高相干度中红外超连续谱光源的研究
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摘要
选用全波段正常色散As_2S_3光子晶体光纤作为非线性介质来消除反常色散区中孤子分裂引起的调制不稳定性所造成的超连续谱相干特性的恶化问题.利用分步傅里叶法数值模拟超短激光脉冲在全波段正常色散As_2S_3光子晶体光纤中的非线性传输和中红外超连续谱的产生.分析脉宽、传输距离、入射峰值功率和初始啁啾对中红外超连续谱光源的带宽、相干特性和平坦度的影响.通过优化泵浦激光参数和光纤参量,在最佳负啁啾C_p=-4、脉宽为50 fs、中心波长为2 800 nm、入射峰值功率为100 W和光纤长度为20 cm时,获得3 dB带宽高达2 484 nm的中红外超连续谱,且具有良好相干度和平坦度.
An all-normal dispersion As_2S_3 photonic crystal fiber is selected as the nonlinear media toeliminate the degradation of coherence characteristics of supercontinuum in the anomalous dispersion regionwhich is caused by the modulation instability induced by the fission of higher-order soliton.The nonlinearpropagation of an ultrashort pulse and mid-infrared supercontinuum generation in an all-normal dispersion As_2S_3 photonic crystal fiber were simulated with the standard split-step Fourier algorithm.The impact of pulsewidth,propagation distance,input peak power,initial frequency chirp on the bandwidth,coherence propertiesand flatness of supercontinuum was simulated and analyzed.By optimizing the parameters of the pump pulseand parameters of the fiber,a highly coherent and flat supercontinuum with 3 dB bandwidth of 2 484 nm isobtained when the optimal chip is -4,pulse width is 50 fs,pump wavelength is 2 800 nm,input peak poweris 100 W and fiber length is 20 cm.
An all-normal dispersion As_2S_3 photonic crystal fiber is selected as the nonlinear media toeliminate the degradation of coherence characteristics of supercontinuum in the anomalous dispersion regionwhich is caused by the modulation instability induced by the fission of higher-order soliton.The nonlinearpropagation of an ultrashort pulse and mid-infrared supercontinuum generation in an all-normal dispersion As_2S_3 photonic crystal fiber were simulated with the standard split-step Fourier algorithm.The impact of pulsewidth,propagation distance,input peak power,initial frequency chirp on the bandwidth,coherence propertiesand flatness of supercontinuum was simulated and analyzed.By optimizing the parameters of the pump pulseand parameters of the fiber,a highly coherent and flat supercontinuum with 3 dB bandwidth of 2 484 nm isobtained when the optimal chip is -4,pulse width is 50 fs,pump wavelength is 2 800 nm,input peak poweris 100 W and fiber length is 20 cm.
引文
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[22]Hu P D,Niu Y P,Wang X X,et al.Generation of attosecond pulse pair in polar media by chirped few-cycle pulses[J].J Opt,2016(18):095504-1-10.
[23]Zhang C,Liu C P.Chirp-dependent spectral distribution for few-cycle pulses propagating through nano-semiconductordevices[J].Phys Lett A,2016,380(40):3233-3237.
[2]Petersen C R,M?ller U,Kubat I,et al.Mid-infrared supercontinuum covering the 14 133μm molecular fingerprintregion using ultra-high NA chalcogenide step-index fibre[J].Nat Photonics,2014,8(11):830-834.
[3]Brilland L,Smektala F,Renversez G,et al.Fabrication of complex structures of holey fibers in chalcogenide glass[J].OptExpress,2006,14(3):1280-1285.
[4]Liao M,Chaudhari C,Qin G,et al.Fabrication and characterization of a chalcogenide-tellurite composite microstructurefiber with high nonlinearity[J].Opt Express,2009,17(24):21608-21614.
[5]El-Amraoui M,Fatome J,Jules J C,et al.Strong infrared spectral broadening in low-loss As-S chalcogenide suspended coremicrostructured optical fibers[J].Opt Express,2010,18(5):4547-4556.
[6]Weiblen A D R J,Hu J,Menyuk C R.Calculation of the expected bandwidth for a mid-infrared supercontinuum sourcebased on As2S3Chalcogenide photonic crystal fibers[J].Opt Express,2010,18(25):26666-26674.
[7]Gattass R R,Shaw L B,Nguyen V Q,et al.All-fiber chalcogenide-based Mid-infrared supercontinuum source[J].OptFiber Technol,2012,18(5):345-348.
[8]Sanghera J S,Aggarwal I D,Busse L E,et al.Chalcogenide optical fibers target Mid-IR applications[J].Laser FocusWorld,2005,41(4):83-87.
[9]Domachuk P,Wolchover N A,Cronin-Golomb M,et al.Over 4 000 nm bandwidth of mid-IR supercontinuum generation insub-centimeter segments of highly nonlinear tellurite PCFs[J].Opt Express,2008,16(10):7161-7168.
[10]Snopatin G E,Churbanov M F,Pushkin A A,et al.High purity arsenic-sulfide glasses and fibers with minimumattenuation of 12 dB/km[J].Optoelectron Adv Mate Rapid Commun 2009,3(7):669-671.
[11]El-Amraoui M,Gadret G,Jules J C,et al.Microstructured chalcogenide optical fibers from As2S3glass:towards new IRbroadband sources[J].Opt Express,2010,18(25):26655-26665.
[12]Savelii I,Mouawad O,Fatome J,et al.Mid-infrared 2 000 nm bandwidth supercontinuum generation in suspended-coremicrostructured Sulfide and Tellurite optical fibers[J].Opt Express,2012,20(24):27083-27093.
[13]Gao W,Amraoui M E,Liao M,et al.Mid-infrared supercontinuum generation in a suspended-core As2S3chalcogenidemicrostructured optical fiber[J].Opt Express,2013,21(8):9573-9583.
[14]Maji P S,Chaudhuri P R.Design of all-normal dispersion based on multi-material photonic crystal fiber in IR region forbroadband supercontinuum generation[J].Appl Opt,2015,54(13):4042-4048.
[15]Colley C S,Hebden J C,Delpy D T,et al.Mid-infrared optical coherence tomography[J].Rev Sci Instrum,2007,78(12):123108-1-7.
[16]Schliesser A,PicquéN,H?nsch T W.Mid-infrared frequency combs[J].Nat Photonics,2012,6(7):440-449.
[17]Demircan A,Bandelow U.Analysis of the interplay between soliton fission and modulation instability in supercontinuumgeneration[J].Appl Phys B,2007,86(1):31-39.
[18]Dudley J M,Genty G,Coen S.Supercontinuum generation in photonic crystal fiber[J].Rev Mod Phys,2006,78(4):1135-1184.
[19]Foster M A,Gaeta A L,Cao Q,et al.Soliton-effect compression of supercontinuum to few-cycle durations in photonicnanowires[J].Opt Express,2005,13(18):6848-6855.
[20]Heidt A M.Pulse preserving flat-top supercontinuum generation in all-normal dispersion photonic crystal fibers[J].J OptSoc Am B,2010(27):550-559.
[21]Zhu Z,Brown T G.Effect of frequency chirping on supercontinuum generation in photonic crystal fibers[J].Opt Express,2004,12(4):689-694.
[22]Hu P D,Niu Y P,Wang X X,et al.Generation of attosecond pulse pair in polar media by chirped few-cycle pulses[J].J Opt,2016(18):095504-1-10.
[23]Zhang C,Liu C P.Chirp-dependent spectral distribution for few-cycle pulses propagating through nano-semiconductordevices[J].Phys Lett A,2016,380(40):3233-3237.