Multicolor Semiconductor Lasers

The ever-increasing demand for information density and accuracy in highly integrated photonic devices calls for miniaturization of a coherent light source with broadband tunability and high stability. Wavelength tuning range, cavity Q factor, and threshold are three indicators of evaluating the performance of a nanoscale laser. Herein, the latest, effective materials and fundamental structures for multicolor semiconductor lasers including low dimensional II-VI semiconductors, III-V semiconductors, and lead halide perovskites are reviewed. Composition and bandgaps, novel cavity designs, lasing wavelength, Q factors of resonators, and lasing thresholds of the multicolor semiconductor lasers are compared and discussed. Finally, a summary and a future perspective of broadband tunable semiconductor lasers are given.