Patent ID: 8565276

Claim:
A method for making a high power laser source of more than one W, said laser source including a bar of laser diodes having a light-emitting active semiconductor region, a cooling element and a submount between said laser bar and said cooling element, said laser bar having a first coefficient of thermal expansion (CTE bar ), said submount having a second coefficient of thermal expansion (CTE sub ), said cooling element having a third coefficient of thermal expansion (CTE cool ), and a submount/cooler assembly consisting of said submount and said cooling element, said submount/cooler assembly having an effective fourth coefficient of expansion (CTE eff ), wherein selecting said fourth coefficient (CTE eff ) different by a predetermined amount from said first coefficient (CTE bar ), CTE eff ≠CTE bar , hard soldering said bar of laser diodes to said submount and hard soldering said submount to said cooling element, thereby stressing said laser bar's active region to effect a deformation of its semiconductor crystal lattice.