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| Nanosecond optical switching in a liquid crystal cavity. In (a) A 532 nm pump pulse (blue) excites the dye-doped droplet, initiating lasing and the emission of whispering gallery modes (green). (b) A red-shifted stimulated-emission depletion (STED) pulse (red), introduced before lasing begins, depletes the excited state and suppresses lasing, switching the output from green to red. Credit: V. Sharma et al., doi 10.1117/1.AP.8.2.026009. |
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