Optical amplification and laser action in cyanine dyes doped in DNA complex

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Because the fluorescence from organic dye is enhanced when it is intercalated or bound to DNA double strands, a lot of studies on optical amplification and lasing have been made. In this study, we investigated the optical and lasing properties of several cyanine dyes incorporated in DNA in solution and complex films. At first, we confirmed that the addition of DNA into dye solutions strongly enhances the fluorescence intensity, and also affects the degree of molecular aggregation. We fabricated the films composed of DNA, dye, and lipid by two methods, and observed the amplified spontaneous emission (ASE) under the excitation of 532 nm laser pulses with sub-mJ energy. We also made a thin film DFB dye laser by forming DNA/dye/lipid films on a grating plate, from which a laser action was observed under optical pumping.

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