1. Long-term mutual phase locking of picosecond pulse pairs generated by a semiconductor nanowire laser
- Author
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Thomas Stettner, Kathy Lüdge, Gregor Koblmüller, Jonathan J. Finley, Michael Kaniber, A. Regler, S. Sterzl, Benjamin Lingnau, and Benedikt Mayer
- Subjects
Materials science ,Active laser medium ,Science ,FOS: Physical sciences ,Physics::Optics ,General Physics and Astronomy ,02 engineering and technology ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,law.invention ,Optics ,law ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,Ultrafast laser spectroscopy ,Laser power scaling ,010306 general physics ,Distributed feedback laser ,Multidisciplinary ,Condensed Matter - Mesoscale and Nanoscale Physics ,business.industry ,General Chemistry ,021001 nanoscience & nanotechnology ,Laser ,ddc ,Picosecond ,Photonics ,0210 nano-technology ,business ,Ultrashort pulse ,Optics (physics.optics) ,Physics - Optics - Abstract
The ability to generate phase-stabilized trains of ultrafast laser pulses by mode-locking underpins photonics research in fields, such as precision metrology and spectroscopy. However, the complexity of conventional mode-locked laser systems has hindered their realization at the nanoscale. Here we demonstrate that GaAs-AlGaAs nanowire lasers are capable of emitting pairs of phase-locked picosecond laser pulses with a repetition frequency up to 200 GHz when subject to incoherent pulsed optical excitation. By probing the two-pulse interference spectra, we show that pulse pairs remain mutually coherent over timescales extending to 30 ps, much longer than the emitted laser pulse duration (≤3 ps). Simulations performed by solving the optical Bloch equations produce good quantitative agreement with experiments, revealing how the phase information is stored in the gain medium close to transparency. Our results open the way to phase locking of nanowires integrated onto photonic circuits, optical injection locking and applications, such as on-chip Ramsey comb spectroscopy., Although nanolasers have been an active field of research for over a decade, mode-locking on the nanoscale has not been achieved yet. Here, Mayer et al. show that semiconductor nanowire lasers can emit pairs of phase-locked picosecond pulses when the nanowires are incoherently pumped.
- Published
- 2017