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Optimization of multi-color laser waveform for high-order harmonic generation |
Cheng Jin(金成)1, C D Lin(林启东)2 |
1. Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China; 2. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan 66506, USA |
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Abstract With the development of laser technologies, multi-color light-field synthesis with complete amplitude and phase control would make it possible to generate arbitrary optical waveforms. A practical optimization algorithm is needed to generate such a waveform in order to control strong-field processes. We review some recent theoretical works of the optimization of amplitudes and phases of multi-color lasers to modify the single-atom high-order harmonic generation based on genetic algorithm. By choosing different fitness criteria, we demonstrate that: (i) harmonic yields can be enhanced by 10 to 100 times, (ii) harmonic cutoff energy can be substantially extended, (iii) specific harmonic orders can be selectively enhanced, and (iv) single attosecond pulses can be efficiently generated. The possibility of optimizing macroscopic conditions for the improved phase matching and low divergence of high harmonics is also discussed. The waveform control and optimization are expected to be new drivers for the next wave of breakthrough in the strong-field physics in the coming years.
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Received: 03 April 2016
Revised: 29 April 2016
Accepted manuscript online:
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PACS:
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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31.70.Hq
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(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
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32.90.+a
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(Other topics in atomic properties and interactions of atoms with photons)
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Fund: Project supported by the Fundamental Research Funds for the Central Universities of China (Grant No. 30916011207), Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U. S. Department of Energy (Grant No. DE-FG02-86ER13491), and Air Force Office of Scientific Research, USA (Grant No. FA9550-14-1-0255). |
Corresponding Authors:
Cheng Jin
E-mail: cjin@njust.edu.cn
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Cite this article:
Cheng Jin(金成), C D Lin(林启东) Optimization of multi-color laser waveform for high-order harmonic generation 2016 Chin. Phys. B 25 094213
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[1] |
Corkum P B and Krausz F 2007 Nat. Phys. 3 381
|
[2] |
Agostini P and DiMauro L F 2004 Rep. Prog. Phys. 67 813
|
[3] |
Chang Z, Rundquist A, Wang H, Murnane M M and Kapteyn H C 1997 Phys. Rev. Lett. 79 2967
