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Materials 2016, 9(9), 725;

Low–Threshold and High Intensity Random Lasing Enhanced by MnCl2

School of Physics, Beijing Institute of Technology, Beijing 100081, China
Author to whom correspondence should be addressed.
Academic Editor: Christof Schneider
Received: 10 July 2016 / Revised: 17 August 2016 / Accepted: 19 August 2016 / Published: 24 August 2016
(This article belongs to the Section Energy Materials)
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Energy transfer is known to have a significant influence on random lasers. However, the study about the effect of energy transfer between metallic salt and dye molecules on random lasers is still lacking at present. Here, we investigate random lasing actions in Pyrromethene-597 (PM597), PM597-doped MnCl2 (manganese (II) chloride), PM597-doped polymer-dispersed liquid crystal (PDLC) and PM597-doped PDLC with MnCl2 capillary systems. We find that random lasing of the systems with MnCl2 exhibits lower threshold, higher intensity, sharper peak and variable resonance wavelength in comparison with the systems without MnCl2. This behavior is closely related to the decrease of fluorescence quenching effect and the enhancement of local field induced by energy transfer between MnCl2 and PM597. Red-shift of wavelength is observed with increasing dosage concentration of MnCl2 in the PM597-doped PDLC with MnCl2 system. Through the analysis of single-shot emission spectra of PM597-doped PDLC without and with MnCl2 systems, the role of MnCl2 in the coupling of lasing modes is confirmed. Lengths of laser oscillation cavities of the PM597-doped PDLC without and with MnCl2 systems are calculated by a power Fourier transform (PFT) analysis of their emission spectra. It well accounts for the effect of MnCl2 on the variation of the oscillation cavity. View Full-Text
Keywords: MnCl2; random lasing; polymer dispersed liquid crystal; low-threshold MnCl2; random lasing; polymer dispersed liquid crystal; low-threshold

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shang, Z.; Yang, M.; Deng, L. Low–Threshold and High Intensity Random Lasing Enhanced by MnCl2. Materials 2016, 9, 725.

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