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Abstract
We used a novel system based on a lower critical solution temperature (LCST) mixture containing a high gain laser dye to study laser actions in random scattering media. The LCST material comprised of hydroxypropyl cellulose (HPC) in water can be reversibly transformed from a transparent state to a highly scattering colloid as the temperature is increased above 41 °C. The resulting temperature-dependent scattering length and photon diffusivity in the presence of an amplifying optically pumped Kiton Red 620 laser dye can tune the linewidth of output spectrum from 30 to 5 nm. Besides its suitability for random laser studies, this system may find its applications in remote temperature sensing and displays.
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