Linear laser tuning using a pressure-sensitive microbubble resonator
IEEE Photonics Technology Letters, 2016•ieeexplore.ieee.org
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 …
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 …
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 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 min for an input pressure of 0.5 MPa has a maximum standard deviation of 36 MHz.
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