Single-Frequency Violet and Blue Laser Emission from AlGaInN Photonic Integrated Circuit Chips

Abstract:

Chip-based, single-frequency and low phase-noise integrated photonic laser diodes emitting in the violet (412 nm) and blue (461 nm) regime are demonstrated. The GaN-based edge-emitting laser diodes were coupled to high-Q on-chip micro-resonators for optical feedback and mode selection resulting in laser self-injection locking with narrow emission linewidth. Multiple group III-nitride (III-N) based photonic integrated circuit chips with different waveguide designs including single-crystalline AlN, AlGaN, and GaN were developed and characterized. Single-frequency laser operation was demonstrated for all studied waveguide core materials. The best side-mode suppression ratio was determined to be ∼36 dB at 412 nm with a single-frequency laser emission linewidth of only about 3.8 MHz at 461 nm. The performance metrics of this novel type of laser suggest potential implementation in next generation, portable quantum systems.   View the publication

Citation

https://doi.org/10.1364/opticaopen.21984815.v1