High absorption large-mode area step-index fiber for tandem-pumped high-brightnes shigh-power lasers

查看全文 作　　者：KANG-JIE [1]LIM;SAMUEL KA-WEN [1]SEAH;JOASH YONG'EN [1]YE;WENDY WEIYING [1]LIM;CHU-PERNG [1]SEAH;YUNN-BOON [1]TAN;SUTING [1]TAN;HUITING [1]LIM;RAGHURAMAN [2]SIDHARTHAN;ARUMUGAM RAJENDRA [1]PRASADH;CHEN-JIAN [2]CHAN;SEONGWOO [2]YOO;SONG-LIANG [1]CHUA

机构地区：[1]DSO National Laboratories,118225 Singspore,Singapore;[2]School of Electrical and Eiectrornic Engineering,Nanyang Technological University,639798 Singapore,Singapore

出　　处：《Photonics Research》索引2020年第8卷第10期,共6页

摘　　要：A short absorption length ytterbium(Yb)-doped large-mode area(LMA)fiber is presented as a step forward to mitigate the stern problem of nonlinear scatterings in a tandem pumping scheme adopted for high-power fiber laser.The short absorption length was realized by incorporating high Yb concentration in the fiber core.Furthermore,by replacing the inherent silica cladding with a Ge-doped cladding,we were able to obtain low core numerical aperture(NA)and negate the detrimental effect of index-raising by high Yb concentrations.This overcomes the long-standing limitation in step-index Yb-doped fibers(YDFs)where high cladding absorption inevitably results in high NA,thus hampering single-mode operation.We report an LMA(~575μm^2)YDF with NA of 0.04 and absorption of 27 dB/m at 976 nm both traits promote power scaling of single-mode tandem pumped fiber lasers.To our knowledge,this is the highest cladding absorption attained in a low-NA step-index fiber to date.An all-fiber tandem-pumped amplifier was built using only^14 m of the YDF.The amplifier delivered a near-Gaussian beam(M^i.27)at 836 W output power(pump power limited)with a high slope efficiency of^83%.Thanks to the short length and the tandem pumping,no indication of limiting factors such as stimulated Raman scattering,photodarkening,and transverse mode instability was observed. 关键词：FIBER PUMPED power

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High absorption large-mode area step-index fiber for tandem-pumped high-brightnes shigh-power lasers

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