27 July 1994 Long-wavelength fluorescent probes--chemistry and semiconductor lasers: a difficult marriage
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The utility of having commercially available semiconductor laser diodes (wavelengths above 680 nm) that match the absorption maximum of near-infrared dyes will be discussed. The large gaps that exist between available wavelengths has limited the use of many new NIR dyes in many fields especially in optical fiber applications. Several 2,3-naphthalocyanine dyes have been synthesized with different moieties which produce a bathochromic shift of the absorbance maximum as compared to the unsubstituted dye. The utility of NIR dyes with absorbance maximum close to the output wavelength of commercially available laser diodes is illustrated by using an optical fiber instrument developed for the detection of metal ions. Detection of contaminants in the picomolar range will be discussed. Excitation of the dye/analyte complex induced with a semiconductor laser diode and emission intensity signal collected at 820 nm will be discussed. The use of Acoustic Optical Tunable Filter (AOTF) filters to fill existing gaps in commercially available laser wavelength and the tuning of light sources using an AOTF will also be discussed. The development of these systems will allow the manufacturing of portable optical fiber detectors for applications in industry, medicine and the environment.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. A. Casay, Tibor Czuppon, and Gabor Patonay "Long-wavelength fluorescent probes--chemistry and semiconductor lasers: a difficult marriage", Proc. SPIE 2138, Longer Wavelength Lasers and Applications, (27 July 1994); doi: 10.1117/12.181362; https://doi.org/10.1117/12.181362


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