Effect of combined laser dyes on the efficiency of cholesteric liquid crystal lasers

AbstractA high efficiency band-edge cholesteric liquid crystal (CLC) laser comprising an optimal binary-dye mixture (OBD) with ۶۲ wt% DCM and ۳۸ wt% PM۵۹۷ as the active medium is scrutinized. The measurements indicate that both the fluorescence spectrum width and the order parameter of OBD in the host of nematic liquid crystal (BL۰۰۹) enhance compared with those for each individual dye. Furthermore, at the fluorescence peak, the optical efficiency of the PM۵۹۷-doped CLC laser is ~ ۱.۵× higher than that of DCM, and the laser emission energy for OBD-doped CLC between the wavelengths ۵۹۵ nm and ۶۱۳ nm is even higher than that of PM۵۹۷-doped CLC, so that at the maximum fluorescence of OBD, λ≈۶۰۵nmdocumentclass[۱۲pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-۶۹pt} egin{document}lambda approx ۶۰۵;{ ext{nm}}end{document}, the improvement is over ۲۰%.

کلیدواژه ها:

Binary ، dye mixture ، Band ، edge laser ، Fluorescence spectrum ، Slope efficiency