We report on the realization of an optically pumped monolithic vertical‐cavity surface‐emitting laser operating at a wavelength of 511 nm. The structure consists of a ZnSSe λ‐cavity containing three ZnCdSSe quantum wells surrounded by two Bragg reflectors using ZnSSe for the high‐index material and MgS/ZnCdSe superlattices for the low‐index material. The microresonator has a quality factor of 3200 while the threshold excitation power density for the onset of lasing is 22 kW/cm2 at room temperature. Micropillars of different diameter fabricated out of this structure show discrete optical modes due to the three dimensional optical confinement of the optical wave.

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