Uncovering the physical origin of self-phasing in coupled fiber lasers

Hung-Sheng Chiang; James R. Leger

doi:10.1117/12.2085406

3 March 2015 Uncovering the physical origin of self-phasing in coupled fiber lasers

Hung-Sheng Chiang, James R. Leger

Proceedings Volume 9343, Laser Resonators, Microresonators, and Beam Control XVII; 93431A (2015) https://doi.org/10.1117/12.2085406
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

We studied coherent beam combining in a specific laser cavity architecture in which two Ytterbium-doped fiber amplifiers are passively coupled using a homemade binary phase Dammann grating. Our experimental results show that coherent beam combining is robust against phase perturbation in such a laser cavity architecture when the operating point is sufficiently above the lasing threshold. We observed redistribution of energy within the supermode of this laser cavity in response to an externally applied path length error. The energy redistribution is accompanied by an internal differential phase shift between the coherently coupled gain arms. Self-phasing mitigates or even completely neutralizes the externally applied optical path length error. We identify the physical origin of the observed self-phasing with the resonant (gain related) nonlinearity in the gain elements under our experimental conditions.

Citation Download Citation

Hung-Sheng Chiang and James R. Leger "Uncovering the physical origin of self-phasing in coupled fiber lasers", Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431A (3 March 2015); https://doi.org/10.1117/12.2085406

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