Abstract:A novel high power LD2SLA of GaAlAs/ GaAs maerial has been studied. Device is DHL structure of gain2guide and oxide2strripe. It uses direct coupling of the LD with the SLA. Output power has been amplified an order. High reflecting coatings and anti2reflective on the cavity surface of LD2SLA. The transmission coefficent and reflective coefficient have been changed respectively from 71 % and 29 % ,in the case of without coatings ,to above 90 %. By this ,the device cavity surface have been protected ,the output power increased.