LASER-DIODE ASSEMBLY WITH EXTERNAL BRAGG GRATING FOR NARROW-BANDWIDTH LIGHT AND A METHOD OF NARROWING LINEWIDTH OF THE SPECTRUM

摘要

Proposed are a laser-diode assembly with external Bragg grating for narrow-bandwidth light and a method of narrowing linewidth of the spectrum. A laser-diode assembly comprises a light source in the form of a semiconductor laser diode coupled via a first microoptical coupling device to one end of a first optical fiber. The other end of this fiber is coupled to a second or an output fiber via a second microoptical coupling device. The assembly is characterized by the fact that a laser cavity is extended rearward from the back facet of the laser diode and that the Bragg grating is located in the extended part of the cavity, so that the Bragg grating fulfills three functions, i.e., narrowing of the linewidth, frequency stabilization, and reflection of a portion of light to the resonator chamber.