Patent ID: 6600764
Filing Date: 2003-07-29
Classification: H01S

Abstract:
A semiconductor diode laser operation at a wavelength &lgr;0, comprising:(a) a single-mode section having a first width S0, a first length L0, an index of refraction n at &lgr;0, and a refractive index step &Dgr;n at &lgr;0, wherein the width of S0 satisfies an equation S0 0/(8*&Dgr;n*n)1/2; (b) a power-supply section having a second width Sp, wherein the width of Sp satisfies an equation Sp>&lgr;0/(8*&Dgr;n*n)1/2; and (c) a mode-transformer section coupled to the single-mode section and to the power-supply section, wherein the mode-transformer has a second length L, a first width S0 where the mode-transformer section couples to the single-mode section, a second width Sp where the mode-transformer section couples to the power-supply section, and a width that varies between S0 and Sp along the length L, wherein the length L and the second width Sp are relationally selected to couple energy substantially adiabatically through the mode transformer section from the single-mode section to the power-supply section, and wherein the length L0 is selected to be sufficiently long to substantially suppress all but a single mode of lasing in the semiconductor diode laser.