Answer the following question: What type of details about izuo hayashi can be gathered from the following bio? Bio: hayashi was born in tokyo in 1922 and graduated from the faculty of science , university of tokyo in 1946 . he worked as assistant professor at the institute for nuclear research of the same university and defended his phd in 1962 . after the phd defense , he stayed for a year at mit , and between 1964 and 1971 worked at bell labs on semiconductor lasers . in 1971 he joined the research laboratories of nec where he continued his studies of semiconductor lasers , aiming to improve their reliability and lifetime . between 1982 and 1987 he was a head scientist at nec and in 1987 -- 1994 became director of the optoelectronics technology research laboratory in tsukuba . from 1994 till retirement in 1996 he served as advisor in the same laboratory . hayashi died of acute leukemia in 2005 .
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