|
[4] |
Goulielmakis E, Schultze M, Hofstetter M, Yakovlev V S, Gagnon J, Uiberacker M, Aquila A L, Gullikson E M, Attwood D T, Kienberger R, Krausz F and Kleineberg U 2008 Science 320 1614
|
[5] |
Zhao K, Zhang Q, Chini M, Wu Y, Wang X and Chang Z 2012 Opt. Lett. 37 3891
|
[6] |
López-Martens R, Varjú K, Johnsson P, Mauritsson J, Mairesse Y, Saliéres P, Gaarde M B, Schafer K J, Persson A, Svanberg S, Wahlström C G and L'Huillier A 2005 Phys. Rev. Lett. 94 033001
|
[7] |
Krausz F and Ivanov M 2009 Rev. Mod. Phys. 81 163
|
[8] |
Itatani J, Levesque J, Zeidler D, Niikura H, Pépin H, Kieffer J C, Corkum P B and Villeneuve D M 2004 Nature 432 867
|
[9] |
Haessler S, Caillat J, Boutu W, Giovanetti-Teixeira C, Ruchon T, Auguste T, Diveki Z, Breger P, Maquet A, Carré B, Taïeb R and Saliéres P 2010 Nat. Phys. 6 200
|
[10] |
Vozzi C, Negro M, Calegari F, Sansone G, Nisoli M, De Silvestri S and Stagira S 2011 Nat. Phys. 7 822
|
[11] |
Shiner A D, Schmidt B E, Trallero-Herrero C, Wörner H J, Patchkovskii S, Corkum P B , Kieffer J C, Légaré F and Villeneuve D M 2011 Nat. Phys. 7 464
|
[12] |
Smirnova O, Mairesse Y, Patchkovskii S, Dudovich N, Villeneuve D, Corkum P and Ivanov M Y 2009 Nature 460 972
|
[13] |
Wörner H J, Bertrand J B, Kartashov D V, Corkum P B and Villeneuve D M 2010 Nature 466 604
|
[14] |
Gaarde M B, Tate J L and Schafer K J 2008 J. Phys. B-At. Mol. Opt. Phys. 41 132001
|
[15] |
Jin C, Le A T and Lin C D 2011 Phys. Rev. A 83 023411
|
[16] |
Jin C 2013 Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium (Springer) pp. 34-41
|
[17] |
Takahashi E, Tosa V, Nabekawa Y and Midorikawa K 2003 Phys. Rev. A 68 023808
|
[18] |
Geissler M, Tempea G, Scrinzi A, Schnürer M, Krausz F and Brabec T 1999 Phys. Rev. Lett. 83 2930
|
[19] |
Rae S C and Burnett K 1992 Phys. Rev. A 46 1084
|
[20] |
Priori E, Cerullo G, Nisoli M, Stagira S, De Silvestri S, Villoresi P, Poletto L, Ceccherini P, Altucci C, Bruzzese R and de Lisio C 2000 Phys. Rev. A 61 063801
|
[21] |
Corkum P B 1993 Phys. Rev. Lett. 71 1994
|
[22] |
Krause J L, Schafer K J and Kulander K C 1992 Phys. Rev. Lett. 68 3535
|
[23] |
Hong K H, Lai C J, Siqueira J, Krogen P, Moses J, Chang C L, Stein G J, Zapata L E and Kärtner F X 2014 Opt. Lett. 39 3145
|
[24] |
Sanchez D, Hemmer M, Baudisch M, Cousin S L, Zawilski K, Schunemann P, Chalus O, Simon-Boisson C and Biegert J 2016 Optica 3 147
|
[25] |
Popmintchev T, Chen M C, Popmintchev D, Arpin P, Brown S, Ališauskas S, Andriukaitis G, Balčiunas T, Mücke O D, Pugzlys A, Baltuška A, Shim B, Schrauth S E, Gaeta A, Hernández-García C, Plaja L, Becker A, Jaron-Becker A, Murnane M M and Kapteyn H C 2012 Science 336 1287
|
[26] |
Chini M, Wang X, Cheng Y, Wang H, Wu Y, Cunningham E, Li P C, Heslar J, Telnov D A, Chu S I and Chang Z 2014 Nat. Photonics 8 437
|
[27] |
Pupeza I, Holzberger S, Eidam T, Carstens H, Esser D, Weitenberg J, Rußbüldt P, Rauschenberger J, Limpert J, Udem T, Tünnermann A, Hänsch T W, Apolonski A, Krausz F and Fill E 2013 Nat. Photonics 7 608
