Abstract

We theoretically study the generation of terahertz (THz) radiation by two-color filamentation of ultrashort laser pulses with different wavelengths. We consider wavelengths in the range from 0.6 to 10.6 μm, thus covering the whole range of existing and future powerful laser sources in the near, mid and far-infrared. We show how different parameters of two-color filaments and generated THz pulses depend on the laser wavelength. We demonstrate that there is an optimal laser wavelength for two-color filamentation that provides the highest THz conversion efficiency and results in generation of extremely intense single cycle THz fields.

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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    [Crossref] [PubMed]
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  9. K. Y. Kim, A. J. Taylor, J. H. Glownia, and G. Rodriguez, “Coherent control of terahertz supercontinuum generation in ultrafast laser–gas interactions,” Nat. Photonics 2, 605–609 (2008).
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
  40. P. Klarskov, A. C. Strikwerda, K. Iwaszczuk, and P. U. Jepsen, “Experimental three-dimensional beam profiling and modeling of a terahertz beam generated from a two-color air plasma,” New J. Phys. 15, 075012 (2013).
    [Crossref]
  41. A. Gorodetsky, A. D. Koulouklidis, M. Massaouti, and S. Tzortzakis, “Physics of the conical broadband terahertz emission from two-color laser-induced plasma filaments,” Phys. Rev. A 89, 033838 (2014).
    [Crossref]

2018 (3)

V. Y. Fedorov and S. Tzortzakis, “Extreme THz fields from two-color filamentation of mid-infrared laser pulses,” Phys. Rev. A 97, 063839 (2018).
[Crossref]

A. Nguyen, P. González de Alaiza Martínez, I. Thiele, S. Skupin, and L. Bergé, “Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air,” Phys. Rev. A 97, 063839 (2018).
[Crossref]

V. Shumakova, S. Ališauskas, P. Malevich, C. Gollner, A. Baltuška, D. Kartashov, A. M. Zheltikov, A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, and A. Pugžlys, “Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances,” Opt. Lett. 43, 2185–2188 (2018).
[Crossref] [PubMed]

2017 (3)

Y. E. Geints and A. A. Zemlyanov, “Near- and mid-IR ultrashort laser pulse filamentation in a molecular atmosphere: a comparative analysis,” Appl. Opt. 56, 1397 (2017).
[Crossref]

I. Dey, K. Jana, V. Y. Fedorov, A. D. Koulouklidis, A. Mondal, M. Shaikh, D. Sarkar, A. D. Lad, S. Tzortzakis, A. Couairon, and G. R. Kumar, “Highly efficient broadband terahertz generation from ultrashort laser filamentation in liquids,” Nat. Commun. 8, 1184 (2017).
[Crossref] [PubMed]

X. C. Zhang, A. Shkurinov, and Y. Zhang, “Extreme terahertz science,” Nat. Photonics 11, 16–18 (2017).
[Crossref]

2016 (5)

D. Kuk, Y. J. Yoo, E. W. Rosenthal, N. Jhajj, H. M. Milchberg, and K. Y. Kim, “Generation of scalable terahertz radiation from cylindrically focused two-color laser pulses in air,” Appl. Phys. Lett. 108, 121106 (2016).
[Crossref]

V. A. Andreeva, O. G. Kosareva, N. A. Panov, D. E. Shipilo, P. M. Solyankin, M. N. Esaulkov, P. G. D. A. Martínez, A. P. Shkurinov, V. A. Makarov, L. Bergé, and S. L. Chin, “Ultrabroad Terahertz Spectrum Generation from an Air-Based Filament Plasma,” Phys. Rev. Lett. 116, 063902 (2016).
[Crossref] [PubMed]

N. A. Panov, D. E. Shipilo, V. A. Andreeva, O. G. Kosareva, A. M. Saletsky, H. Xu, and P. Polynkin, “Supercontinuum of a 3.9-μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption,” Phys. Rev. A 94, 041801 (2016).
[Crossref]

A. Nguyen, P. G. d. A. Martinez, J. Dechard, I. Thiele, I. Babushkin, S. Skupin, and L. Berge, “Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength,” Opt. Express 25, 4720–4740 (2016).
[Crossref]

K. Liu, A. D. Koulouklidis, D. G. Papazoglou, S. Tzortzakis, and X.-C. Zhang, “Enhanced terahertz wave emission from air-plasma tailored by abruptly autofocusing laser beams,” Optica 3, 605–608 (2016).
[Crossref]

2015 (3)

