| 摘要 |
A laser sensor includes a laser resonator, with an efficient reflector at a first end of the resonator and a partially reflecting output coupler at a second end of the resonator. A gain medium is positioned between the reflector and the output coupler with a source of pumping energy directed into the gain medium. A perturbation sensitive element is positioned within the laser resonator to cause differences in the optical path lengths of first and second polarization modes of a coherent beam in the resonator in response to an external perturbation. A polarizing beam splitter separates the coherent beam into a first polarization mode beam and a second polarization mode beam, and a polarization rotator rotates the polarization of the first mode beam such that it is parallel to the polarization of the second mode beam. The first and second mode beams are recombined to cause interference between the beams and thereby produce a fringe pattern whose motion is indicative to a perturbation impacted to the perturbation sensitive element. |
