):

Teimourpour, Mohammad Hosain. “QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING.” 2017. Doctoral Dissertation, Michigan Technological University. Accessed October 17, 2019. http://digitalcommons.mtu.edu/etdr/557.

MLA Handbook (7th Edition):

Teimourpour, Mohammad Hosain. “QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING.” 2017. Web. 17 Oct 2019.

Vancouver:

Teimourpour MH. QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING. [Internet] [Doctoral dissertation]. Michigan Technological University; 2017. [cited 2019 Oct 17]. Available from: http://digitalcommons.mtu.edu/etdr/557.

Council of Science Editors:

Teimourpour MH. QUANTUM INSPIRED SYMMETRIES IN LASER ENGINEERING. [Doctoral Dissertation]. Michigan Technological University; 2017. Available from: http://digitalcommons.mtu.edu/etdr/557


Michigan Technological University

3. Kalita, Armin. Synthetic Saturable Absorber.

Degree: MS, Department of Physics, 2019, Michigan Technological University

The interplay between the discrete diffraction and Kerr non-linearity can give rise to the formation of bulk and surface solitons. In Jx waveguide arrays where perfect state transfer is possible, these nonlinear effects can lead to a sharp transition between low and high transmission coeffcients as a function of the input light intensity. As proposed recently, this property can be used to build ultrafast, high performance saturable absorbers for laser applications. In this thesis, we present realistic designs of saturable absorbers based on Jx waveguide arrays in silica platforms. We investigate the performance of the proposed device using full-wave electromagnetic simulations and we discuss their fabrication technology using laser-writing in glass. Advisors/Committee Members: Ramy El-Ganainy.

Subjects/Keywords: waveguide; discrete diffraction; laser-writing; soliton; Atomic, Molecular and Optical Physics; Optics

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

APA (6th Edition):

Kalita, A. (2019). Synthetic Saturable Absorber. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/877

Chicago Manual of Style (16th Edition):

Kalita, Armin. “Synthetic Saturable Absorber.” 2019. Masters Thesis, Michigan Technological University. Accessed October 17, 2019. https://digitalcommons.mtu.edu/etdr/877.

MLA Handbook (7th Edition):

Kalita, Armin. “Synthetic Saturable Absorber.” 2019. Web. 17 Oct 2019.

Vancouver:

Kalita A. Synthetic Saturable Absorber. [Internet] [Masters thesis]. Michigan Technological University; 2019. [cited 2019 Oct 17]. Available from: https://digitalcommons.mtu.edu/etdr/877.

Council of Science Editors:

Kalita A. Synthetic Saturable Absorber. [Masters Thesis]. Michigan Technological University; 2019. Available from: https://digitalcommons.mtu.edu/etdr/877

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