Single spatial mode selection in a layered square microcavity laser

Moon, Hee-Jong; An, Kyungwon; Lee, Jai-Hyung
May 2003
Applied Physics Letters;5/5/2003, Vol. 82 Issue 18, p2963
Academic Journal
We propose a scheme for mode selection in a square-shaped two-dimensional layered microcavity laser. By using a fused-silica square-shaped capillary containing a dye-doped liquid as a layered microcavity, whose refractive index was smaller than that of the fused silica, we could realize our idea for single spatial-mode lasing. By analyzing the amount of peak shift induced by varying the refractive index of inner liquid, we could confirm that the lasing modes originate by the free-running trajectories that are constrained on the outer layer by the presence of the inner boundary in such a way that only the ray having a refraction angle of 45° in the inner gain layer could be selected.


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