Light amplification in a thin film

M. S. Chang*, P. Burlamacchi, Chen-Ming Hu, J. R. Whinnery

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Light amplification at 6328 Å in a rhodamine-B-doped polyurethane thin film is observed. The light-guiding thin film is pumped transversely with a nitrogen laser. Superradiant light of the dye-doped film is observed to be guided by the thin film. When a He-Ne light at 6328 Å is coupled into the same thin film along the same path, amplification results. Maximum unsaturated gain on the order of 13 cm-1 was experimentally determined by two different methods in a single-mode thin-film light guide with a concentration of 3.3×10-2 mol/liter when wet.

Original languageEnglish
Pages (from-to)313-314
Number of pages2
JournalApplied Physics Letters
Issue number8
StatePublished - 1 Dec 1972


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