Deformed square resonators with the flat sides replaced by circular sides areproposed and demonstrated to enhance mode Q factors and adjust transverse modeintervals using the regular ray dynamic analysis and numerical simulations.Dual-transverse-mode emissions due to the ultrahigh-Q factors with differentwavelength intervals are realized experimentally for AlGaInAs/InP circular-sidesquare microlasers, and the stationary condition of the dual-mode emission issatisfied because the high-Q confined modes have totally different modenumbers. Furthermore, optical frequency combs are generated using the dual-modelasing microlaser as a seeding light source by cascaded four-wave mixing in ahighly nonlinear optical fiber.
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