End-Pumped Stimulated Emission from a Thiacarbocyanine Dye

Using the same technique employed
¹
in obtaining stimulated emission from chloro-aluminum phthalocyanine (CAP) solutions (where the beam from a giant-pulse ruby laser was caused to impinge transversely upon a cell filled with a dye solution and located within a secondary resonating cavity), we recently observed intense stimulated emission from a commercially available photosensitizing dye, 3, 3′-diethylthiatricarbocyanine iodide (hereafter, “DTTC”). Both methyl and ethyl alcohol were successfully used as solvents. This result and that of Ref. 1 combine to suggest that many other known photosensitizing dyes can be made to emit coherent beams of light similarly.