High-power tunable femtosecond mid-infrared(MIR)pulses are of great interest for many scientific and indus-trial applications.Here we demonstrate a compact fluoride-fiber-based system that generates single solitons tun-able from 3 to 3.8 μm.The system is composed of an Er:ZBLAN fiber oscillator and amplifier followed by a fusion-spliced Dy:ZBLAN fiber amplifier.The Er:ZBLAN fiber amplifier acts as a power booster as well as a frequency shifter to generate Raman solitons up to 3 μm.The Dy:ZBLAN fiber amplifier transfers the energy from the residual 2.8 pm radiation into the Raman solitons using an in-band pumping scheme,and further extends the wavelength up to 3.8 μm.Common residual pump radiation and secondary solitons accompanying the soliton self-frequency shift(SSFS)are recycled to amplify Raman solitons,consequently displaying a higher output power and pulse energy,a wider shifting range,and an excellent spectral purity.Stable 252 fs pulses at 3.8 μm with a record average power of 1.6 W and a pulse energy of 23 nJ are generated.This work provides an effective way to develop high-power widely tunable ultrafast single-soliton MIR laser sources,and this method can facilitate the design of other SSFS-based laser systems for single-soliton generation.

LINPENG YU;JINHUI LIANG;SHITING HUANG;JINZHANG WANG;JIACHEN WANG;XING LUO;PEIGUANG YAN;FANLONG DONG;XING LIU;QITAO LUE;CHUNYU GUO;SHUANGCHEN RUAN

Shenzhen Key Laboratory of Laser Engineering,Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China;Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes,Shenzhen Technology University,Shenzhen 518118,China;Han's Laser Technology Industry Group Co.,Ltd.,Shenzhen 518057,China

光子学研究（英文）

[1]LINPENG YU;JINHUI LIANG;SHITING HUANG;JINZHANG WANG;JIACHEN WANG;XING LUO;PEIGUANG YAN;FANLONG DONG;XING LIU;QITAO LUE;CHUNYU GUO;SHUANGCHEN RUAN-.Generation of single solitons tunable from 3 to 3.8 um in cascaded Er3+-doped and Dy3+-doped fluoride fiber amplifiers)[J].光子学研究（英文）,2022(09):2140-2146

SSFS

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