26 August 2010 Low threshold laser emissions from dye-doped polymer films in photonic crystal cavity
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In order to obtain high optical gain medium for low-threshold and compact polymeric lasers, a tert-butyl substitutional rhodamine B (t-Bu-RhB) was synthesized and doped in PMMA film. The optical properties were investigated and the results showed that the concentration of t-Bu-RhB in PMMA could be increased to 6.9 wt % without decrease of photoluminescence efficiency. Polystyrene (PS) PCs with bandgap of 595nm were fabricated by vertical-deposition method. Resonator cavity was constructed by sandwiching t-Bu RhB doped films with two PS PCs. When excited by a Nd:YAG laser beam(532nm,10Hz,8ns), single-mode laser emission was observed from the cavities with dye concentration of 3, 5, 6.9, 10 wt %. Lasing emission is located at 592nm, with the full-width at half-maximum (FWHM) of 1nm. Lasing threshold of the cavities dramatically decreased from 49.56 to 0.70 μJ/Pulse when the concentration of t-Bu RhB increased from 3 to 6.9 wt%. Through enhancing the dye concentration to decrease lasing threshold will save pump energy, which is not only important for economy of energy, but also in favor of extending the life of such laser devices.
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Lan-Ting Shi, Lan-Ting Shi, Feng Jin, Feng Jin, Wei-Qiang Chen, Wei-Qiang Chen, Zhen-Sheng Zhao, Zhen-Sheng Zhao, Xuan-Ming Duan, Xuan-Ming Duan, } "Low threshold laser emissions from dye-doped polymer films in photonic crystal cavity", Proc. SPIE 7774, Linear and Nonlinear Optics of Organic Materials X, 77740V (26 August 2010); doi: 10.1117/12.859997; https://doi.org/10.1117/12.859997

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