Widely tunable amplified spontaneous emission of Pyrromethene-650-doped nematic liquid crystal |
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Authors: | Rongwei Fan Yugang Jiang Yuanqin Xia Deying Chen |
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Affiliation: | 1.National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin,China |
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Abstract: | We study amplified spontaneous emission of Pyrromethene-650-doped nematic liquid crystal deposited onto quartz and glass substrates. We prepare samples with different dye-doped concentrations pumped with a Nd:YAG laser at 532 nm. With an applied electric field, a tuning range of the amplified spontaneous emission of more than 20 nm was realized in each sample due to changing the effective refractive index of the nematic-liquid-crystal layer caused by the reorientation of nematic-liquid-crystal molecules. We show that there exist a threshold voltage and a saturation voltage for all the samples. With the increase in the dye-doped concentration, the peak wavelength of the amplified spontaneous emission has a red shift of about several nanometers. |
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