Patent ID: 7974328
Filing Date: 2011-07-05
Classification: H01S

Abstract:
1. A surface-emission type semiconductor laser employing a dielectric distributed Bragg reflector and on an opposite side thereof, a semiconductor distributed Bragg reflector, and comprising a resonator part made up of a semiconductor sandwiched by the dielectric distributed Bragg reflector and the semiconductor distributed Bragg reflector, wherein relative to a lasing wavelength λ an optical path length L of said resonator part made up of the semiconductor is selected such that 0.9×λ in relation to a light of lasing wavelength λ when denoting: a refraction index of a semiconductor making up a portion of said resonator part made up of the semiconductor, which portion is in contact with the semiconductor distributed Bragg reflector, by a symbol n refraction indexes of a high refraction-index layer and a low refraction-index layer, which compose said semiconductor distributed Bragg reflector, respectively by symbols n an average refraction index determined by averaging the refraction index regarding a semiconductor making up a portion of said resonator part made up of the semiconductor, which portion is in contact with the dielectric distributed Bragg reflector, over a range where the optical path length measured from the contact interface is within ¼ of the lasing wavelength λ refraction indexes of a high refraction-index layer and a low refraction-index layer, which compose said dielectric distributed Bragg reflector, respectively by symbols n semiconductor materials composing the resonator part made up of the semiconductor, semiconductor materials making up the high refraction-index layer and the low refraction-index layer of the semiconductor distributed Bragg reflector, and dielectric materials making up the high refraction-index layer and the low refraction-index layer of the dielectric distributed Bragg reflector are selected such that n n where n S1 >n L1 and f(n g(n h(n