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Lett."],"published-print":{"date-parts":[[2022,10,1]]},"abstract":"<jats:p>Yttrium calcium oxyborate (YCOB) crystals have been widely applied for generating intense near-infrared laser pulses by optical parametric amplification. Here, we show that the YCOB crystals oriented in both the XZ and XY principal planes possess broadband phase-matching property of intrapulse difference-frequency generation in the mid-infrared region. Few-cycle pulses tunable from 2 to 4\u2005\u00b5m are experimentally produced by using a 7.5-fs pump laser at 800\u2005nm, in which the conversion efficiency can be as high as 2.5%. 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