LOS GATOS, Calif., Feb. 14 -- Positive Light Inc. announced yesterday it has signed a definitive agreement to be acquired by Coherent Inc., of Santa Clara. The transaction is expected to close at the end of March 2003. Positive Light makes advanced solid-state lasers for the scientific and industrial markets. Jeremy Weston, president of Positive Light, said, "Positive Light has a long standing commitment to provide advanced solid-state laser systems to scientific and industrial markets. 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