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.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: June 5, 2012
Revised Manuscript: June 27, 2012
Manuscript Accepted: June 28, 2012
Published: July 26, 2012
Jung-Wan Ryu, Jinhang Cho, Chil-Min Kim, Susumu Shinohara, and Sang Wook Kim, "Terahertz beat frequency generation from two-mode lasing operation of coupled microdisk laser," Opt. Lett. 37, 3210-3212 (2012)