Patent ID: 6272161
Filing Date: 2001-08-07
Classification: H01S

Abstract:
A diode laser comprising:an asymmetric low confinement waveguide including several semiconductor layers each having selected optical properties:an active region in the layers where the radiation generation is produced;said active region being located asymmetrically relative to the waveguide and at an extremity of a waveguide central layer, said layers being constructed to accept only a fundamental transversal mode wavelength by restricting the sum of bump magnitudes of the waveguide central layer and of the active region to less than .lambda./4;said layered structure having a confinement factor for the active region which is less than 2% which is formed by attracting the maximum of the radiation field distribution toward the middle of the waveguide central layer, said waveguide central layer having a bump magnitude which is much larger than the bump magnitude of the active region and by pushing the maximum of the radiation field distribution away from the active region as a result of an optical wall built from or in a final contact confinement layer;said diode laser having a window region with a window waveguide having an adequate crystalline structure which is nonabsorbing for the radiation emitted by the laser;whereby, in the window waveguide, the maximum of the radiation field distribution is attracted toward the middle of the central layer such that the optical properties of the window waveguide assure an overlapping coefficient for the two waveguides, the window waveguide and the rest of the diode laser waveguide, which is greater than 98% to provide propagation up to a mirror into a window waveguide similar to the waveguide defined in the rest of the diode laser.