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

By M. Kues, C. Reimer, B. Wetzel, P. Roztocki, Brent E. Little, Sai T. Chu, Tobias Hansson, E. Viktorov, D. Moss, Roberto Morandotti. Nature Photonics, 2017

250 citations recorded by the source corpus.

A passively mode-locked laser system featuring cavity filtering and cavity-enhanced nonlinear interactions within an integrated microring resonator produces nanosecond optical pulses with a spectral width of 104.9 MHz. Most mode-locking techniques introduced in the past1,2 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 spectroscopy3, the efficient excitation of molecules4, sensing and quantum optics5. 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.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/a9f65e3754644db798887e575e8f1639828a34ce

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Orthogonally Polarized RF Optical Single Sideband Generation and Dual-Channel Equalization Based on an Integrated Microring Resonator (2018, background): “2 million [42]–[46], and a 20 dB bandwidth of ∼1 GHz (Fig.”
Broadband RF Channelizer Based on an Integrated Optical Frequency Kerr Comb Source (2018, background): “of the need for many discrete components, such as external RF sources and mode-locked lasers. Integrated micro-comb sources [27, 28, 29, 30, 31], particularly those based on CMOS-compatible platforms [32, 33, 34, 35, 36, 37, 38, 39, 40], offer many advantages for broadband RF channelizers compared w”
RF Photonics: An Optical Microcombs’ Perspective (2018, background): “locked laser structure with fibre nonlinear amplifying loop mirrors (NALMs), optical pulses in the nanosecond regime have been achieved [30].”