Quantum-dot (QD) photonic-crystal (PC) surface-emitting laser (SEL) devices with bottom\ndistributed Bragg reflector (DBR) were fabricated based on vertical-cavity SEL structure with top DBR\ncompletely removed. Two-dimensional (2D) PCs were deeply etched through QD multilayers to yield\nstrong diffraction coupling. Room-temperature optically pumped lasing emissions at 1194 nm and\n1296 nm were demonstrated for two lattice periods of 360 nm and 395 nm, respectively. Two lasing\nwavelengths separated over 100 nm; however, there were less than two times difference in threshold\npower densities while slope efficiencies were comparable. The unique spectral gain characteristics of\nQDs were considered in interpretation of gain-cavity detuning. Moreover, simulation revealed the\nsub-cavity should be designed so that its resonant wavelength is in phase with lasing wavelength.
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