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Sökning: WFRF:(Picozzi Antonio)

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1.
  • Montes, Carlos, et al. (författare)
  • Ultra-coherent signal output from an incoherent cw-pumped singly resonant optical parametric oscillator
  • 2004
  • Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 237:4-6, s. 437-449
  • Tidskriftsartikel (refereegranskat)abstract
    • Incoherent broad-bandwidth cw-pumped singly resonant optical parametric oscillator (OPO), in the quasi-phase-matched non-degenerate configuration, may efficiently generate ultra-coherent signal output by the convection-induced phase-locking mechanism in which the incoherence of the pump is absorbed by the idler wave allowing the signal to become highly coherent. In actual nonlinear quadratic waveguide configurations one obtains signal spectral widths smaller than 5 x 10(-4) times the pump spectral width, and a reduction of the average signal intensity fluctuations by less than a factor 10(-4).
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2.
  • Strömqvist, Gustav, et al. (författare)
  • Temporal coherence in mirrorless optical parametric oscillators
  • 2012
  • Ingår i: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 29:6, s. 1194-1202
  • Tidskriftsartikel (refereegranskat)abstract
    • One of the unique features of mirrorless optical parametric oscillators based on counterpropagating three-wave interactions is the narrow spectral width of the wave generated in the backward direction. In this work, we investigate experimentally and numerically the influence that a strong phase modulation in the pump has on the spectral bandwidths of the parametric waves and on the efficiency of the nonlinear interaction. The effects of group-velocity mismatch and group-velocity dispersion are elucidated. In particular, it is shown that the substantial increase in temporal coherence of the backward-generated wave can be obtained even for pumping with a temporally incoherent pump. A configuration of a mirrorless optical parametric oscillator is proposed where this gain in spectral coherence is maximized without a penalty in conversion efficiency by employing group-velocity matching of the pump and the forward-generated parametric wave.
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