Reconfigurable photonic technology combining multiple functionalities in a single gain-chip is a crucial light-based platform for enabling hybrid applications. Here, we report on achieving a widely tunable and reconfigurable blue laser source using a single-port gain medium based on an InGaN/GaN superluminescent diode (SLD). As compared to tunable laser-diode emitters based solely on stimulated emission from a laser diode used as the gain medium, our amplified spontaneous emission system is capable of fast switching between the stimulated and amplified spontaneous emission regimes for on-demand use of time-incoherent, or time-coherent light with single- or dual-wavelengths. The single- and dual-wavelength laser tunability is designed using various external cavity (EC) configurations for a continuous selection and smooth transition of the emission wavelength from 436 nm–443 nm. Moreover, the InGaN SLD can amplify the optical power within the EC configuration by 6.5 dB. Thus, the prototype system opens up a viable route for designing reconfigurable light sources based on a single gain chip, and promises disruptive innovation for medical instrumentation, optical sensing technology, and optical communication.
Bibliographical noteKAUST Repository Item: Exported on 2020-12-23
Acknowledged KAUST grant number(s): BAS/1/1614-01-01, GEN/1/6607-01-01, OSR-CRG2017-3417
Acknowledgements: This work is funded by King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR)(OSR-CRG2017-3417). The authors acknowledge KAUST baseline funding BAS/1/1614-01-01 and KAUST CEMSE funding GEN/1/6607-01-01. T.K.N. and B.S.O. acknowledge support from King Abdulaziz City for Science and Technology for the establishment of KACST Technology Innovation Center on Solid-State Lighting at KAUST, Grant no. KACST TIC R2-FP008. The authors further acknowledge access to the KAUST Imaging and Characterization Core Lab for the use of scanning electron microscope.