| 摘要 |
A wavelength tuneable laser source with an external cavity and utilizing an interferometer having a reciprocal output and a non-reciprocal output. The laser source includes an amplifier medium, a cavity comprising two reflectors and a source beam extraction system, a diffraction grating located in the cavity. At least one of the two reflectors are rotatable so as to tune a wavelength. The source beam extraction mechanism includes a beam splitter for splitting an input beam into first and second secondary beams. The first and second secondary beams are parallel to one another. The source beam extraction mechanism also includes a retro-reflecting mechanism for redirecting the first and second secondary beams toward the beam splitter. A non-reciprocal output beam is obtained from a reciprocal source beam using the interferometer.
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