We report on microlasers based on high-quality micropillars with lasing on whispering-gallery modes. Usage of low-absorbing Al0.2Ga0.8As0.9Ga0.1As distributed Bragg reflectors as well as the smooth pillar sidewalls allows us to realize whispering-gallery modes lasing by excitation and collection of emission in the pillar axis direction. As a result, simultaneous whispering gallery modes lasing (comb-like structure) in the wavelength range of 930-970 nm is observed for 3-7 μm pillar diameters. Increase the temperature up to 130 K results single-mode lasing for 5 μm pillars with about 8000 cold cavity quality-factor and 240 μW estimated threshold excitation power.
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Babichev et al. (2024) studied this question.
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