Dye lasers have attractive properties due to their broad spectral range tuning and high quantum efficiency. They are simpler to produce and cheaper in comparison with other laser sources. Two types of dye-doped active laser medium are mainly used, namely liquid and solid-state. The second type has some operational advantages relative to the first.
At present, research on solid-state dye lasers is a very active field. Organic dyes are doped in organic, inorganic glasses or in composite organic–inorganic materials. The processability, photo-stability and thermostability of the solid-state dye laser materials are sought to be improved continuously. Solid-state dye lasers have been developed as an attractive alternative to conventional liquid dye lasers, due to its low cost fabrication techniques, compactness, lack of toxicity or flammability, suppression of flow fluctuations, and the suppression of evaporation of solvent.
Several solid-host materials such as poly(methyl meth-acrylate) (PMMA), polystyrene, polyethyl-acrylate and polybutadiene etc., have been embedded with dyes to obtain laser emission.
However, low laser-damage resistance, low photobleaching threshold of dyes and relatively low laser efficiency has suppressed the usage of this class of lasers.
Therefore, the higher laser-damage resistance dye-doped host materials have been developed such as: modified polymers (modified-PMMA), co-polymers5 (poly(2-hydroxyethyl methacrylate) (PHEMA)), sol-gel (tetra-methoxysilane (TMOS), tetraethoxysilane (TEOS)).
Most of the research in dye-doped polymers was done with Rhodamine, which emits in the yellow to red regions of the spectrum. Very little research has been carried out on blue and UV emitting solid-state dye lasers. However, in the future, the blue and UV lasers might be required in some important fields, such as medical, tele-communications, optical data storage,
In this work, Fluorescence Spectra and lasing output from two prepared solid state dye laser samples of rhodamine B dissolved in Ethylene glycol (conc. 5´10-5 M) and mixed with 2-hydroxyethyl-methacrylate and methyl-methacrylate copolymer (volume mixture 1:1) polymerized by conventional thermal method (CTM) and gamma irradiation method (GIM) are measured and compared.