Self-starting of feedback control in lasers with a tendency to Q-switch

Joly, Nicolas; Bielawski, Serge

doi:10.1016/S0030-4018(03)01347-6

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Self-starting of feedback control in lasers with a tendency to Q-switch

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https://www.sciencedirect.com/science/article/pii/S0030401803013476
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Joly, N., & Bielawski, S. (2003). Self-starting of feedback control in lasers with a tendency to Q-switch. Optics Communications, 220, 171-177. doi:10.1016/S0030-4018(03)01347-6.

Cite as: https://hdl.handle.net/21.11116/0000-000F-C3B0-D

Abstract

We show that control of Q-switch instabilities using derivative feedback [Phys. Rev. A 47 (1993) 3276] can fail in a range of conditions. This problem appears in particular when the allowed perturbations on the pump power are limited in size. From a numerical bifurcation analysis, it appears that this problem arises from the coexistence of a spurious stable periodic solution together with the desired stabilized state. From this bifurcation analysis, we deduce a protocol that solves the problem, and permits to bring the system to steady-state behavior. It consists in applying the feedback before slowly increasing the pump power. This technique is expected to find applications in the suppression of Q-switch in mode-locked lasers.