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Opt Lett. 2012 Aug 1;37(15):3210-2. doi: 10.1364/OL.37.003210.

Terahertz beat frequency generation from two-mode lasing operation of coupled microdisk laser.

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  • 1Department of Physics, Pusan National University, Busan, South Korea.


We propose a coupled microdisk laser as a compact and tunable laser source for the generation of a coherent continuous-wave terahertz radiation by photomixing. Using the Schrödinger-Bloch model including the nonlinear effect of active medium, we find single-mode and two-mode lasings depending on the pumping strength. We explain the transitions of lasing modes in terms of resonant modes that are the solutions of the Schrödinger-Bloch model without active medium and nonlinear interaction. In particular, a two-mode lasing is shown to generate a terahertz oscillating frequency originating from the light beating of two nearly degenerated resonant modes with different symmetries.

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