Green-to-red tunable SHG of a quantum-dot laser in a PPKTP waveguide
Autor: | D.A. Livshits, P. Battle, G. S. Sokolovskii, Edik U. Rafailov, Ksenia A. Fedorova |
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Rok vydání: | 2012 |
Předmět: |
Quasi-phase-matching
Materials science Physics and Astronomy (miscellaneous) Potassium titanyl phosphate Physics::Optics 02 engineering and technology 01 natural sciences law.invention 010309 optics chemistry.chemical_compound 020210 optoelectronics & photonics Optics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering High harmonic generation Instrumentation Laser diode business.industry Second-harmonic generation Nonlinear optics chemistry Quantum dot laser Optoelectronics business Tunable laser |
Zdroj: | Laser Physics Letters. 9:790-795 |
ISSN: | 1612-202X 1612-2011 |
DOI: | 10.7452/lapl.201210085 |
Popis: | 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. |
Databáze: | OpenAIRE |
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