Multimode laser emission from dye doped polymer optical fiber | Zendy

M Sheeba | Zendy; K J Thomas | Zendy; Mandamparambil Rajesh | Zendy; V. P. N. Nampoori | Zendy; Chakkalakkal P. G. Vallabhan | Zendy; Padmanabhan Radhakrishnan | Zendy

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Multimode laser emission from dye doped polymer optical fiber

Author(s) -

M Sheeba,

K J Thomas,

Mandamparambil Rajesh,

V. P. N. Nampoori,

Chakkalakkal P. G. Vallabhan,

Padmanabhan Radhakrishnan

Publication year - 2007

Publication title -

applied optics

Language(s) - English

Resource type - Journals

ISSN - 0003-6935

DOI - 10.1364/ao.46.008089

Subject(s) - materials science , rhodamine 6g , multi mode optical fiber , optics , laser , fiber laser , dye laser , optical fiber , optoelectronics , fiber , amplified spontaneous emission , fluorescence , physics , wavelength , composite material

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.

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