A coupled-cavity mini-array VCSEL for CW THz generation

In this paper, a 2x1 mini-array VCSEL is studied as a source of CW THz radiation. The frequency of the signal can be tuned by current up to 9.5mA, at which the laser features optical beatings up to 300GHz, which are converted to corresponding THz frequencies by photomixing. The influences of the laser current on the optical spectrum of the laser, and thus on the THz signal are also investigated. With its simpleness, compactness and extremely low cost, the mini-array VCSEL has the potential to replace other laser sources to promote CW THz applications in industry.