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7 March 2014 Nonlinear effects in coherently coupled laser resonators
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A procedure is described to accurately measure the self phase-tuning in a coupled fiber laser. A fiber is designed and fabricated to eliminate the effects of self-tuning from wavelength shifting, thermal expansion, and thermally induced index change, allowing us to study the phase effects produced by Kramers-Kronig phase shifting as a function of various cavity parameters. For sufficient pump power, we observe that the Kramers-Kronig effect is capable of compensating for all path length errors introduced into the cavity, resulting in efficient lasing under all path length conditions. We have directly measured the Kramers-Kronig-induced phase shift and present experimental evidence that this additional phase compensates for the applied phase error and promotes efficient lasing.
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James R. Leger and Hung-Sheng Chiang "Nonlinear effects in coherently coupled laser resonators", Proc. SPIE 8960, Laser Resonators, Microresonators, and Beam Control XVI, 89601E (7 March 2014);

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