Apparatus and method for laser frequency doubler utilizing PPLN waveguide

摘要

An apparatus and a method for frequency doubling of a fiber coupled diode laser that provides substantially enhanced power output in the visible region, is disclosed. This apparatus and method can be used in many applications in areas such as display, bio- and medical-instrumentation. A key step of the method is to couple a diode laser with a waveguide of periodically poled lithium niobate (PPLN) through a polarization maintaining fiber and a Fiber Bragg Grating (FBG) that is coupled to the laser diode and serves as the end mirror of the laser cavity.