Linear Laser Tuning Using a Pressure-Sensitive Microbubble Resonator

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 $58$ GHz/MPa are achieved. The microbubble can measure pressure with a detection limit of $2\times 10^{-4}$ 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 $10$ minutes for an input pressure of $0.5$ MPa, has a maximum standard deviation of $36$ MHz.

5 pages, 4 figures

References in corpus (5)

• Analogue to multiple electromagnetically induced transparency in all-optical drop-filter systems
• Quasi-droplet Microbubbles for High Resolution Sensing Applications
• A high-Q, ultrathin-walled microbubble resonator for aerostatic pressure sensing
• Coupled-mode induced transparency in aerostatically-tuned microbubble whispering gallery resonators
• Raman lasing in a hollow, bottle-like microresonator

Cited by in corpus (4)

• Whispering gallery microsensors: a review
• Tunable erbium-doped microbubble laser fabricated by sol-gel coating
• Cavity ring-up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator
• Structural characterization of thin-walled microbubble cavities