Linear Laser Tuning Using a Pressure-Sensitive Microbubble Resonator
arXiv:1511.05264 · doi:10.1109/LPT.2016.2532341
Abstract
The tunability of an optical cavity is an essential requirement for many areas of research. Here, we use the Pound-Drever-Hall technique to lock a laser to a whispering gallery mode (WGM) of a microbubble resonator, to show that linear tuning of the WGM, and the corresponding locked laser, display almost zero hysteresis. By applying aerostatic pressure to the interior surface of the microbubble resonator, optical mode shift rates of around GHz/MPa are achieved. The microbubble can measure pressure with a detection limit of MPa, which is an improvement made on pressure sensing using this device. The long-term frequency stability of this tuning method for different input pressures is measured. The frequency noise of the WGM measured over minutes for an input pressure of MPa, has a maximum standard deviation of MHz.
arXiv comment5 pages, 4 figures
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