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Acousto-optic pulse picking scheme with carrier-frequency-to-pulse-repetition-rate synchronization

: Vries, O. de; Saule, T.; Plötner, M.; Lücking, F.; Eidam, T.; Hoffmann, A.; Klenke, A.; Hädrich, S.; Limpert, J.; Holzberger, S.; Schreiber, T.; Eberhardt, R.; Pupeza, I.; Tünnermann, A.

Volltext ()

Optics Express 23 (2015), Nr.15, S.19586-19595
ISSN: 1094-4087
European Commission EC
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

We introduce and experimentally validate a pulse picking technique based on a travelling-wave-type acousto-optic modulator (AOM) having the AOM carrier frequency synchronized to the repetition rate of the original pulse train. As a consequence, the phase noise characteristic of the original pulse train is largely preserved, rendering this technique suitable for applications requiring carrier-envelope phase stabilization. In a proof-of-principle experiment, the 1030-nm spectral part of an 74-MHz, carrier-envelope phase stable Ti:sapphire oscillator is amplified and reduced in pulse repetition frequency by a factor of two, maintaining an unprecedentedly low carrier-envelope phase noise spectral density of below 68 mrad. Furthermore, a comparative analysis reveals that the pulse-picking-induced additional amplitude noise is minimized, when the AOM is operated under synchronicity. The proposed scheme is particularly suitable when the down-picked repetition rate is still in the multi-MHz-range, where Pockels cells cannot be applied due to piezoelectric ringing.