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Breitkopf, Sven; Wunderlich, Stefano; Eidam, Tino; Shestaev, Evgeny; Gottschall, Thomas; Carstens, Henning; Holzberger, Simon; Pupeza, Ioachim; Limpert, Jens and Tünnermann, Andreas (2016): Investigation of a 10 MHz, non-steady state cavity for pulse energy enhancement of ultrafast fiber lasers. Fiber Lasers XIII: Technology, Systems, and Applications, 13-18 February 2016, San Francisco, California, United States. Proceedings of SPIE. Vol. 9728, UNSP 97282W Bellingham, Washington: SPIE.

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Here, we present a passive 30-m long enhancement cavity that supports a steady-state enhancement of 198, which is the highest enhancement that has ever been reached in such a long cavity. Furthermore, we demonstrate the extraction of a short burst with a total energy of 53.6 mu J employing an acousto-optic modulator (AOM) as a switching device. The cavity was seeded with pulses of 1.49 mu J energy at 10 MHz repetition rate. The individual output coupled pulses showed an energy enhancement of up to 8.5 while the whole burst contained the entire energy of 36 input pulses. In the last section theoretical considerations for the single pulse extraction are presented and briefly discussed.

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