Semiconductor lasers

摘要

There is disclosed an improved semiconductor laser device (10;10a), eg a single mode index guided laser diode. The device (10;10a) comprises: an optical waveguide (15;15a); at least one electrical contact (20;20a) extending along part of a length of the waveguide (15;15a); and wherein the at least one electrical contact (20;20a) is shorter than the optical waveguide (15;15a). By this arrangement a part or parts of the waveguide (15;15a) are not electrically pumped, in use.