Patent ID: 6996152
Filing Date: 2006-02-07
Classification: B82Y,H01S

Abstract:
1. A photonic-crystal distributed-feedback laser with an output power, a beam quality, a wavelength spectrum, and a product of a modal loss and a linewidth enhancement factor, comprising: a laser cavity with a waveguide structure that has a cavity length L an active region for producing optical gain upon receiving optical pumping or an input voltage; at least one layer including a periodic two-dimensional grating with modulation of a modal refractive index, said grating being defined on a rectangular lattice with a first period along a first axis of said grating and a second period along a second perpendicular axis of said grating; said grating produces three diffraction processes having coupling coefficients κ a lateral gain area contained within a second area patterned with said grating that has substantially a shape of a gain stripe with a width W, with said gain stripe tilted at a first tilt angle relative to the two mirrors; and wherein said rectangular lattice of said grating is tilted at a second tilt angle substantially the same as the first tilt angle with respect to said gain stripe and the ratio of said first and second grating periods is equal to the tangent of said first tilt angle, with said first tilt angle being between about 16° and about 23°.