By using a photonic crystal fiber, a supercontinuum source with output power up to 1.7W, pumped by a passively mode-locked diode-pumped Nd：YVO4 picosecond laser is obtained. A spectral width of the supercontinuum is ...By using a photonic crystal fiber, a supercontinuum source with output power up to 1.7W, pumped by a passively mode-locked diode-pumped Nd：YVO4 picosecond laser is obtained. A spectral width of the supercontinuum is 1700 nm （500–2200 nm） with the 5 dB spectral width approximately 1000 nm （1200–2200 nm）. This high power wide band supercontinuum source meets the demand of many applications such as optical coherence tomography, frequency metrology and wavelength-division-multiplexing systems. The evolution of the supercontinuum with the increasing pump power is presented and analyzed.展开更多
Cylindrical vector beams(CVBs),with non-uniform state of polarizations,have become an indispensable tool in many areas of science and technology.However,little research has explored high power CVBs at the femtosecond ...Cylindrical vector beams(CVBs),with non-uniform state of polarizations,have become an indispensable tool in many areas of science and technology.However,little research has explored high power CVBs at the femtosecond regime.In this paper,we report on tne generation of high quality CVBs with high peak power and femtosecond pulse duration in a fiber chirped-pulse amplification laser system.The radially(azimuthally)polarized vector beam has been obtained with a pulse duration of 4A0 fs[430 fs]and a maximum average output power of 20.36 W[20.12 W].The maximum output pulse energy is〜20μJ at a repetition rate of 1 MHz,corresponding to a high peak power of-46 MW.The comparison between simulated intensity profiles and measured experimental results suggests that the generated CVBs have a remarkable intensity distribution.The proposed configuration of our laser system provides a promising solution for high quality CVBs generation with the characteristics of high peak power,ultrashort pulse duration,and high mode purity.展开更多
A novel web-like microstructure optical fiber （MOF） submicron-thickness membranes as planar waveguides is fabricated which serves as a bundle of suspended and their Y-type connection nodes as the secondary cores. Th...A novel web-like microstructure optical fiber （MOF） submicron-thickness membranes as planar waveguides is fabricated which serves as a bundle of suspended and their Y-type connection nodes as the secondary cores. The polarization dependent visible continuum coverage from 350 to 1 000 nm is generated from a 20-cm-long membrane of 0.55-μm-thickness pumped by 200-fs laser at 800 nm. We also obtain narrowband signal of blue dispersive wave around 410 nm with the up-conversion efficiency routinely beyond 20% inthe Y-type secondary core in another smaller web-like MOF.展开更多
A novel large-mode-area Bragg fiber （BF） is proposed for selectively suppressing the amplified spontaneous emission （ASE） of Yb. Confinement loss can be effectively lowered by adding a layer of F-doped glass near ...A novel large-mode-area Bragg fiber （BF） is proposed for selectively suppressing the amplified spontaneous emission （ASE） of Yb. Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber. The BF can achieve effective suppression of ASE of Yb when the bend radius is 0.15 m at wavelength lower than 1.13 μm in theory, and eliminate LP 11 mode in mode competition in wavelength range of 1.15 1.2 μm.展开更多
We demonstrate an erbium-doped ring-cavity fiber laser Q-switched by a graphene oxide-based saturable absorber(GOSA).The GOSA was fabricated by vertically evaporating GO-polyvinylalcohol(GO/PVA)composite dispersion,an...We demonstrate an erbium-doped ring-cavity fiber laser Q-switched by a graphene oxide-based saturable absorber(GOSA).The GOSA was fabricated by vertically evaporating GO-polyvinylalcohol(GO/PVA)composite dispersion,and has a good performance under room temperature.Utilizing a specially fabricated fiber Bragg grating(FBG),stable five-wavelength lasing is realized and stabilized at different pump powers under any polarization.When the pump power increases from 78.4 mW to 379.3 mW,the output power ranging from 1.9 mW to 16.6 mW could be obtained,with pulse duration from 6.8μs to 2.72μs,single pulse energy from 123.73 nJ to 229.74 nJ,and pulse repetition rate from 15.36 kHz to 72.25 kHz.To the best of our knowledge,it is the first simultaneous realization of five-wavelength operation and pulse output in a GO Q-switched all fiber laser system.展开更多
A seven-core photonic crystal fiber （PCF） is fabricated and shown to possess a Gaussian-like far-field-intensity distribution. The seven-core PCF, designed with double-cladding structure and zero dispersion waveleng...A seven-core photonic crystal fiber （PCF） is fabricated and shown to possess a Gaussian-like far-field-intensity distribution. The seven-core PCF, designed with double-cladding structure and zero dispersion wavelength at 927nm, is utilized to build up a 104 W all-fiber-integrated supercontinuum （SC） source with total conversion efficiency up to 74.3%. The average output power of SC can be further sealed based on this multi-core PCF.展开更多
文摘By using a photonic crystal fiber, a supercontinuum source with output power up to 1.7W, pumped by a passively mode-locked diode-pumped Nd：YVO4 picosecond laser is obtained. A spectral width of the supercontinuum is 1700 nm （500–2200 nm） with the 5 dB spectral width approximately 1000 nm （1200–2200 nm）. This high power wide band supercontinuum source meets the demand of many applications such as optical coherence tomography, frequency metrology and wavelength-division-multiplexing systems. The evolution of the supercontinuum with the increasing pump power is presented and analyzed.