P. Panagiotopoulos, P. Whalen, M. Kolesik, and J. V. Moloney, “Super high power mid-infrared femtosecond light bullet,” Nat. Photonics 9, 543–548 (2015).
[Crossref]

M. Shalaby and C. P. Hauri, “Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness,” Nat. Commun. 6, 1–8 (2015).
[Crossref]

A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
[Crossref]

2014 (7)

R. A. Lewis, “A review of terahertz sources,” J. Phys. D: Appl. Phys. 47, 374001 (2014).
[Crossref]

W. R. Huang, S.-W. Huang, E. Granados, K. Ravi, K.-H. Hong, L. E. Zapata, and F. X. Kärtner, “Highly efficient terahertz pulse generation by optical rectification in stoichiometric and cryo-cooled congruent lithium niobate,” J. Mod. Opt. 62, 1–8 (2014).

T. I. Oh, Y. J. Yoo, Y. S. You, and K. Y. Kim, “Generation of strong terahertz fields exceeding 8 MV/cm at 1 kHz and real-time beam profiling,” Appl. Phys. Lett. 105, 041103 (2014).
[Crossref]

A. Gorodetsky, A. D. Koulouklidis, M. Massaouti, and S. Tzortzakis, “Physics of the conical broadband terahertz emission from two-color laser-induced plasma filaments,” Phys. Rev. A 89, 033838 (2014).
[Crossref]

J. A. Fülöp, Z. Ollmann, C. Lombosi, C. Skrobol, S. Klingebiel, L. Pálfalvi, F. Krausz, S. Karsch, and J. Hebling, “Efficient generation of THz pulses with 0.4 mJ energy,” Opt. Express 22, 20155 (2014).
[Crossref] [PubMed]

Y. E. Geints and A. A. Zemlyanov, “Dynamics of CO2 laser pulse filamentation in air influenced by spectrally selective molecular absorption,” Appl. Opt. 53, 5641–5648 (2014).
[Crossref] [PubMed]

C. Vicario, A. V. Ovchinnikov, S. I. Ashitkov, M. B. Agranat, V. E. Fortov, and C. P. Hauri, “Generation of 0.9-mJ THz pulses in DSTMS pumped by a Cr:Mg2SiO4 laser,” Opt. Lett. 39, 6632–6635 (2014).
[Crossref] [PubMed]

2013 (4)

V. Blank, M. D. Thomson, and H. G. Roskos, “Spatio-spectral characteristics of ultra-broadband THz emission from two-colour photoexcited gas plasmas and their impact for nonlinear spectroscopy,” New J. Phys. 15, 075023 (2013).
[Crossref]

P. Klarskov, A. C. Strikwerda, K. Iwaszczuk, and P. U. Jepsen, “Experimental three-dimensional beam profiling and modeling of a terahertz beam generated from a two-color air plasma,” New J. Phys. 15, 075012 (2013).
[Crossref]

M. Clerici, M. Peccianti, B. E. Schmidt, L. Caspani, M. Shalaby, M. Giguère, A. Lotti, A. Couairon, F. Légaré, T. Ozaki, D. Faccio, and R. Morandotti, “Wavelength scaling of terahertz generation by gas ionization,” Phys. Rev. Lett. 110, 253901 (2013).
[Crossref] [PubMed]

L. Bergé, S. Skupin, C. Köhler, I. Babushkin, and J. Herrmann, “3D numerical simulations of THz generation by two-color laser filaments,” Phys. Rev. Lett. 110, 073901 (2013).
[Crossref] [PubMed]

2012 (1)

2011 (3)

W.-M. Wang, S. Kawata, Z.-M. Sheng, Y.-T. Li, L.-M. Chen, L.-J. Qian, and J. Zhang, “Efficient terahertz emission by mid-infrared laser pulses from gas targets,” Opt. Lett. 36, 2608–2610 (2011).
[Crossref] [PubMed]

A. Couairon, E. Brambilla, T. Corti, D. Majus, O. Ramírez-Góngora, and M. Kolesik, “Practitioner’s guide to laser pulse propagation models and simulation,” The Eur. Phys. J. Special Top. 199, 5–76 (2011).
[Crossref]

T. J. Wang, J. F. Daigle, S. Yuan, F. Théberge, M. Châteauneuf, J. Dubois, G. Roy, H. Zeng, and S. L. Chin, “Remote generation of high-energy terahertz pulses from two-color femtosecond laser filamentation in air,” Phys. Rev. A 83, 053801 (2011).
[Crossref]

