Single and multiple wavelength laser systems are presented that employ self-injection locked InGaN/GaN green laser diodes in an external cavity configuration with a partially reflective mirror. A stable and simultaneous locking of up to four longitudinal Fabry–Perot modes of the system cavity is demonstrated with appreciable signal-to-noise-ratio of ∼13 dB and average mode linewidth of ∼150 pm. The multi-wavelength spectrum exhibited a flat-top emission with nearly equal power distribution among the modes and an analogous mode spacing of ∼0.5 nm. This first demonstration of multi-wavelength generation source is highly attractive in a multitude of cross-disciplinary field applications besides asserting the prospects of narrow wavelength spaced multiplexed visible light communication. Moreover, an extended two-stage self-injection locked near single wavelength visible laser system is also presented. An ultra-narrow linewidth of ∼34 pm is realized at 525.05 nm locked wavelength from this innovative system, with ∼20 dB side-mode-suppression-ratio; thus signifying a paradigm shift toward semiconductor lasers for near single lasing wavelength generation, which is presently dominated by other kinds of laser technologies.
|Original language||English (US)|
|Number of pages||7|
|Journal||IEEE Journal of Selected Topics in Quantum Electronics|
|State||Published - 2019|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): BAS/1/1614-01-01, KCR/1/2081-01-01, GEN/1/6607-01-01, REP/1/2878-01-01
Acknowledgements: This work was supported in part by the King Abdulaziz City for Science and Technology (KACST) under Grants EE2381 and KACST TIC R2-FP-008, in part by King Abdullah University of Science and Technology (KAUST) baseline funding under Grants BAS/1/1614-01-01, KCR/1/2081-01- 01, and GEN/1/6607-01-01, and in part by KAUST-KFUPM Special Initiative (KKI) Program (REP/1/2878-01-01).