title: Laser emission from the whispering gallery modes of a graded index fiber.
abstract: Whispering gallery mode (WGM) laser emission has been observed from rhodamine B doped polymer optical graded index (GI) fiber by transverse pumping with a frequency doubled Q-switched Nd:YAG laser. The propagation and confinement of these modes were also observed. A variation in the free spectral range from 0.29 to 1.24 nm is obtained along the length due to the confinement of WGMs in the GI fiber.
authors.affiliation: International School of Photonics, Cochin University of Science and Technology, Cochin-22, India. linslal@gmail.com
authors.forename: C L
authors.initials: CL
authors.lastname: Linslal
authors.forename: S
authors.initials: S
authors.lastname: Mathew
authors.forename: P
authors.initials: P
authors.lastname: Radhakrishnan
authors.forename: V P N
authors.initials: VP
authors.lastname: Nampoori
authors.forename: C P
authors.initials: CP
authors.lastname: Girijavallabhan
authors.forename: M
authors.initials: M
authors.lastname: Kailasnath