Abstract
We demonstrate the abundant dynamics of dye-doped liquid crystal (DD-LC) lasers through the variation of geometric shape and rubbing polyimide (PI) of glass cells. Not only the operation states, that is, Fabry–Perot lasers (FPLs) or random lasers (RLs), were manipulated by using a parallel or wedge cell, but also the output polarizations, that is, linearly polarized or unpolarized DD-LC lasers, were determined by the rubbing PI on an output glass plate. From the α-stable distribution, the distinctive operation state of the different configurations of the DD-LC laser can be quantitatively distinguished to reveal the Gaussian and Levy distributions of the FPLs and RLs, respectively. The obviously different output characteristics are attributed to the recurrent light scattering within the LC mixtures at the output plate of the DD-LC lasers and were quantified by the transport mean free path through the measurement of the coherent backscattering technique. An unpolarized RL, outputted from a wedge cell without PI rubbing, revealed relatively low spatial coherence from interference patterns through Young’s double-slit experiment and showed low contrast monochromatic speckle patterns of about 0.039.
Published Version
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