Green-to-red tunable SHG of a quantum-dot laser in a PPKTP waveguide

K.A. Fedorova, G.S. Sokolovskii, P.R. Battle, D.A. Livshits, E.U. Rafailov

Research output: Contribution to journalArticlepeer-review


Quasi-phase-matching is an important and widelyused technique in nonlinear optics enabling efficient frequency up-conversion. However, since its introduction almost half a century ago, this technique is well developed for near infrared (IR) but is intrinsically limited in spectral tunability in the visible range by the strict conditions set by the spatial modulation which compensates the momentum mismatch imposed by the dispersion. Here, we provide a fundamental generalization of quasi-phase-matching based on the utilization of a significant difference in the effective refractive indices of the high- and low-order modes in multimode waveguides. This concept enables to match the period of poling in a very broad wavelength range and opens up a new avenue for an order-ofmagnitude increase in wavelength range for frequency conversion from a single crystal. Using this approach, we demonstrate an all-room-temperature continuous-wave (CW) second harmonic generation (SHG) with over 60 nm tunability from green to red in a periodically-poled potassium titanyl phosphate (PPKTP) waveguide pumped by a single broadly-tunable quantumdot laser diode.
Original languageEnglish
Pages (from-to)790-795
Number of pages6
JournalLaser Physics Letters
Issue number11
Publication statusPublished - 12 Sept 2012


  • second harmonic generation
  • quasi-phase-matching
  • nonlinear optical waveguides
  • quantum dot
  • diode laser
  • tunable laser


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