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, {HEAD ~ all} of which are fixed to {TAIL ~ a base member} of a material, such as metal, by soldering or the like 
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 , { HEAD ~ all } of which are fixed to { TAIL ~ a base member } of a material , such as metal , by soldering or the like
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