SEMICONDUCTOR PHOTO-ELEMENT AND EXTERNAL RESONANCE LASER HAVING THE SEMICONDUCTOR PHOTO-ELEMENT

摘要

The present invention provides a semiconductor optical element applicable to an EC-LD or an SLD, and an external cavity laser having the semiconductor optical element. The semiconductor optical element has a pair of cleavage surfaces, and comprises a semiconductor substrate 11 having a base surface and a planer structure provided on the base surface and provided with a waveguide 1 G having an active layer. The waveguide 1G has an end surface with low reflectivity and another end surface with certain reflectivity. The waveguide 1G includes an end portion having a first optical axis in the vicinity of the first end surface 1T L and an end portion having a second optical axis in the vicinity of the second end surface 1T H , the first optical axis being inclined at a first angle Æ L other than zero degree with respect to a normal to the first end surface 1T L , the second optical axis being inclined at a second angle Æ H other than zero degree with respect to a normal to the second end surface 1T H , the first angle Æ L being different from the second angle Æ H . The end portion of the waveguide 1G is different in width from the other end portion of the waveguide 1G.