High-power femtosecond mid-infrared(MIR)lasers are of vast importance to both fundamental research and applications.We report a high-power femtosecond master oscillator power amplifier laser system consisting of a sin...High-power femtosecond mid-infrared(MIR)lasers are of vast importance to both fundamental research and applications.We report a high-power femtosecond master oscillator power amplifier laser system consisting of a singlemode Er:ZBLAN fiber mode-locked oscillator and pre-amplifier followed by a large-mode-area Er:ZBLAN fiber main amplifier.The main amplifier is actively cooled and bidirectionally pumped at 976 nm,generating a slope efficiency of 26.9%.Pulses of 8.12 W,148 fs at 2.8μm with a repetition rate of 69.65 MHz are achieved.To the best of our knowledge,this is the highest average power ever achieved from a femtosecond MIR laser source.Such a compact ultrafast laser system is promising for a wide range of applications,such as medical surgery and material processing.展开更多
In this work,we used femtosecond laser double-pulse trains to produce laser-induced periodic surface structures(LIPSS)on 304 stainless steel.Surprisingly,a novel type of periodic structure was discovered,which,to the ...In this work,we used femtosecond laser double-pulse trains to produce laser-induced periodic surface structures(LIPSS)on 304 stainless steel.Surprisingly,a novel type of periodic structure was discovered,which,to the best of our knowledge,is the first in literature.We surmised that the cause for this novel LIPSS was related to the weak energy coupling of subpulses when the intrapulse delay was longer than the thermal relaxation time of stainless steel.Furthermore,we found that the fluence combination and arrival sequence of subpulses in a double-pulse train also influenced LIPSS morphology.展开更多
We report on a mid-infrared fiber laser that uses a single-walled carbon nanotube saturable absorber mirror to realize the mode-locking operation.The laser generates 3.5 μm ultra-short pulses from an erbium-doped flu...We report on a mid-infrared fiber laser that uses a single-walled carbon nanotube saturable absorber mirror to realize the mode-locking operation.The laser generates 3.5 μm ultra-short pulses from an erbium-doped fluoride fiber by utilizing a dual-wavelength pumping scheme.Stable mode-locking is achieved at the 3.5 μm band with a repetition rate of 25.2 MHz.The maximum average power acquired from the laser in the mode-locking regime is 25 mW.The experimental results indicate that the carbon nanotube is an effective saturable absorber for mode-locking in the mid-infrared spectral region.展开更多
High-power tunable femtosecond mid-infrared(MIR)pulses are of great interest for many scientific and industrial applications.Here we demonstrate a compact fluoride-fiber-based system that generates single solitons tun...High-power tunable femtosecond mid-infrared(MIR)pulses are of great interest for many scientific and industrial applications.Here we demonstrate a compact fluoride-fiber-based system that generates single solitons tunable from 3 to 3.8μm.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 3μm.The Dy:ZBLAN fiber amplifier transfers the energy from the residual 2.8μm radiation into the Raman solitons using an in-band pumping scheme,and further extends the wavelength up to 3.8μm.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 at3.8μm with a record average power of 1.6 W and a pulse energy of 23 n J 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.展开更多
基金the National Natural Science Foundation of China(61975136,61935014,62105222,61775146,61905151)the Basic and Applied Basic Research Foundation of Guangdong Province(2019A1515010699)+1 种基金the Shenzhen Science and Technology Innovation Program(CJGJZD20200617103003009,JCYJ20210324094400001,GJHZ20210705141801006)the Beijing Natural Science Foundation(JQ21019).
文摘High-power femtosecond mid-infrared(MIR)lasers are of vast importance to both fundamental research and applications.We report a high-power femtosecond master oscillator power amplifier laser system consisting of a singlemode Er:ZBLAN fiber mode-locked oscillator and pre-amplifier followed by a large-mode-area Er:ZBLAN fiber main amplifier.The main amplifier is actively cooled and bidirectionally pumped at 976 nm,generating a slope efficiency of 26.9%.Pulses of 8.12 W,148 fs at 2.8μm with a repetition rate of 69.65 MHz are achieved.To the best of our knowledge,this is the highest average power ever achieved from a femtosecond MIR laser source.Such a compact ultrafast laser system is promising for a wide range of applications,such as medical surgery and material processing.
基金supported by the National Key R&D Program of China(No.2018YFB1107200)the National Natural Science Foundation of China(Nos.51675048 and 11704028)。
文摘In this work,we used femtosecond laser double-pulse trains to produce laser-induced periodic surface structures(LIPSS)on 304 stainless steel.Surprisingly,a novel type of periodic structure was discovered,which,to the best of our knowledge,is the first in literature.We surmised that the cause for this novel LIPSS was related to the weak energy coupling of subpulses when the intrapulse delay was longer than the thermal relaxation time of stainless steel.Furthermore,we found that the fluence combination and arrival sequence of subpulses in a double-pulse train also influenced LIPSS morphology.
基金supported by the National Natural Science Foundation of China (NSFC) (Nos. 61975136, 61935014, 61775146, and 61905151)Guangdong Basic and Applied Basic Research Foundation (No. 2019A1515010699)+2 种基金Shenzhen Science and Technology Project (Nos. JCYJ20160520161351540, JCYJ20170817100639177,JCYJ20170302151146995, JCYJ20180305125352956,JCYJ20160328144942069,and JCYJ20190808141011530)State Key Laboratory of Information Photonics and Optical Communications (No. IPOC2019ZZ01)State Key Laboratory of Pulsed Power Laser Technology (No. SKL2018KF04)
文摘We report on a mid-infrared fiber laser that uses a single-walled carbon nanotube saturable absorber mirror to realize the mode-locking operation.The laser generates 3.5 μm ultra-short pulses from an erbium-doped fluoride fiber by utilizing a dual-wavelength pumping scheme.Stable mode-locking is achieved at the 3.5 μm band with a repetition rate of 25.2 MHz.The maximum average power acquired from the laser in the mode-locking regime is 25 mW.The experimental results indicate that the carbon nanotube is an effective saturable absorber for mode-locking in the mid-infrared spectral region.
基金Project(GKZY2119502) supported by the Special Funds for Local Scientific and Technological Development guided by the Central Government,ChinaProject(JGY2021001) supported by the Innovation Project of Guangxi Graduate Education,China。
基金National Natural Science Foundation of China(61775146,61905151,61935014,61975136,62105222)Basic and Applied Basic Research Foundation of Guangdong Province(2019A1515010699)+1 种基金Natural Science Basic Research Program of Shaanxi(2020JQ-204)Shenzhen Science and Technology Program(CJGJZD20200617103003009,JCYJ20210324094400001)。
文摘High-power tunable femtosecond mid-infrared(MIR)pulses are of great interest for many scientific and industrial applications.Here we demonstrate a compact fluoride-fiber-based system that generates single solitons tunable from 3 to 3.8μm.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 3μm.The Dy:ZBLAN fiber amplifier transfers the energy from the residual 2.8μm radiation into the Raman solitons using an in-band pumping scheme,and further extends the wavelength up to 3.8μm.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 at3.8μm with a record average power of 1.6 W and a pulse energy of 23 n J 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.