|
[28] |
Dubrouil A, Hort O, Catoire F, Descamps D, Petit S, Mével E, Strelkov V V and Constant E 2014 Nat. Commun. 5 4637
|
[29] |
Wang L F, He X K, Teng H, Yun C X, Zhang W and Wei Z Y 2014 Acta Phys. Sin. 63 224103 (in Chinese)
|
[30] |
Constant E, Garzella D, Breger P, Mével E, Dorrer C, Le Blanc C, Salin F and Agostini P 1999 Phys. Rev. Lett. 82 1668
|
[31] |
Kazamias S, Douillet D, Weihe F, Valentin C, Rousse A, Sebban S, Grillon G, Augé F, Hulin D and Balcou P 2003 Phys. Rev. Lett. 90 193901
|
[32] |
Yakovlev V S, Ivanov M and Krausz F 2007 Opt. Express 15 15351
|
[33] |
Watanabe S, Kondo K, Nabekawa Y, Sagisaka A and Kobayashi Y 1994 Phys. Rev. Lett. 73 2692
|
[34] |
Kim I J, Kim C M, Kim H T, Lee G H, Lee Y S, Park J Y, Cho D J and Nam C H 2005 Phys. Rev. Lett. 94 243901
|
[35] |
Brizuela F, Heyl C M, Rudawski P, Kroon D, Rading L, Dahlström J M, Mauritsson J, Johnsson P, Arnold C L and L'Huillier A 2013 Sci. Rep. 3 1410
|
[36] |
Protopapas M, Sanpera A, Knight P L and Burnett K 1995 Phys. Rev. A 52 R2527
|
[37] |
Schiessl K, Persson E, Scrinzi A and Burgdörfer J 2006 Phys. Rev. A 74 053412
|
[38] |
Kondo K, Kobayashi Y, Sagisaka A, Nabekawa Y and Watanabe S 1996 J. Opt. Soc. Am. B 13 424
|
[39] |
Pi L W, Shi T Y and Qiao H X 2006 Chin. Phys. Lett. 23 1490
|
[40] |
Zhai Z, Yu R F, Liu X S and Yang Y J 2008 Phys. Rev. A 78 041402
|
[41] |
Zhang G T, Wu J, Xia C L and Liu X S 2009 Phys. Rev. A 80 055404
|
[42] |
Li F, Wang G L, Zhao S F and Zhou X X 2015 Chin. Phys. Lett. 32 014210
|
[43] |
Kohler M C and Hatsagortsyan K Z 2012 Phys. Rev. A 85 023819
|
[44] |
Gaarde M B, Schafer K J, Heinrich A, Biegert J and Keller U 2005 Phys. Rev. A 72 013411
|
[45] |
Lan P, Takahashi E J and Midorikawa K 2010 Phys. Rev. A 81 061802
|
[46] |
Shiner A D, Trallero-Herrero C, Kajumba N, Bandulet H C, Comtois D, Légaré F, Giguére M, Kieffer J C, Corkum P B and Villeneuve D M 2009 Phys. Rev. Lett. 103 073902
|
[47] |
Tate J, Auguste T, Muller H G, Saliéres P, Agostini P and DiMauro L F 2007 Phys. Rev. Lett. 98 013901
|
[48] |
Schiessl K, Ishikawa K L, Persson E and Burgdörfer J 2007 Phys. Rev. Lett. 99 253903
|
[49] |
Frolov M V, Manakov N L and Starace A F 2008 Phys. Rev. Lett. 100 173001
|
[50] |
Le A T, Wei H, Jin C, Tuoc V N, Morishita T and Lin C D 2014 Phys. Rev. Lett. 113 033001
|
[51] |
Ishikawa K 2003 Phys. Rev. Lett. 91 043002
|
[52] |
Ivanov I A and Kheifets A S 2009 Phys. Rev. A 80 023809
|
[53] |
Wang B, Li X and Fu P 2000 Phys. Rev. A 62 063816
|
[54] |
Wu J, Zhang G T, Xia C L and Liu X S 2010 Phys. Rev. A 82 013411
|
[55] |
Xu J, Zeng B and Yu Y 2010 Phys. Rev. A 82 053822
|
[56] |
Zhao D and Li F L 2013 Chin. Phys. B 22 064215
|
[57] |
Pfeife T, Gallmann L, Abel M J, Nagel P M, Neumark D M and Leone S R 2006 Phys. Rev. Lett. 97 163901
|
[58] |
Kim C M and Nam C H 2006 J. Phys. B-At. Mol. Opt. Phys. 39 3199
