Wereportanall-fiberhighpower,singlefrequencylarge-modearea(LMA)linearlypolarizedytterbiumdopedfiberamplifiers(YDFA)module,whichisbasedonthemasteroscillatormulti-stagepoweramplifiers(MOPA).Themaximumoutputpoweris43.8Watawavelengthof1064nmwhen60-Wlaunchedpumplightiscoupled,withhighslopeefficiencyof88%,polarizationextinctionrate(PER)>17.2dBandnearlydiffraction-limitedbeamquality(M2<1.1).
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