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Express"],"published-print":{"date-parts":[[2023,6,5]]},"abstract":"<jats:p>We demonstrate low-threshold and wide emission wavelength range hybrid-integrated silicon-thulium microdisk lasers based on a pulley-coupled design. The resonators are fabricated on a silicon-on-insulator platform using a standard foundry process and the gain medium is deposited using a straightforward, low-temperature post-processing step. We show lasing in 40- and 60-\u00b5m diameter microdisks with up to 2.6\u2005mW double-sided output power and bidirectional slope efficiencies of up to 13.4% with respect to 1620\u2005nm pump power launched to the bus waveguides. We observe thresholds less than 1\u2005mW versus on-chip pump power and both single-mode and multimode laser emission spanning across wavelengths from 1825 to 1939nm. 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