Study of broadband multimode light via non-phase-matched sum frequency generation
arXiv:1810.02760 · doi:10.1088/1367-2630/ab0a7c
Abstract
We propose non-phase-matched sum frequency generation (SFG) as a method for characterizing broadband multimode light. We demonstrate its advantages using high-gain parametric down conversion (PDC) as an example. By generating the sum frequency in the near-surface region of a nonlinear crystal, we increase the SFG efficiency and get rid of the modulation caused by chromatic dispersion, known as Maker fringes. The obtained results interpreted in terms of the Schmidt mode formalism reveal the sensitivity of the SFG spectrum to the number of frequency modes. Furthermore, we demonstrate efficient non-phase-matched three- and four-frequency summation of broadband multimode light, barely possible under phase matching.
arXiv comment13 pages, 7 figures,
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