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Please use this identifier to cite or link to this item: http://purl.org/purl/2494

Title: Multimode laser emission from dye doped polymer optical fiber
Authors: Sheeba, Mavila
Thomas, Kannampuzha J
Rajesh, Mandamparambil
Nampoori, Vadakkedathu P N
Vallabhan, Chakkalakkal P G
Radhakrishnan, Padmanabhan
Technology
Keywords: laser emission
Issue Date: 2007
Publisher: Optical Society of America
Abstract: Multimode laser emission is observed in a polymer optical fiber doped with a mixture of Rhodamine 6G (Rh 6G) and Rhodamine B (Rh B) dyes. Tuning of laser emission is achieved by using the mixture of dyes due to the energy transfer occurring from donor molecule (Rh 6G) to acceptor molecule (Rh B). The dye doped poly(methyl methacrylate)-based polymer optical fiber is pumped axially at one end of the fiber using a 532 nm pulsed laser beam from a Nd:YAG laser and the fluorescence emission is collected from the other end. At low pump energy levels, fluorescence emission is observed. When the energy is increased beyond a threshold value, laser emission occurs with a multimode structure. The optical feedback for the gain medium is provided by the cylindrical surface of the optical fiber, which acts as a cavity. This fact is confirmed by the mode spacing dependence on the diameter of the fiber.
URI: http://dyuthi.cusat.ac.in/purl/2494
Appears in Collections:Dr.C P Girijavallabhan

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