Continuous-wave mode-locked optical parametric oscillator

Kavita Devi; S. Chaitanya Kumar; G. K. Samanta; A. Esteban-Martin; M. Ebrahim-Zadeh

doi:10.1117/12.922106

15 May 2012 Continuous-wave mode-locked optical parametric oscillator

Kavita Devi, S. Chaitanya Kumar, G. K. Samanta, A. Esteban-Martin, M. Ebrahim-Zadeh

Proceedings Volume 8434, Nonlinear Optics and Applications VI; 84340D (2012) https://doi.org/10.1117/12.922106
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

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.

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Kavita Devi, S. Chaitanya Kumar, G. K. Samanta, A. Esteban-Martin, and M. Ebrahim-Zadeh "Continuous-wave mode-locked optical parametric oscillator", Proc. SPIE 8434, Nonlinear Optics and Applications VI, 84340D (15 May 2012); https://doi.org/10.1117/12.922106

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KEYWORDS

Modulation

Mode locking

Continuous wave operation

Optical parametric oscillators

Picosecond phenomena

Crystals

Phase shift keying

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