Laboratoire de photonique et mesures quantiques (STI/SB)

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Fully self-contained turn-key soliton microcomb source

Jijun He, John David Jost, Tobias Kippenberg, Grigorii Likhachev, Junqiu Liu, Arslan Sajid Raja, Rui Ning Wang

We demonstrate a turn-key microcomb source based on 100 GHz Si3N4 ring microresonator. The device is fully optically and electronically integrated in a compact box, which runs by pushing one button.

IEEE2021

Electrically tunable optical resonator on a chip for fast tunable integrated lasers

Tobias Kippenberg, Grigorii Likhachev, Anat Siddharth

The present invention relates to an electrically tunable photonic resonator device for a component having a fast and flat actuation response, comprising: - At least one optical waveguide with an optical interface for coupling in laser light, - At least one optical resonator including a waveguide being made of an optical resonator material, particularly Si3N4, wherein laser light coupled via the at least one optical waveguide is coupled into the at least one optical resonator, - At least one piezo actuator to apply mechanical stress at least partially onto the at least one optical resonator; wherein the at least one optical resonator, the at least one piezo actuator and the at least one optical waveguide are monolithically integrated on a common substrate of the photonic resonator device; - a mechanical mode suppression means configured to attenuate one or more mechanical modes of oscillation caused by an AC operation of the at least one piezo actuator.

2022

Experimental demonstration of dynamic spatiotemporal structured beams that simultaneously exhibit two orbital angular momenta by combining multiple frequency lines, each carrying multiple Laguerre-Gaussian modes

Maxim Karpov, Tobias Kippenberg, Hao Song, Xinzhou Su, Zhe Zhao

In general, there are different, relatively independent forms of orbital angular momenta at a given propagation distance, which might exhibit different dynamic spatial characteristics. One type involves a beam with a helical phase-front that rotates around its own beam center, such as a Laguerre-Gaussian (LG) beam with an azimuthal index not equal to zero. The other one is a Gaussian-like beam dot that revolves around a central axis. Here, we experimentally demonstrate the generation of a dynamic spatiotemporal (ST) structured beam that simultaneously exhibits both rotation and revolution at a given propagation distance. Nine Kerr frequency comb lines are coherently combined, each carrying a designed superposition of multiple LG modes containing one unique l value and multiple p values. Experimental results showthat the mode purity of the reconstructed revolving and rotating LG(30) beam is similar to 89% when both the beam waist and revolving radius (R) are 0.4 mm. Moreover, we explore the effects of the number of frequency comb lines and the R value on the mode purity of the generated ST beam. Consequently, we find that a higher mode purity can be achieved by involving more frequency comb lines or reducing the R. (C) 2022 Optica Publishing Group

Optica Publishing Group2022