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Proceedings Paper

Continuous-wave mode-locked optical parametric oscillator
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Paper Abstract

We report a novel technique for the generation of mode-locked pulses from a continuous-wave (cw) optical parametric oscillator (OPO). The technique is based on the deployment of an electro-optic phase modulator (EOM) in combination with an antiresonant ring (ARR) interferometer internal to a cw OPO. The scheme is implemented in a doubly-resonant cw OPO based on MgO:sPPLT, configured in a standing-wave cavity and pumped at 532 nm by a cw laser. With careful adjustment of the cavity length, modulation frequency and modulation depth, under different conditions, we achieved stable train of 730 ps and 450 ps pulses at a repetition rate of 160 MHz and 80 MHz, respectively. At degeneracy, spectral broadening of ~38 nm and ~20 nm has been observed corresponding to pulses of 160 MHz and 80 MHz repetition rate, respectively. We have confirmed true mode-locked operation by verifying ~4 times enhancement in second-harmonic-generation power under mode-locked operation at both 160 MHz and 80 MHz, compared to that in cw operation, for a fixed average fundamental power.

Paper Details

Date Published: 15 May 2012
PDF: 7 pages
Proc. SPIE 8434, Nonlinear Optics and Applications VI, 84340D (15 May 2012); doi: 10.1117/12.922106
Show Author Affiliations
Kavita Devi, ICFO - Institut de Ciències Fotòniques (Spain)
S. Chaitanya Kumar, ICFO - Institut de Ciències Fotòniques (Spain)
G. K. Samanta, ICFO - Institut de Ciències Fotòniques (Spain)
Physical Research Lab. (India)
A. Esteban-Martin, ICFO - Institut de Ciències Fotòniques (Spain)
M. Ebrahim-Zadeh, ICFO - Institut de Ciències Fotòniques (Spain)
Institucio Catalana de Recerca i Estudis Avancats (Spain)

Published in SPIE Proceedings Vol. 8434:
Nonlinear Optics and Applications VI
Benjamin J. Eggleton; Alexander L. Gaeta; Neil G. Broderick, Editor(s)

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