|
[59] |
Kim B, Ahn J, Yu Y, Cheng Y, Xu Z and Kim D E 2008 Opt. Express 16 10331
|
[60] |
Tosa V, Altucci C, Kovács K, Negro M, Stagira S, Vozzi C and Velotta R 2012 IEEE J. Sel. Top. Quant. 18 239
|
[61] |
Xia C L and Miao X Y 2015 Chin. Phys. Lett. 32 043202
|
[62] |
Zeng Z, Cheng Y, Song X, Li R and Xu Z 2007 Phys. Rev. Lett. 98 203901
|
[63] |
Li P C, Liu I L and Chu S I 2011 Opt. Express 19 23857
|
[64] |
Du H, Wang H and Hu B 2010 Phys. Rev. A 81 063813
|
[65] |
Du H and Hu B 2011 Phys. Rev. A 84 023817
|
[66] |
Hong W, Lu P, Li Q and Zhang Q 2009 Opt. Lett. 34 2102
|
[67] |
Lan P, Takahashi E J and Midorikawa K 2010 Phys. Rev. A 82 053413
|
[68] |
Zhang X, Li Q, Yi X, Lv H and Ding Y 2013 Opt. Commun. 291 285
|
[69] |
Zhang Q, He L, Lan P and Lu P 2014 Opt. Express 22 13213
|
[70] |
Song X, Zeng Z, Fu Y, Cai B, Li R, Cheng Y and Xu Z 2007 Phys. Rev. A 76 043830
|
[71] |
Zou P, Zeng Z, Zheng Y, Lu Y, Liu P, Li R and Xu Z 2010 Phys. Rev. A 81 033428
|
[72] |
Feng L and Chu T 2011 Phys. Rev. A 84 053853
|
[73] |
Lu R F, He H X, Guo Y H and Han K L 2009 J. Phys. B-At. Mol. Opt. Phys. 42 225601
|
[74] |
Yu C, Wang Y, Cao X, Jiang S and Lu R 2014 J. Phys. B-At. Mol. Opt. Phys. 47 225602
|
[75] |
Zhang C and Liu C 2015 New J. Phys. 17 023026
|
[76] |
Zhao S F, Zhou X X, Li P C and Chen Z 2008 Phys. Rev. A 78 063404
|
[77] |
Li P C, Zhou X X, Wang G L and Zhao Z X 2009 Phys. Rev. A 80 053825
|
[78] |
Lan P, Lu P, Cao W and Wang X 2007 Phys. Rev. A 76 043808
|
[79] |
Vozzi C, Calegari F, Frassetto F, Poletto L, Sansone G, Villoresi P, Nisoli M, De Silvestri S and Stagira S 2009 Phys. Rev. A 79 033842
|
[80] |
Bandulet H C, Comtois D, Bisson E, Fleischer A, Pépin H, Kieffer J C, Corkum P B and Villeneuve D M 2010 Phys. Rev. A 81 013803
|
[81] |
Siegel T, Torres R, Hoffmann D J, Brugnera L, Procino I, Zaïr A, Underwood J G, Springate E, Turcu I C E, Chipperfield L E and Marangos J P 2010 Opt. Express 18 6853
|
[82] |
Oishi Y, Kaku M, Suda A, Kannari F and Midorikawa K 2006 Opt. Express 14 7230
|
[83] |
Takahashi E J, Lan P, Mücke O D, Nabekawa Y and Midorikawa K 2010 Phys. Rev. Lett. 104 233901
|
[84] |
Huang S W, Cirmi G, Moses J, Hong K H, Bhardwaj S, Birge J R, Chen L J, Li E, Eggleton B J, Cerullo G and Kärtner F X 2011 Nat. Photonics 5 475
|
[85] |
Wirth A, Hassan M T, Grguraš I, Gagnon J, Moulet A, Luu T T, Pabst S, Santra R, Alahmed Z A, Azzeer A M, Yakovlev V S, Pervak V, Krausz F and Goulielmakis E 2011 Science 334 195
|
[86] |
Takahashi E J, Lan P, Mücke O D, Nabekawa Y and Midorikawa K 2013 Nat. Commun. 4 2691
|
[87] |
Haessler S, Balčiunas T, Fan G, Andriukaitis G, Pugžlys A, Baltuška A, Witting T, Squibb R, Zaïr A, Tisch J W G, Marangos J P and Chipperfield L E 2014 Phys. Rev. X 4 021028
|
[88] |
Ishii N, Kosuge A, Hayashi T, Kanai T, Itatani J, Adachi S and Watanabe S 2008 Opt. Express 16 20876
|
[89] |
Dao L V, Dinh K B and Hannaford P 2015 Nat. Commun. 6 7175
