Abstract
Random laser action is observed in the PM597 dye-doped chiral nematic liquid crystal (DDCLC) cells. A focal conic texture of chiral nematic liquid crystal (CLC) with many micro-domains is achieved in the cell without rubbing treatment. An Nd:YAG pulsed solid-state laser with a wavelength of 532 nm is employed as a pump source. Discrete and sharp random lasers with a line-width of 0.3 nm and wavelength range of 570–590 nm are obtained. The pump threshold energy of a random laser significantly depends on the cell thickness. The DDCLC cell with a thickness of 80 μm shows the lowest threshold value Eth of 7.6μJ, whereas the 10 μm DDCLC cell presents the highest Eth of 19.6μJ. The lower Eth is attributed to a denser micro-domain distribution that provides a stronger photon scattering at a certain pump depth. The random laser emission is shut down when the temperature reaches 61 °C.
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