| http://www.w3.org/ns/prov#value | - An object of the present invention is to solve various problems of the conventional techniques and provide a method of stabilizing the frequency of semiconductor laser precisely in a wavelength region of from 1.52 ??m to 1.57 ??m, which is important in light transmission techniques, optical measurement techniques, optical memory techniques and the like, particularly from 1.54 ??m to 1.56 ??m cente
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