Band-tunable color cone lasing emission based on dye-doped cholesteric liquid crystals with various pitches and a pitch gradient Lee, C. -R. ; Lin, S. -H. ; Yeh, H. -C. ; Ji, T. -D. Abstract Publication: Optics Express Pub Date: December 2009 DOI: 10.1364/OE.17.022616 Bibcode: 2009OExpr..1722616L