Single radial-mode lasing in a submicron-thickness spherical shell microlaser

Abstract

The authors have investigated whispering-gallery mode (WGM) lasing characteristics in a submicron-thickness spherical shell microlaser. The dielectric shell region was doped with dye molecules at a low concentration so as to provide a gain for lasing as well as to confine WGM’s tightly. Lasing in the lowest-mode-order WGM with a quality factor as high as 107 was observed.

Broadening free spectral range of an evanescent-wave pumped Whispering-Gallery-Mode fibre laser by Vernier effect

“…Evanescent-wave gain coupled circular microcavity lasers, such as cylindrical [1][2][3][4][5][6], spherical [7,8], capillary [9,10]and fibre knot [11] lasers, have generated much interest in recent years, which is mainly due to the fact that the gain media are distributed around their resonators and their potential applications in integrated optics, optoelectronics and optofluidics [12] etc. Because the evanescent field of a Whispering-Gallery-Mode (WGM) in a circular cavity extends into the gain medium, the lasing gain can be coupled into the WGM which provides optical feedback required by lasing oscillations.…”

Evanescent-Wave Pumped and Gain Coupled Whispering-Gallery-Mode Fibre Laser

“…Evanescent-wave gain coupled circular microcavity lasers, such as cylindrical [1][2][3][4][5][6], spherical [7,8], capillary [9,10] and fiber knot [11] lasers, have generated much interest in recent years, which are due mainly to the fact that the gain media are distributed around their resonators and their potential applications in integrated optics, optoelectronics and optofluidics [12,13] etc. As the evanescent field of a WGM in a circular cavity extends into the gain medium, the gain can be coupled into the WGM that provides optical feedback required by lasing oscillations.…”

Optical Properties of Micro-Spheres in Micro-Tube

“…They have found their wide applications as optical filters [5], laser sources [6,7], and biological sensors [8,9]. When light propagates circumferentially around the inside surface of a dielectric sphere, WGMs occur and confine photons in this small volume with a long time by total internal reflection.…”