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arXiv · 1912.09455

Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser

Albert van Rees·Youwen Fan·Dimitri Geskus·Edwin J. Klein·Ruud M. Oldenbeuving·Peter J. M. van der Slot·Klaus-J. Boller
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Abstract

Extending the cavity length of diode lasers with feedback from Bragg structures and ring resonators is highly effective for obtaining ultra-narrow laser linewidths. However, cavity length extension also decreases the free-spectral range of the cavity. This reduces the wavelength range of continuous laser tuning that can be achieved with a given phase shift of an intracavity phase tuning element. We present a method that increases the range of continuous tuning to that of a short equivalent laser cavity, while maintaining the ultra-narrow linewidth of a long cavity. Using a single-frequency hybrid integrated InP-Si3N4 diode laser with 120 nm coverage around 1540 nm, with a maximum output of 24 mW and lowest intrinsic linewidth of 2.2 kHz, we demonstrate a six-fold increased continuous and mode-hop-free tuning range of 0.22 nm (28 GHz) as compared to the free-spectral range of the laser cavity.

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Albert van Rees, Youwen Fan, Dimitri Geskus, Edwin J. Klein, Ruud M. Oldenbeuving, Peter J. M. van der Slot, Klaus-J. Boller. 2019-12-19. Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser. https://doi.org/10.1364/oe.386356

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