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We have observed that when a specific phthalocyanine solution (chloro-aluminum phthalocyanine dissolved in ethyl alcohol) is irradiated by a sufficiently powerful beam from a giant-pulse ruby laser, there occurs intense stimulated emission from the phthalocyanine molecules. The wavelength of this stimulated emission is centered at approximately 0.755 µ. Its spectral half-width was observed to be some 5 cm−1.
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