2010 (2)

T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
[Crossref]

I. Babushkin, W. Kuehn, C. Köhler, S. Skupin, L. Bergé, K. Reimann, M. Woerner, J. Herrmann, and T. Elsaesser, “Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases,” Phys. Rev. Lett. 105, 053903 (2010).
[Crossref] [PubMed]

2008 (1)

K. Y. Kim, A. J. Taylor, J. H. Glownia, and G. Rodriguez, “Coherent control of terahertz supercontinuum generation in ultrafast laser–gas interactions,” Nat. Photonics 2, 605–609 (2008).
[Crossref]

2007 (3)

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1, 97–105 (2007).
[Crossref]

K. Reimann, “Table-top sources of ultrashort THz pulses,” Reports on Prog. Phys. 70, 1597–1632 (2007).
[Crossref]

K.-Y. Kim, J. H. Glownia, A. J. Taylor, and G. Rodriguez, “Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields,” Opt. Express 15, 4577–4584 (2007).
[Crossref] [PubMed]

2006 (1)

H. Zhong, N. Karpowicz, and X. C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88, 261103 (2006).
[Crossref]

2004 (1)

M. Kolesik and J. V. Moloney, “Nonlinear optical pulse propagation simulation: From Maxwell’s to unidirectional equations,” Phys. Rev. E 70, 036604 (2004).
[Crossref]

2002 (1)

M. Kolesik, J. V. Moloney, and M. Mlejnek, “Unidirectional Optical Pulse Propagation Equation,” Phys. Rev. Lett. 89, 283902 (2002).
[Crossref]

1967 (1)

A. M. Perelomov, V. S. Popov, and M. V. Terent’ev, “Ionization of atoms in an alternating electric field: II,” Sov. Phys. JETP 24, 207–217 (1967).

Agranat, M. B.

Ališauskas, S.

V. Shumakova, S. Ališauskas, P. Malevich, C. Gollner, A. Baltuška, D. Kartashov, A. M. Zheltikov, A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, and A. Pugžlys, “Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances,” Opt. Lett. 43, 2185–2188 (2018).
[Crossref] [PubMed]

A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
[Crossref]

Andreeva, V. A.

V. A. Andreeva, O. G. Kosareva, N. A. Panov, D. E. Shipilo, P. M. Solyankin, M. N. Esaulkov, P. G. D. A. Martínez, A. P. Shkurinov, V. A. Makarov, L. Bergé, and S. L. Chin, “Ultrabroad Terahertz Spectrum Generation from an Air-Based Filament Plasma,” Phys. Rev. Lett. 116, 063902 (2016).
[Crossref] [PubMed]

N. A. Panov, D. E. Shipilo, V. A. Andreeva, O. G. Kosareva, A. M. Saletsky, H. Xu, and P. Polynkin, “Supercontinuum of a 3.9-μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption,” Phys. Rev. A 94, 041801 (2016).
[Crossref]

Andriukaitis, G.

A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
[Crossref]

Ashitkov, S. I.

Babushkin, I.

A. Nguyen, P. G. d. A. Martinez, J. Dechard, I. Thiele, I. Babushkin, S. Skupin, and L. Berge, “Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength,” Opt. Express 25, 4720–4740 (2016).
[Crossref]

L. Bergé, S. Skupin, C. Köhler, I. Babushkin, and J. Herrmann, “3D numerical simulations of THz generation by two-color laser filaments,” Phys. Rev. Lett. 110, 073901 (2013).
[Crossref] [PubMed]

I. Babushkin, W. Kuehn, C. Köhler, S. Skupin, L. Bergé, K. Reimann, M. Woerner, J. Herrmann, and T. Elsaesser, “Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases,” Phys. Rev. Lett. 105, 053903 (2010).
[Crossref] [PubMed]

Baltuška, A.

V. Shumakova, S. Ališauskas, P. Malevich, C. Gollner, A. Baltuška, D. Kartashov, A. M. Zheltikov, A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, and A. Pugžlys, “Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances,” Opt. Lett. 43, 2185–2188 (2018).
[Crossref] [PubMed]

A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
[Crossref]

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Bergé, L.

