矩形谱宽带激光中带宽诱导的焦开关现象
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摘要
为了研究频带宽度对激光光束传输和激光应用产生的影响,采用衍射积分推导了矩形谱宽带激光通过双焦色散透镜后的传输公式,利用数值计算研究了矩形谱宽带激光带宽诱导的焦开关现象,分析得到带宽对光强分布和焦开关的影响。结果表明,带宽是影响光强分布和焦开关形成的重要因素;带宽变化会导致光强分布中光强主极大从一个位置跃变到另一个位置,从而形成焦开关现象。该研究结果有助于进一步推动宽频带激光的应用。
In order to research the effects of frequency bandwidth on the propagation and applications of broadband laser,the propagation formula of broadband laser with rectangular spectrum passing through a bifocal dispersion lens system was derived by using diffraction integral. Bandwidth-induced focal switch in broadband laser with rectangular spectrum is studied by numerical calculation. The effects of bandwidth on the intensity distribution and focal switch were analyzed. The results show that bandwidth is an important factor affecting intensity distribution and focal switch. Primary maximum intensity of the focused broadband laser can rapidly bounce from one place to another with the variety of bandwidth and then the focal switch is generated. The results are helpful for further applications of broadband laser.
In order to research the effects of frequency bandwidth on the propagation and applications of broadband laser,the propagation formula of broadband laser with rectangular spectrum passing through a bifocal dispersion lens system was derived by using diffraction integral. Bandwidth-induced focal switch in broadband laser with rectangular spectrum is studied by numerical calculation. The effects of bandwidth on the intensity distribution and focal switch were analyzed. The results show that bandwidth is an important factor affecting intensity distribution and focal switch. Primary maximum intensity of the focused broadband laser can rapidly bounce from one place to another with the variety of bandwidth and then the focal switch is generated. The results are helpful for further applications of broadband laser.
引文
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[16]MU G Q,WANG L,WANG X Q.Focal switch of cosine-squared Gaussian beams passing through an astigmatic lens[J].Laser Technology,2011,35(4):562-565(in Chinese).
[17]MALITSON I H.Interspecimen comparison of the refractive index of fused silica[J].Journal of the Optical Society of America,1965,55(10):1205-1208.
[18]PENG R W,LI L,LI Y J,et al.Positive and negative focal shifts of an apertured supercontinuum laser with rectangular spectrum[J].Optics Communications,2013,298/299:34-36.
[2]ALFANO R R,SHAPIRO S L.Direct distortion of electronic clouds of rare-gas atoms in intense electric fields[J].Physics Review Letters,1970,24(22):1217-1220.
[3]JONES D J,DIDDAMS S A,RANKA J K,et al.Carrier-envelope phase control of femtosecond mode-locked lasers and direct optical frequency synthesis[J].Science,2000,288(5466):635-639.
[4]HSIUNG P,CHEN Y,KO T H,et al.Optical coherence tomography using a continuous-wave,high-power,Raman continuum light source[J].Optics Express,2004,12(22):5287-5295.
[5]MORIOKA T,MORI K,SARUWATARI M.More than 100-wavelength-channel picosecond optical pulse generation from single laser source using supercontinuum in optical fibers[J].Electronics Letters,1993,29(10):862-864.
[6]LI A P,ZHENG Y,ZHANG X F,et al.The supercontinuum generation in a photonic crystal fiber pumped at the anomalous dispersion region[J].Laser Technology,2008,32(1):50-52(in Chinese).
[7]AMENT C,POLYNKIN P,JEROME V M.Supercontinuum generation with femtosecond self-healing airy pulses[J].Physics Review Letters,2011,107(24):243901.
[8]REID D T.Ultra-broadband pulse evolution in optical parametric oscillators[J].Optics Express,2011,19(19):17979-17984.
[9]CONFORTI M,BARONIO F,ANGELIS C D.Nonlinear envelope equation for broadband optical pulses in quadratic media[J].Physical Review,2010,A81(5):053841.
[10]PENG R W,LI L,LI Y J,et al.Intensity distribution of broadband laser with flattened-Gaussian mode passing through an aperture[J].Laser Technology,2013,37(6):829-832(in Chinese)
[11]YUAN N,ZHANG W,WANG J,et al.Intensity distributions of a supercontinuum laser in an apertured dispersion lens[J].Chinese Physics Letters,2015,32(3):034201.
[12]MARTINEZ M,CLIMENT V.Focal switch:a new effect in low-Fresnel-number systems[J].Applied Optics,1996,35(1):24-27.
[13]JI X L,LB D.Focal shift and focal switch of flattened Gaussian beams in passage through an aperture bifocal lens[J].IEEE Journal of Quantum Electronics,2003,39(1):172-178.
[14]DU X,ZHAO D.Focal shift and focal switch of focused truncated elliptical Gaussian beams[J].Optics Communications,2007,275(2):301-304.
[15]LIU W B,ZHONG M,HE H X,et al.Focal shift and focal switch of partially coherent annular beam focused by lens[J].Laser Technology,2008,32(3):259-261(in Chinese).
[16]MU G Q,WANG L,WANG X Q.Focal switch of cosine-squared Gaussian beams passing through an astigmatic lens[J].Laser Technology,2011,35(4):562-565(in Chinese).
[17]MALITSON I H.Interspecimen comparison of the refractive index of fused silica[J].Journal of the Optical Society of America,1965,55(10):1205-1208.
[18]PENG R W,LI L,LI Y J,et al.Positive and negative focal shifts of an apertured supercontinuum laser with rectangular spectrum[J].Optics Communications,2013,298/299:34-36.