基金This work was supported by the National Natural Science Foundation of China(NSFC)(Nos.61905148,61805278,and 61775146)Equipment Pre-research Field Foundation(No.61404140304)+1 种基金China Postdoctoral Science Foundation(No.2018M633704)State Key Laboratory of Advanced Optical Communication Systems and Networks.
文摘Cylindrical vector beams(CVBs),with non-uniform state of polarizations,have become an indispensable tool in many areas of science and technology.However,little research has explored high power CVBs at the femtosecond regime.In this paper,we report on tne generation of high quality CVBs with high peak power and femtosecond pulse duration in a fiber chirped-pulse amplification laser system.The radially(azimuthally)polarized vector beam has been obtained with a pulse duration of 4A0 fs[430 fs]and a maximum average output power of 20.36 W[20.12 W].The maximum output pulse energy is〜20μJ at a repetition rate of 1 MHz,corresponding to a high peak power of-46 MW.The comparison between simulated intensity profiles and measured experimental results suggests that the generated CVBs have a remarkable intensity distribution.The proposed configuration of our laser system provides a promising solution for high quality CVBs generation with the characteristics of high peak power,ultrashort pulse duration,and high mode purity.
文摘A novel web-like microstructure optical fiber （MOF） submicron-thickness membranes as planar waveguides is fabricated which serves as a bundle of suspended and their Y-type connection nodes as the secondary cores. The polarization dependent visible continuum coverage from 350 to 1 000 nm is generated from a 20-cm-long membrane of 0.55-μm-thickness pumped by 200-fs laser at 800 nm. We also obtain narrowband signal of blue dispersive wave around 410 nm with the up-conversion efficiency routinely beyond 20% inthe Y-type secondary core in another smaller web-like MOF.
基金supported by the National Natural Science Foundation of China (Nos. 61007054 and 10904173)the Natural Science Foundation of Guangdong Province(No. 9451806001002428)the Science Technology Program of Shenzhen City (No. 200718)
文摘A novel large-mode-area Bragg fiber （BF） is proposed for selectively suppressing the amplified spontaneous emission （ASE） of Yb. Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber. The BF can achieve effective suppression of ASE of Yb when the bend radius is 0.15 m at wavelength lower than 1.13 μm in theory, and eliminate LP 11 mode in mode competition in wavelength range of 1.15 1.2 μm.
基金Supported by the National Key Basic Research and Development Program of China(No 2010CB735904)NSFC(No 61007054)+5 种基金Doctoral Program of High School Research Fund(No 20104408110002)the Improvement and Development Project of Shenzhen Key Lab(No CXB201005240014A)the Science and Technology Project of Shenzhen City(No JC201105170693A)the Key Program of Basic Research Project of Shenzhen(No JC201005250048A)the Applied Technology Developmental Project of Shenzhen University(No 201221)the Research Grants Council of Hong Kong,China(No GRF PolyU 526511).
文摘We demonstrate an erbium-doped ring-cavity fiber laser Q-switched by a graphene oxide-based saturable absorber(GOSA).The GOSA was fabricated by vertically evaporating GO-polyvinylalcohol(GO/PVA)composite dispersion,and has a good performance under room temperature.Utilizing a specially fabricated fiber Bragg grating(FBG),stable five-wavelength lasing is realized and stabilized at different pump powers under any polarization.When the pump power increases from 78.4 mW to 379.3 mW,the output power ranging from 1.9 mW to 16.6 mW could be obtained,with pulse duration from 6.8μs to 2.72μs,single pulse energy from 123.73 nJ to 229.74 nJ,and pulse repetition rate from 15.36 kHz to 72.25 kHz.To the best of our knowledge,it is the first simultaneous realization of five-wavelength operation and pulse output in a GO Q-switched all fiber laser system.
基金Supported by the National High-Technology Research and Development Program of China under Grant No 2013AA031501the National Natural Science Foundation of China under Grant Nos 61575075,61535009 and 61275144
文摘A seven-core photonic crystal fiber （PCF） is fabricated and shown to possess a Gaussian-like far-field-intensity distribution. The seven-core PCF, designed with double-cladding structure and zero dispersion wavelength at 927nm, is utilized to build up a 104 W all-fiber-integrated supercontinuum （SC） source with total conversion efficiency up to 74.3%. The average output power of SC can be further sealed based on this multi-core PCF.
