Abstract

We report lasing characteristics of 40–60-μm-diameter Rhodamine 590/water solution droplets pumped by a 20-nsec-duration Q-switched laser. The Rhodamine/water solution provides a useful model system for studying the properties of oscillators based on whispering-gallery-wave spherical cavities. The low threshold for lasing, 10⁴ W/cm² for 10⁻⁴ M solutions, is consistent with particle size and a cavity Q factor of 10⁴. Portions of the droplet lase purely in transverse electric (TE) modes, while other portions contain both TE and lower-Q transverse magnetic modes. In the far field, the lasing droplet approximates a coherent point source emitting in all directions.

© 1986 Optical Society of America

Core-resonance capillary-fiber whispering-gallery-mode laser

J. C. Knight, H. S. T. Driver, R. J. Hutcheon, and G. N. Robertson
Opt. Lett. 17(18) 1280-1282 (1992)

Polarization characteristics of Whispering-Gallery-Mode fiber lasers based on evanescent-wave-coupled gain

Yuan-Xian Zhang, Xiao-Yun Pu, Li Feng, De-Yu Han, and Yi-Tao Ren
Opt. Express 21(10) 12617-12628 (2013)

Whispering-gallery-mode laser at 1.56 μm excited by a fiber taper

F. Lissillour, D. Messager, G. Stéphan, and P. Féron
Opt. Lett. 26(14) 1051-1053 (2001)

Laser emission from the whispering gallery modes of a graded index fiber

C. L. Linslal, S. Mathew, P. Radhakrishnan, V. P. N. Nampoori, C. P. Girijavallabhan, and M. Kailasnath
Opt. Lett. 38(17) 3261-3263 (2013)

Interference modulation of Q values in a cladded-fiber whispering-gallery-mode laser

J. C. Knight, H. S. T. Driver, and G. N. Robertson
Opt. Lett. 18(16) 1296-1298 (1993)