Quasi-phase-matched second harmonic generation of UV light using AlN waveguides
Abstract
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 344 nm and 472 nm 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 11, 2019
- Source ID
- 10.1063/1.5087058
Entities
People
- Axel Hoffmann
- Dorian Alden
- Marko Zgonik
- Qiang Guo
- Ramón Collazo
- Ronny Kirste
- Seiji Mita
- Tinkara Troha
- Zlatko Sitar
Organizations
- Army Research Office
- Ensenada Center for Scientific Research and Higher Education
- Ministry of Education, Science, Research and Youth of the Slovak Republic
- National Science Foundation
- North Carolina State University
- Technische Universität Berlin
- University of Ljubljana