Dither-free stabilization of a femtosecond doubly-resonant OPO using parasitic sum-frequency mixing

Research output: Contribution to journalArticle

1 Citation (Scopus)
10 Downloads (Pure)

Abstract

Stable operation of a doubly-resonant femtosecond optical parametric oscillator (OPO) requires sub-micron matching of the OPO and pump-laser cavity lengths, which is normally implemented using a dither-locking feedback scheme. Here we show that parasitic sum-frequency-mixing between the pump and resonant pulses of a degenerate femtosecond OPO provides an error signal suitable for actuating the cavity length with the precision needed to maintain oscillation on a single fringe and at maximum output power. Unlike commonly used dither-locking approaches, the method introduces no modulation noise and requires no additional optical components, except for one narrowband filter. The scheme is demonstrated on a Ti:sapphire-pumped sub-40-fs PPKTP OPO, from which data are presented showing a tenfold reduction in relative intensity noise compared with dither locking.
Original languageEnglish
Pages (from-to)768-771
Number of pages4
JournalOptics Letters
Volume45
Issue number3
Early online date12 Nov 2019
DOIs
Publication statusPublished - 1 Feb 2020

Fingerprint Dive into the research topics of 'Dither-free stabilization of a femtosecond doubly-resonant OPO using parasitic sum-frequency mixing'. Together they form a unique fingerprint.

Cite this