Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser
| Autor: | van Rees, Albert, Fan, Youwen, Geskus, Dimitri, Klein, Edwin J., Oldenbeuving, Ruud M., van der Slot, Peter J. M., Boller, Klaus-J. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Optics Express, Vol. 28, Issue 4, pp. 5669-5683 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OE.386356 |
| Popis: | 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. Comment: 12 pages, 7 figures |
| Databáze: | arXiv |
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