Patent ID: 6195375
Filing Date: 2001-02-27
Classification: B82Y,H01S

Abstract:
A self-pulsation type semiconductor laser, comprising:a first conductivity type first clad layer,an active layer formed on the first clad layer;a second conductivity type second clad layer formed on the active layer;a current narrowing structure comprising first conductivity type current narrowing layers buried at portions at the two sides of a stripe portion formed in the second clad layer;saturable absorbing regions formed on the two sides of the active layer inside a laser resonator; anda holding mechanism for holding a predetermined refractive index difference .DELTA.n of a waveguide in a horizontal direction parallel to a pn junction and perpendicular to a longitudinal direction of the resonator within a range capable of continuously generating pulsation;a thickness d of the second clad layer outside the waveguide being set to a small value capable of suppressing the spread in the horizontal direction of a current introduced to the active layer through the stripe portion to close to a stripe width W of a bottom portion of the stripe portion.