Grating external-cavity laser and quasi-synchronous tuning method thereof

摘要

A method for quasi-synchronous tuning of laser wavelength or frequency of grating external-cavity laser and a corresponding laser are provided. A grating or mirror is rotated around a quasi-synchronous tuning point (P_q) to achieve the quasi-synchronous tuning of frequency selections by grating and resonance cavity, wherein, on the xOy coordinate plane, from the perspective of actual physical space of the laser, the rotation center P_q(x_q, y_q) satisfying the quasi-synchronous tuning condition can be considered as being extended from the rotation center P₀(x₀, y₀) under the conventional synchronous tuning condition to the region enclosed by two parabolas near P₀. According to the present disclosure, approximately-synchronous tuning of laser is achieved with simple and flexible designs.