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-only controls, the composite yields denser random lasing peaks, stronger spectral modulation, and higher slope efficiency. The RFL shows an estimated lasing threshold of 59 mW and an optical signal-to-noise ratio of 26.81 dB at 189 mW. Diameter-dependent performance is nonmonotonic; among the tested diameters, the 7.5 mm droplet provides the strongest spectral concentration and background suppression and the lowest measured low-frequency relative intensity noise (-76.61 dB/Hz at 122 mW).
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Fei et al. (2026) studied this question.
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