Abstract
Various dyes are investigated for their capability of generating 3rd harmonic of Nd-laser light. The feasibility of achieving phase matching is demonstrated by direct measurements of the index of refraction. Third-harmonic conversion of hexamethylindocarbocyanine iodide, diethyloxacarbocyanine iodide and fuchsin red are compared. The highest conversion is obtained for hexamethylindocarbocyanine iodide (80 times higher than in fuchsin red). A further enhancement of the third harmonic by a factor of 70 is expected for the fundamental laser light at 1.15 μm.
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Diels, J.C., Schäfer, F.P. Phase-matched third-harmonic generation in dye solutions. Appl. Phys. 5, 197–202 (1974). https://doi.org/10.1007/BF00928129
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DOI: https://doi.org/10.1007/BF00928129