Patent ID: 6697407
Filing Date: 2004-02-24
Classification: H01S

Abstract:
A semiconductor laser comprising:an n-type semiconductor substrate having a (100) crystal plane as an upper surface; a mesa stripe portion having a trapezoidal shape and formed along a <011> direction, said mesa stripe portion including an n-type first clad layer, an active layer, and a p-type second clad layer, which are successively formed on the n-type semiconductor substrate; a current blocking portion comprising a p-type current blocking layer formed outside the mesa stripe portion and on the n-type semiconductor substrate, and an n-type current blocking layer formed on the p-type current blocking layer; and a p-type third clad layer simultaneously covering both an upper surface of the mesa stripe portion and an upper surface of the current blocking portion, wherein an inclination of a side surface of the mesa stripe portion is set at an angle within +1Â° to +5 or âˆ’1 to âˆ’5Â° of an inclination angle of a (111)B crystal plane, such that when the inclination angle of the (111)B plane is approximately 55Â° the inclination of the side surface of the mesa stripe is approximately 56Â° to 60Â° or 50Â° to 54Â°.