A laser unit includes a semiconductor laser tip mounted on a substrate of a material such as Si, a monitoring photodiode, and a laser driving integrated circuit, all of which are fixed to a base member of {HEAD ~ a material}, such as {TAIL ~ metal}, by soldering or the like 
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A laser unit includes a semiconductor laser tip mounted on a substrate of a material such as Si , a monitoring photodiode , and a laser driving integrated circuit , all of which are fixed to a base member of { HEAD ~ a material } , such as { TAIL ~ metal } , by soldering or the like
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