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T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
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T. J. Wang, J. F. Daigle, S. Yuan, F. Théberge, M. Châteauneuf, J. Dubois, G. Roy, H. Zeng, and S. L. Chin, “Remote generation of high-energy terahertz pulses from two-color femtosecond laser filamentation in air,” Phys. Rev. A 83, 053801 (2011).
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T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
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T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
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A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
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A. Nguyen, P. González de Alaiza Martínez, I. Thiele, S. Skupin, and L. Bergé, “Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air,” Phys. Rev. A 97, 063839 (2018).
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I. Babushkin, W. Kuehn, C. Köhler, S. Skupin, L. Bergé, K. Reimann, M. Woerner, J. Herrmann, and T. Elsaesser, “Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases,” Phys. Rev. Lett. 105, 053903 (2010).
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W. R. Huang, S.-W. Huang, E. Granados, K. Ravi, K.-H. Hong, L. E. Zapata, and F. X. Kärtner, “Highly efficient terahertz pulse generation by optical rectification in stoichiometric and cryo-cooled congruent lithium niobate,” J. Mod. Opt. 62, 1–8 (2014).

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Kim, K. Y.

D. Kuk, Y. J. Yoo, E. W. Rosenthal, N. Jhajj, H. M. Milchberg, and K. Y. Kim, “Generation of scalable terahertz radiation from cylindrically focused two-color laser pulses in air,” Appl. Phys. Lett. 108, 121106 (2016).
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P. Klarskov, A. C. Strikwerda, K. Iwaszczuk, and P. U. Jepsen, “Experimental three-dimensional beam profiling and modeling of a terahertz beam generated from a two-color air plasma,” New J. Phys. 15, 075012 (2013).
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L. Bergé, S. Skupin, C. Köhler, I. Babushkin, and J. Herrmann, “3D numerical simulations of THz generation by two-color laser filaments,” Phys. Rev. Lett. 110, 073901 (2013).
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A. D. Koulouklidis, C. Gollner, V. Shumakova, V. Y. Fedorov, A. Pugžlys, A. Baltuška, and S. Tzortzakis, “Strong thz fields from mid-infrared two-color laser filaments,” in Book of abstracts of International Conference on Laser Filamentation (COFIL), (2018), pp. 54–55.

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I. Babushkin, W. Kuehn, C. Köhler, S. Skupin, L. Bergé, K. Reimann, M. Woerner, J. Herrmann, and T. Elsaesser, “Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases,” Phys. Rev. Lett. 105, 053903 (2010).
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K.-Y. Kim, J. H. Glownia, A. J. Taylor, and G. Rodriguez, “Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields,” Opt. Express 15, 4577–4584 (2007).
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D. Kuk, Y. J. Yoo, E. W. Rosenthal, N. Jhajj, H. M. Milchberg, and K. Y. Kim, “Generation of scalable terahertz radiation from cylindrically focused two-color laser pulses in air,” Appl. Phys. Lett. 108, 121106 (2016).
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M. Clerici, M. Peccianti, B. E. Schmidt, L. Caspani, M. Shalaby, M. Giguère, A. Lotti, A. Couairon, F. Légaré, T. Ozaki, D. Faccio, and R. Morandotti, “Wavelength scaling of terahertz generation by gas ionization,” Phys. Rev. Lett. 110, 253901 (2013).
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Shipilo, D. E.

N. A. Panov, D. E. Shipilo, V. A. Andreeva, O. G. Kosareva, A. M. Saletsky, H. Xu, and P. Polynkin, “Supercontinuum of a 3.9-μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption,” Phys. Rev. A 94, 041801 (2016).
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V. Shumakova, S. Ališauskas, P. Malevich, C. Gollner, A. Baltuška, D. Kartashov, A. M. Zheltikov, A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, and A. Pugžlys, “Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances,” Opt. Lett. 43, 2185–2188 (2018).
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A. Nguyen, P. G. d. A. Martinez, J. Dechard, I. Thiele, I. Babushkin, S. Skupin, and L. Berge, “Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength,” Opt. Express 25, 4720–4740 (2016).
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A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, A. Pugžlys, E. A. Stepanov, G. Andriukaitis, T. Flöry, S. Ališauskas, a. B. Fedotov, A. Baltuška, and A. M. Zheltikov, “Mid-infrared laser filaments in the atmosphere,” Sci. Reports 5, 8368 (2015).
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K.-Y. Kim, J. H. Glownia, A. J. Taylor, and G. Rodriguez, “Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields,” Opt. Express 15, 4577–4584 (2007).
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A. M. Perelomov, V. S. Popov, and M. V. Terent’ev, “Ionization of atoms in an alternating electric field: II,” Sov. Phys. JETP 24, 207–217 (1967).

