Abstract
An experimental study was made on lasing features in both scattering gain media and amplified spontaneous emission systems from a rhodamine-6G xanthene dye in ethanol solution. The emission intensity, spectral line-half-width, and lasing threshold are investigated in terms of dye concentration, cell thickness, and pump energy. The analysis shows that both systems behave quite different. It was found that the scattering gain media present best lasing properties which are enhanced to smaller cell thickness where the backscattering effect plays a significant role. In addition, its laserlike characteristics were found slightly dependent on dye concentration within the range in which the dimer species influence is absent. In return, the amplified spontaneous emission systems were observed strongly dependent on the product of cell thickness and dye concentration, namely, optical density. These systems present lasing properties only around an optimized value of optical density. Within this range, their emission intensity, spectral line-half-width, and threshold could overcome those obtained from scattering gain media.
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