| http://www.w3.org/ns/prov#value | - the semiconductor laser including (n???1) light feedback elements, each arranged at an optical distance Li from a front facet on an optical path of the output light (where i=2 to n, and n is a positive integer not less than 2), and an optical distance between adjacent light feedback elements among the (n???1) light feedback elements is not smaller than 50 cm; and
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