Patent ID: 7593446
Filing Date: 2009-09-22
Classification: H01S

Abstract:
1. Semiconductor laser comprising: a substrate providing the mechanical support function, an active area, in which is propagated along a propagation axis a light beam having a wavelength, a top waveguide, a bottom waveguide, said active area comprising a refractive index profile modulated so that said refractive index varies periodically along the propagation axis and has a period Λ, the Fourier series breakdown of said modulated refractive index n x being expressed where N is called the Fourier order, α N is the Nth order Fourier coefficient of said refractive index profile n x , and i is such that i 2 =−1, wherein the period Λ of said refractive index profile n x is such that there is an integer k greater than or equal to 1 for which the following parameter is a complex number, the imaginary part of which is less than approximately a tenth of the real part; wherein the active area is a stack of thin layers: GaAs and AlGaAs, AlInAs and GaInAs, or InAs and AlSb.