| http://www.w3.org/ns/prov#value | - Further, as examples of modification for the vertical structure of the basic laser diode, there have been known a laser diode having a optical guide layer 2 (LOC structure) as shown in FIG. 7, a laser diode having a optical guide layer disposed on both sides (SCH structure) and a laser diode in which the composition of a optical guide layer is gradually varied in order to change the refractive ind
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