1. Hybrid integrated near UV lasers using the deep-UV Al2O3 platform
- Author
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Franken, C.A.A., Hendriks, W.A.P.M., Winkler, L.V., Dijkstra, M., do Nascimento Jr., A.R., van Rees, A., Mardani, M.R.S., Dekker, R., van Kerkhof, J., van der Slot, P.J.M., García Blanco, S.M., Boller, K.-J., MESA+ Institute, and Laser Physics & Nonlinear Optics
- Abstract
Hybrid integrated diode lasers have so far been realized using silicon, polymer, and silicon nitride (Si3N4) waveguide platforms for extending on-chip tunable light engines from the infrared throughout the visible range. Here we demonstrate the first hybrid integrated laser using the aluminum oxide (Al2O3) deep-UV capable waveguide platform. By permanently coupling low-loss Al2O3 frequency-tunable Vernier feedback circuits with GaN double-pass amplifiers in a hermetically sealed housing, we demonstrate the first extended cavity diode laser (ECDL) in the near UV. The laser shows a maximum fiber-coupled output power of 0.74 mW, corresponding to about 3.5 mW on chip, and tunes more than 4.4 nm in wavelength from 408.1 nm to 403.7 nm. Integrating stable, single-mode and tunable lasers into a deep-UV platform opens a new path for chip-integrated photonic applications.
- Published
- 2023