6 October 2003 Active stabilization of quasi-CW passively modelocked Nd:based lasers using closed-loop feedback
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Proceedings Volume 5137, International Conference on Lasers, Applications, and Technologies 2002: Advanced Lasers and Systems; (2003) https://doi.org/10.1117/12.517923
Event: International Conference on Lasers, Applications, and Technologies 2002, 2002, Moscow, Russian Federation
Abstract
The technique of operating picosecond modelocked laser systems quasi-CW is presented. Higher modelocked output power results at the expense of reduced effective pulse repetition rate. Passively modelocked quasi-CW lasers at 1.0 and 1.3 μm with high 'on-time' powers (~65W) are described. Active stabilization of these systems is demonstrated via negative feedback using an intracavity loss modulator. Stabilization suppresses relaxation-oscillation driven spiking on reaching threshold and prevents Q-switching of the laser caused by the presence of a saturable absorber for modelocking. In this way, the usable parameter range of a saturable absorber for stable CW modelocking is extended such that stable Q-switch free modelocking of a quasi-CW laser with pulse repetition rates over 900MHz, is possible. Numerical modeling confirms the flexible nature of stabilization via negative feedback applied to unstable laser systems incorporating saturable absorbers.
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Gareth J. Valentine, Gareth J. Valentine, Erwin A. Bente, Erwin A. Bente, David Burns, David Burns, Allister I. Ferguson, Allister I. Ferguson, "Active stabilization of quasi-CW passively modelocked Nd:based lasers using closed-loop feedback", Proc. SPIE 5137, International Conference on Lasers, Applications, and Technologies 2002: Advanced Lasers and Systems, (6 October 2003); doi: 10.1117/12.517923; https://doi.org/10.1117/12.517923
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