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Comandar LC, Lucamarini M, Fröhlich B, et al. Near perfect mode overlap between independently seeded, gain-switched lasers. Opt Express. 2016;24(16):17849-59doi: 10.1364/OE.24.017849.
Comandar, L. C., Lucamarini, M., Fröhlich, B., Dynes, J. F., Yuan, Z. L., & Shields, A. J. (2016). Near perfect mode overlap between independently seeded, gain-switched lasers. Optics express, 24(16), 17849-59. https://doi.org/10.1364/OE.24.017849
Comandar, L C, et al. "Near perfect mode overlap between independently seeded, gain-switched lasers." Optics express vol. 24,16 (2016): 17849-59. doi: https://doi.org/10.1364/OE.24.017849
Comandar LC, Lucamarini M, Fröhlich B, Dynes JF, Yuan ZL, Shields AJ. Near perfect mode overlap between independently seeded, gain-switched lasers. Opt Express. 2016 Aug 08;24(16):17849-59. doi: 10.1364/OE.24.017849. PMID: 27505752.
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Opt Express. 2016 Aug 08;24(16):17849-59. doi: 10.1364/OE.24.017849.

Near perfect mode overlap between independently seeded, gain-switched lasers.

Optics express

L C Comandar, M Lucamarini, B Fröhlich, J F Dynes, Z L Yuan, A J Shields

PMID: 27505752 DOI: 10.1364/OE.24.017849

Abstract

We drastically improve the mode overlap between independently seeded, gain-switched laser diodes operating at gigahertz repetition rates by implementing a pulsed light seeding technique. Injecting pulsed light reduces the emission time jitter and enables frequency chirp synchronization while maintaining random optical phases of the emitted laser pulses. We measure interference of these pulsed sources both in the macroscopic regime, where we demonstrate near perfect mode overlap, and in the single photon regime, where we achieve a Hong-Ou-Mandel dip visibility of 0.499 ± 0.004, thus saturating the theoretical limit of 0.5. The measurement results are reproduced by Monte-Carlo simulations with no free parameters. Our light source is an ideal solution for generation of high rate, indistinguishable coherent pulses for quantum information applications.

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