Journal
OPTICS EXPRESS
Volume 23, Issue 8, Pages 10168-10180Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.010168
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Funding
- National Science Council of the Republic of China, Taiwan [MOST 103-2112-M-006-012-MY3]
- Advanced Optoelectronic Technology Center, National Cheng Kung University, under the projects of the Ministry of Education
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This work investigates the performance evolution of color cone lasing emissions (CCLEs) based on dye-doped cholesteric liquid crystal (DDCLC) cells at different fabrication conditions. Experimental results show that the energy threshold (E-th) and relative slope efficiency (eta(s)) of the lasing signal emitted at each cone angle (0 degrees-35 degrees) in the CCLE decreases and increases, respectively, when the waiting time in a homogenously rubbed aligned DDCLC cell is increased from 0 hr to 216 hr (9 days). This result occurs because defect lines gradually shrink with the anchoring of the surface alignment when the waiting time is increased. Hence, the scattering loss decreases, and the dwelling time of the fluorescence photons in the resonator increases, which in turn enhances the CCLE performance. With the aligned cell given the pretreatment of a rapid annealing processing (RAP), the waiting time for obtaining an optimum CCLE can markedly be reduced sixfold. The surface alignment of the DDCLC cell also plays a necessary role in generating the CCLE. This work provides an insight into the temporal evolution of the performance for the CCLE laser and offers a method (RAP) of significantly speeding up the formation of a CCLE laser with optimum performance. (C) 2015 Optical Society of America
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