|
[90] |
Wei P, Miao J, Zeng Z, Li C, Ge X, Li R and Xu Z 2013 Phys. Rev. Lett. 110 233903
|
[91] |
Wei P, Zeng Z, Jiang J, Miao J, Zheng Y, Ge X, Li C and Li R 2014 Appl. Phys. Lett. 104 151101
|
[92] |
Schütt B, Weber P, Kovács K, Balogh E, Major B, Tosa V, Han S, Vrakking M J J, Varjú K and Rouzée A 2015 Opt. Express 23 33947
|
[93] |
Manzoni C, Mücke O D, Cirmi G, Fang S, Moses J, Huang S W, Hong K H, Cerullo G and Kärtner F X 2015 Laser Photonics Rev. 9 129
|
[94] |
Mücke O D, Fang S, Cirmi G, Rossi G M, Chia S H, Ye H, Yang Y, Mainz R, Manzoni C, Farinello P, Cerullo G and Kärtner F X 2015 IEEE J. Sel. Top. Quant. 22 1
|
[95] |
Chipperfield L E, Robinson J S, Tisch J W G and Marangos J P 2009 Phys. Rev. Lett. 102 063003
|
[96] |
Balogh E, Bódi B, Tosa V, Goulielmakis E, Varjú K and Dombi P 2014 Phys. Rev. A 90 023855
|
[97] |
Jin C,Wang G,Wei H, Le A T and Lin C D 2014 Nat. Commun. 5 4003
|
[98] |
Jin C, Wang G, Le A T and Lin C D 2014 Sci. Rep. 4 7067
|
[99] |
Wang X, Jin C and Lin C D 2014 Phys. Rev. A 90 023416
|
[100] |
Jin C, Hong K H and Lin C D 2015 Opt. Lett. 40 3754
|
[101] |
Chou Y, Li P C, Ho T S and Chu S I 2015 Phys. Rev. A 91 063408
|
[102] |
Solanpää J, Budagosky J A, Shvetsov-Shilovski N I, Castro A, Rubio A and Räsänen E 2014 Phys. Rev. A 90 053402
|
[103] |
Ben Haj Yedder A, Le Bris C, Atabek O, Chelkowski S and Bandrauk A D 2004 Phys. Rev. A 69 041802
|
[104] |
Hellgren M, Räsänen E and Gross E K U 2013 Phys. Rev. A 88 013414
|
[105] |
Schaefer I and Kosloff R 2012 Phys. Rev. A 86 063417
|
[106] |
Roos L, Gaarde M B and L'Huillier A 2001 J. Phys. B-At. Mol. Opt. Phys. 34 5041
|
[107] |
Lewenstein M, Balcou P, Ivanov M Y, L'Huillier A and Corkum P B 1994 Phys. Rev. A 49 2117
|
[108] |
Le A T, Wei H, Jin C and Lin C D 2016 J. Phys. B-At. Mol. Opt. Phys. 49 053001
|
[109] |
Morishita T, Le A T, Chen Z and Lin C D 2008 Phys. Rev. Lett. 100 013903
|
[110] |
Le A T, Lucchese R R, Tonzani S, Morishita T and Lin C D 2009 Phys. Rev. A 80 013401
|
[111] |
Le A T, Morishita T and Lin C D 2008 Phys. Rev. A 78 023814
|
[112] |
Le A T, Picca R D, Fainstein P D, Telnov D A, Lein M and Lin C D 2008 J. Phys. B-At. Mol. Opt. Phys. 41 081002
|
[113] |
Zhao S F, Wang Y, Wang G and Zhou X X 2014 Opt. Commun. 328 30
|
[114] |
Antoine P, L'Huillier A, Lewenstein M, Saliére P and Carré B 1996 Phys. Rev. A 53 1725
|
[115] |
Carroll D L 2001 FORTRAN Genetic Algorithm Driver, version 1.7a
|
[116] |
Goldberg D E 1989 Genetic Algorithms in Search, Optimization and Machine Learning (Reading: Addison-Wesley Professional)
|
[117] |
Mitchell M 1996 An Introduction to Genetic Algorithms (Cambridge: MIT Press)
|
[118] |
Xu J, Zhou H L, Chen Z and Lin C D 2009 Phys. Rev. A 79 052508
|
[119] |
Chu X and Chu S I 2001 Phys. Rev. A 64 021403
|
[120] |
Boyko O, Valentin C, Mercier B, Coquelet C, Pascal V, Papalazarou E, Rey G and Balcou P 2007 Phys. Rev. A 76 063811
|
[121] |
