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