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We propose a coupled microdisk laser as a compact and tunable laser sourcefor the generation of a coherent continuous wave THz radiation by photomixing.Using the Schr\"odinger-Bloch model including the nonlinear effect of activemedium, we find single mode and two mode lasings depending on the pumpingstrength. We explain the transitions of lasing modes in terms of resonant modeswhich are the solutions of the Schr\"odinger-Bloch model without active mediumand nonlinear interaction. In particular, a two mode lasing is shown togenerate THz oscillating frequency originating from the light beating of twonearly degenerated resonant modes with different symmetries.

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