Quasi-phase-matched second harmonic generation of UV light using AlN waveguides

Alden, Dorian (author), Troha, Tinkara (author), Kirste, Ronny (author), Mita, Seiji (author), Guo, Qiang (author), Hoffmann, Axel (author), Zgonik, Marko (author), Collazo, Ramón (author), Sitar, Zlatko (author)

As an alternative to electrically injected diodes, UV light emission can be obtained via second harmonic generation (SHG). In weakly birefringent materials such as aluminum nitride (AlN), the phase matching of the driving and second harmonic waves can be achieved by the quasi-phase-matching (QPM) technique, where the polarity of the material is periodically changed commensurate with the coherence wavelength. QPM also allows the use of the highest nonlinear susceptibility, and therefore, higher conversion efficiencies are possible. In this work, the QPM SHG of UV light in AlN lateral polar structure-based waveguides is demonstrated. The peak intensity of the frequency doubled laser light was measured at 344nm and 472nm wavelengths, in agreement with dispersion-based theoretical predictions. These results confirm the potential of III-nitride-based lateral polar structures for quasi-phase-matched nonlinear optics and for frequency doubling media for UV light generation.

• Language: English
• Keywords: nonlinear optics, optical waveguides, second harmonic generation, semiconductors
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2019
• Number of pages: Str. 103504-1-103504-4
• Numbering: Vol. 114, iss. 10
• PID: 20.500.12556/RUL-106753
• UDC: 535.18
• ISSN on article: 0003-6951
• DOI: 10.1063/1.5087058
• COBISS.SI-ID: 3297380
• Publication date in RUL: 15.03.2019

Record is a part of a journal

• Title: Applied physics letters
• Shortened title: Appl. phys. lett.
• Publisher: American Institute of Physics
• ISSN: 0003-6951
• COBISS.SI-ID: 24984832

Secondary language

• Language: Slovenian
• Keywords: nelinearna optika, optični valovodi, frekvenčno podvajanje, polprevodniki