Temperature tunable whispering gallery modes laser based on a capillary tube

摘要

In this work, a temperature tunable capillary-based polymer whispering gallery modes laser was proposed. The WGM laser device was fabricated by filling the liquid polymer into the capillary tubes. Due to the thermal-optic effect of the polymer, the emission wavelength of the laser device can be continuously tuned from 601.4 nm to 581.9 nm with the varying temperature. Moreover, the suppression of modes was observed owing to the two-ring coupling effect in the capillary cavity. The easy-fabricated and very low-cost method of the temperature tunable WGM laser was verified which exhibits the potentiality for applications of photothermic and sensing devices.