We propose a new mechanism for fully optical tuning and self-stabilization of microresonators based on optical fibers. We suggest using a fiber with core doped with rare earth active ions. Launching light into the core would result in heating and tuning the microcavity. We also show that utilizing a single laser for both pumping the micro-resonator and heating up the fibre creates a feedback for self-stabilization of the microcavity.
We showed that the microresonators of whispering gallery modes on the surface of standard optical fibers can be shaped by introducing negative radius variations of effective radius instead of positive. To do this, the sample of optical fiber is irradiated with CO2 laser and heated to temperatures that are well below the transformation temperature. The method reduces the influence of the heated spot to the surrounding silica and makes the modification method simpler. Combining both positive and negative modification also expands the range of axial shapes of microresonators that can be introduced with CO2 laser heating.
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