TRANSVERSE MODE FILTERING
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Xerox Disclosure Journal
One manner of providing transverse mode control in a double heterostructure (DH) diode laser is to change the composition of one or more layers of the structure along the plane of the p-n junction. By changing the layer composition, a lateral refractive index profile is, in effect, created. The effective index of refraction is made greater between the dotted lines of DI-I laser shown in the figure. In the pumped area of the DH laser, losses along the plane of the p-n junction are greater for higher order transverse modes, The higher order modes have a higher threshold and do not oscillate.