Powell M J D 2008 IMA J. Numer. Anal. 28 649
|
[122] |
Fletcher R 2000 Practical Methods of Optimization, 2nd edn. (New York: Wiley)
|
[123] |
Ishii N, Kaneshima K, Kitano K, Kanai T, Watanabe S and Itatani J 2014 Nat. Commun. 5 3331
|
[124] |
Cousin S L, Silva F, Teichmann S, Hemmer M, Buades B and Biegert J 2014 Opt. Lett. 39 5383
|
[125] |
Bartels R, Backus S, Zeek E, Misoguti L, Vdovin G, Christov I P, Murnane M M and Kapteyn H 2000 Nature 406 164
|
[126] |
Reitze D H, Kazamias S, Weihe F, Mullot G, Douillet D, Augé F, Albert O, Ramanathan V, Chambaret J P, Hulin D and Balcou P 2004 Opt. Lett. 29 86
|
[127] |
Walter D, Pfeiffer T, Winterfeldt C, Kemmer R, Spitzenpfeil R, Gerber G and Spielmann C 2006 Opt. Express 14 3433
|
[128] |
Jin C, Le A T and Lin C D 2009 Phys. Rev. A 79 053413
|
[129] |
Jin C, Stein G J, Hong K H and Lin C D 2015 Phys. Rev. Lett. 115 043901
|
[130] |
Gibson E A, Paul A, Wagner N, Tobey R, Gaudiosi D, Backus S, Christov I P, Aquila A, Gullikson E M, Attwood D T, Murnane M M and Kapteyn H C 2003 Science 302 95
|
[131] |
Zhang X, Lytle A L, Popmintchev T, Zhou X, Kapteyn H C, Murnane M M and Cohen O 2007 Nat. Phys. 3 270
|
[132] |
Igarashi H, Makida A and Sekikawa T 2013 Opt. Express 21 20632
|
[133] |
Winterfeldt C, Spielmann C and Gerber G 2008 Rev. Mod. Phys. 80 117
|
[134] |
Popmintchev D, Hernández-García C, Dollar F, et al. 2015 Science 350 1225
|
[135] |
Popmintchev T, Chen M C, Bahabad A, Gerrity M, Sidorenko P, Cohen O, Christov I P, Murnane M M and Kapteyn H C 2009 Proc. Natl. Acad. Sci. USA 106 10516
|
[136] |
Chen M C, Arpin P, Popmintchev T, Gerrity M, Zhang B, Seaberg M, Popmintchev D, Murnane M M and Kapteyn H C 2010 Phys. Rev. Lett. 105 173901
|
[137] |
Krebs M, Hädrich S, Demmler S, Rothhardt J, Zaïr A, Chipperfield L, Limpert J and Tünnermann A 2013 Nat. Photonics 7 555
|
[138] |
Hädrich S, Krebs M, Hoffmann A, Klenke A, Rothhardt J, Limpert J and Tünnermann A 2015 Light-Sci. Appl. 4 e320
|
[139] |
Wong M C H, Le A T, Alharbi A F, Boguslavskiy A E, Lucchese R R, Brichta J P, Lin C D and Bhardwaj V R 2013 Phys. Rev. Lett. 110 033006
|
[140] |
Blaga C I, Xu J, DiChiara A D, Sistrunk E, Zhang K, Agostini P, Miller T A, DiMauro L F and Lin C D 2012 Nature 483 194
|
[141] |
Xu J, Blaga C I, Zhang K, Lai Y H, Lin C D, Miller T A, Agostini P and DiMauro L F 2014 Nat. Commun. 5 4635
|
[142] |
Pullen M G, Wolter B, Le A T, Baudisch M, Hemmer M, Senftleben A, Schröter C D, Ullrich J, Moshammer R, Lin C D and Biegert J 2015 Nat. Commun. 6 7262
|
[143] |
Clerici M, Peccianti M, Schmidt B E, Caspani L, Shalaby M, Giguére M, Lotti A, Couairon A, Légaré F, Ozaki T, Faccio D and Morandotti R 2013 Phys. Rev. Lett. 110 253901
|
[144] |
Heissler P, Hörlein R, Mikhailova J M, Waldecker L, Tzallas P, Buck A, Schmid K, Sears C M S, Krausz F, Veisz L, Zepf M and Tsakiris G D 2012 Phys. Rev. Lett. 108 235003
|
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