Single high-order round-trip feedback effects in orthogonally polarized dual frequency laser

Zeng, Z.; Zhang, S.; Tan, Y.; Zhang, P.; Li, Y.
May 2012
Applied Physics B: Lasers & Optics;May2012, Vol. 107 Issue 2, p333
Academic Journal
We present the effects of single high-order round-trip feedback in orthogonally polarized dual frequency laser. The high quality intensity fringes of two orthogonally polarized lights are obtained, which are cosine-like. The fringe frequency of a single high-order round-trip feedback is five times that of the conventional optical feedback. Even higher frequencies are possible with this setup. Particularly, there is a phase difference between two orthogonal polarized lights in single high-order round-trip feedback and the phase difference is determined by the feedback order, the length of the external cavity, and the frequency difference of the two orthogonal polarized lights. A theoretical analysis based on a compound cavity model of a dual frequency laser agrees well with the experimental results. These results provide a potential application in precision measurement with both directional discrimination and high optical resolution.


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