Experimental Demonstration of All-Optical Tunable Methods for UCA Microbottle Cavity

We propose and validate two different all-optical tuning modes in an ultraviolet-curable adhesive (UCA, NOA61) microbottle cavity. In the first pump-light-coupled tuning method, when the pump light power is increased to 90 mW, the resonant wavelength for the NOA61 microbottle cavity drifts by 3.053 nm. In addition, the microbottle cavity exhibits a nanometer free-spectrum range, enabling all-optical tuning over the full wavelength range. In the second indirect pump-light-assisted tuning method, the tuning efficiency of the pump-light-assisted indirect tuning method is 14.17 pm/mW, which is smaller than the value of the pump-light-coupled tuning method 33.92 pm/mW. The NOA61 microbottle cavity, fabricated by a simple, low-cost preparation method, shows good tuning performance and can be applied to all-optical switches, tunable filters, and lasers.