Patent ID: 8681825
Filing Date: 2014-03-25
Classification: H01S

Abstract:
1. A method for quasi-synchronous tuning of a grating external-cavity laser to achieve quasi-synchronous tuning of frequency selections, wherein the laser comprises a semiconductor laser diode, a grating, and a mirror, the method comprising: determining a synchronous tuning point P determining a quasi-synchronous tuning range by: determining an optical length l(α) and a boundary condition at which mode hopping occurs: wherein the quasi-synchronous tuning range comprises a region in the X-Y plane comprising points whose corresponding frequency tuning range being not less than Δv, where: selecting one point in the quasi-synchronous tuning range as a quasi-synchronous tuning point P rotating the grating or the mirror around the quasi-synchronous tuning point, wherein a distance from the quasi-synchronous tuning point to a plane on which a diffraction surface of the grating lies or to a plane on which a reflection surface of the mirror lies does not change during the rotation about the quasi-synchronous tuning point.