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Author Liew, Seng Fatt ♦ Redding, Brandon ♦ Cao, Hui ♦ Ge, Li ♦ Solomon, Glenn S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ BEAM POSITION ♦ BEAMS ♦ CONTROL ♦ DISTURBANCES ♦ FABRICATION ♦ LASERS ♦ REFRACTIVE INDEX ♦ ROUGHNESS ♦ SEMICONDUCTOR MATERIALS ♦ SYMMETRY
Abstract We demonstrate a simple yet effective approach of controlling lasing in a semiconductor microdisk by photo-thermal effect. A continuous wave green laser beam, focused onto the microdisk perimeter, can enhance or suppress lasing in different cavity modes, depending on the position of the focused beam. Its main effect is a local modification of the refractive index of the disk, which results in an increase in the power slope of some lasing modes and a decrease of others. The boundary roughness breaks the rotational symmetry of a circular disk, allowing the lasing process to be tuned by varying the green beam position. Using the same approach, we can also fine tune the relative intensity of a quasi-degenerate pair of lasing modes. Such post-fabrication control, enabled by an additional laser beam, is flexible and reversible, thus enhancing the functionality of semiconductor microdisk lasers.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-02-01
Publisher Place United States
Journal Applied Physics Letters
Volume Number 108
Issue Number 5


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