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J.-F. Daigle, F. Théberge, M. Henriksson, T.-J. J. Wang, S. Yuan, M. Châteauneuf, J. Dubois, M. Piché, and S. L. Chin, “Remote THz generation from two-color filamentation: long distance dependence,” Opt. Express 20, 6825–6834 (2012).
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T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
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A. Nguyen, P. González de Alaiza Martínez, I. Thiele, S. Skupin, and L. Bergé, “Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air,” Phys. Rev. A 97, 063839 (2018).
[Crossref]

A. Nguyen, P. G. d. A. Martinez, J. Dechard, I. Thiele, I. Babushkin, S. Skupin, and L. Berge, “Spectral dynamics of THz pulses generated by two-color laser filaments in air: The role of Kerr nonlinearities and pump wavelength,” Opt. Express 25, 4720–4740 (2016).
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V. Blank, M. D. Thomson, and H. G. Roskos, “Spatio-spectral characteristics of ultra-broadband THz emission from two-colour photoexcited gas plasmas and their impact for nonlinear spectroscopy,” New J. Phys. 15, 075023 (2013).
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Voronin, A. A.

V. Shumakova, S. Ališauskas, P. Malevich, C. Gollner, A. Baltuška, D. Kartashov, A. M. Zheltikov, A. V. Mitrofanov, A. A. Voronin, D. A. Sidorov-Biryukov, and A. Pugžlys, “Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances,” Opt. Lett. 43, 2185–2188 (2018).
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T. J. Wang, J. F. Daigle, S. Yuan, F. Théberge, M. Châteauneuf, J. Dubois, G. Roy, H. Zeng, and S. L. Chin, “Remote generation of high-energy terahertz pulses from two-color femtosecond laser filamentation in air,” Phys. Rev. A 83, 053801 (2011).
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T. J. Wang, S. Yuan, Y. Chen, J. F. Daigle, C. Marceau, F. Théberge, M. Châteauneuf, J. Dubois, and S. L. Chin, “Toward remote high energy terahertz generation,” Appl. Phys. Lett. 97, 111108 (2010).
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Wang, W.-M.

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P. Panagiotopoulos, P. Whalen, M. Kolesik, and J. V. Moloney, “Super high power mid-infrared femtosecond light bullet,” Nat. Photonics 9, 543–548 (2015).
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N. A. Panov, D. E. Shipilo, V. A. Andreeva, O. G. Kosareva, A. M. Saletsky, H. Xu, and P. Polynkin, “Supercontinuum of a 3.9-μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption,” Phys. Rev. A 94, 041801 (2016).
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H. Zhong, N. Karpowicz, and X. C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88, 261103 (2006).
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“HITRAN on the Web,” http://hitran.iao.ru/ .

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Figures (6)

Fig. 1
Fig. 1 (a) Normalized peak intensity and (b) peak fluence versus propagation distance for several wavelengths λ0 of the fundamental pulse. The normalization factor is the same for all wavelengths. (c) Maximum peak intensity Imax and (d) maximum peak fluence Fmax versus the wavelength λ0 of the fundamental pulse.
Fig. 2
Fig. 2 (a) Filament length (FWHM) and (b) filament diameter (FWHM) versus the wavelength λ0 of the fundamental pulse.
Fig. 3
Fig. 3 Normalized peak (a) and integrated over radius (b) plasma densities versus propagation distance for several wavelengths λ0 of the fundamental pulse. The normalization factor is the same for all wavelengths. (c) Maximum peak plasma density ρmax and (d) maximum integrated plasma density Iρ versus the wavelength λ0 of the fundamental pulse.
Fig. 4
Fig. 4 Dependence of the integrated over radius pulse power spectrum S on the propagation distance z and frequency f for (a) 3.2 μm, (b) 6 μm, and (c) 9 μm two-color laser pulses.
Fig. 5
Fig. 5 Normalized power spectra (integrated over radius) of laser pulses with different wavelength λ0. The plots are in log scale and the normalization factor is the same for all wavelengths. All spectra are obtained in the point of lens focus at distance 200 mm. The gray shaded areas show the parts of the spectra that we attribute to the generated THz radiation.
Fig. 6
Fig. 6 (a) Energy of generated THz pulse WTHz, (b) THz conversion efficiency QTHz, (c) peak THz electric field ETHz, and (d) THz emission angle θTHz versus the wavelength λ0 of the fundamental laser pulse.

Equations (1)

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E = exp ( r 2 2 a 0 2 t 2 2 τ 0 2 ) [ E 1 cos ( ω 0 t ) + E 2 cos ( 2 ω 0 t ) ] ,

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