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Upon return, the feedback light will be delayed with respect to the light in the cavity, and will have different phase, thus either amplifying or suppressing the laser output. While the recombination of the feedback light and light already in the cavity is usually linear, the delay, high gain,
65:, this is accomplished by parallel mirrors which cause light to be reflected within the lasing cavity, allowing for a single photon to be amplified several times by the lasing medium, while in the case of the
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light returns to the laser cavity. The effect is typical for any laser, although the cause of the feedback light varies: reflection from optical components, fiber edges,
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Lenstra, Daan; Vemuri, Gautam; Yousefi, Mirvais (2005-03-24). "Generalized
Optical Feedback: Theory".
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chirping, and relaxation oscillation create complex dynamic effects at the output.
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Ohtsubo, Junji (2017). "Theory of
Optical Feedback in Semiconductor Lasers".
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Optical feedback may result in significant changes in output power for
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