Unidirectional single-frequency lasing from a ring-spiral coupled microcavity laser

Wu, Xiang; Li, Hao; Liu, Liying; Xu, Lei
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p081105
Academic Journal
A ring-spiral coupled microcavity laser was fabricated. The ring resonator works as an oscillator and has a diameter that is slightly less than that of the spiral cavity. The spiral provides wavelength selective feedback and emits light out from the notch. As a result, the coupled cavity generates unidirectional single-frequency laser emission. Its lasing threshold is also significantly lower than a single spiral-shaped microcavity laser.


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