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Dynamic regulating of lasing mode in a whispering-gallery microresonator by thermo-optic effect
- Source :
- Applied Physics Letters. 119:131103
- Publication Year :
- 2021
- Publisher :
- AIP Publishing, 2021.
-
Abstract
- Realizing dynamic regulation of specific optical components while being easy to integrate with photonic circuits will have a revolutionary impact on tunable laser sources, active filters, and all-optical switching/integration. Here, we demonstrate a temperature tunable Ga-doped ZnO microresonator with a conductivity of ∼1.75 S/cm controlled by the injection current and realize point-to-point heating. The shift in the resonant wavelength with a tuning range of 2 nm for TE66 mode is achieved by the effect of current-induced temperature rising on the refractive index of the microresonator crystal, namely, the thermo-optic effect. Meanwhile, the thermo-optic coefficient of 16.7 × 10−4/K around the bandgap energy of ZnO is also obtained. This operating mode of electronically controlled temperature establishes a solid foundation for the practicality and integration of tunable lasers.
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........66577af9b39ad39dba6b1337d1b056af