Published on: Thu Jan 05 2012
Carrie Segal, Marty Cohen, John Noé Laser Teaching Center, Stony Brook University✣ Project Motivation [caption id="attachment_1008" align="alignleft" width="150" caption="Source: J.U. Fürst"][/caption] While researching methods of second harmonic generation, we learned that achieving frequency doubling at a low power level was a novel use of whispering gallery resonators. This led to an exploration of whispering gallery resonators, and resulted in an interest in developing a precisely tunable laser source for the excitation of these narrow (in the MHz range) modes. We hope to excite narrow whispering-gallery resonances in macroscopic glass spheres by evanescent-wave coupling to a precisely-tunable single-frequency laser source. As a first step, we have developed a 130-190 MHz tunable source for a 632.8 nm HeNe laser, using a 65-95 MHz AOM in double pass configuration. Whispering Gallery Modes