Passively mode-locked laser with an ultra-narrow spectral width

Kues, Michael, Reimer, Christian, Wetzel, Benjamin, Roztocki, Piotr, Little, Brent E, Chu, Sai T, Hansson, Tobias, Viktorov, Evgeny A, Moss, David J and Morandotti, Roberto (2017) Passively mode-locked laser with an ultra-narrow spectral width. Nature Photonics. ISSN 1749-4885

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Abstract

Most mode-locking techniques introduced in the past focused mainly on increasing the spectral bandwidth to achieve ultrashort, sub-picosecond-long coherent light pulses. By contrast, less importance seemed to be given to mode-locked lasers generating Fourier-transform-limited nanosecond pulses, which feature the narrow spectral bandwidths required for applications in spectroscopy, the efficient excitation of molecules, sensing and quantum optics. Here, we demonstrate a passively mode-locked laser system that relies on simultaneous nested cavity filtering and cavity-enhanced nonlinear interactions within an integrated microring resonator. This allows us to produce optical pulses in the nanosecond regime (4.3 ns in duration), with an overall spectral bandwidth of 104.9 MHz—more than two orders of magnitude smaller than previous realizations. The very narrow bandwidth of our laser makes it possible to fully characterize its spectral properties in the radiofrequency domain using widely available GHz-bandwidth optoelectronic components. In turn, this characterization reveals the strong coherence of the generated pulse train.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Related URLs:
Depositing User: Benjamin Wetzel
Date Deposited: 02 Feb 2017 09:51
Last Modified: 24 Jul 2017 14:56
URI: http://sro.sussex.ac.uk/id/eprint/66544

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