Patent ID: 7974328

Claim:
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 0 of said surface-emission type semiconductor laser, an optical path length L of said resonator part made up of the semiconductor is selected such that 0.9×λ 0 ≦L≦1.1×λ 0 ; and in relation to a light of lasing wavelength λ 0 , 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 S2 ; 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 H2 and n L2 ; 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 0 by a symbol n S1 ; and 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 H1 and n L1 , 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 S1 , n H1 , and n L1 satisfy the following condition defined by equation (1), and n S2 , n H2 , and n L2 satisfy the following condition defined by equation (2): n H1 >f ( n S1 ) n L1 2 +g ( n S1 ) n L1 +h ( n S1 ) (1) where n S1 >n L1 and f(n S1 )=0.0266 n S1 2 −0.2407 n S1 +0.6347 g(n S1 )=−0.0508 n S1 2 +0.4335 n S1 −0.0085 h(n S1 )=0.0382 n S1 2 −0.3194 n S1 +0.7398 ( n H2 −n L2 )>0.4, where n H2 >n L2 and n S2 >n L2 . (2)