Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark

A. A. Ushakov; P. A. Chizhov; Vera Andreeva; N. A. Panov; D. E. Shipilo; M. Matoba; N. Nemoto; N. Kanda; K. Konishi; V. V. Bukin; M. Kuwata-Gonokami; O. G. Kosareva; S. V. Garnov; A. B. Savel’Ev

doi:10.1364/OE.26.018202

Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark

A. A. Ushakov, P. A. Chizhov, Vera Andreeva, N. A. Panov, D. E. Shipilo, M. Matoba, N. Nemoto, N. Kanda, K. Konishi, V. V. Bukin, M. Kuwata-Gonokami, O. G. Kosareva, S. V. Garnov, A. B. Savel’Ev

School of Mathematics

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

We study angular and frequency-angular distributions of the terahertz (THz) emission of the low-frequency region (0.3–3 THz) from a two-color femtosecond plasma spark experimentally and in three-dimensional numerical simulations. We investigate the dependence of the angular shapes of the THz radiation on focusing conditions and pulse durations by using two laser facilities (pulse durations 35 and 150 fs) for different focusing geometries. Our experiments and simulations show that decrease in the numerical aperture from NA ≈0.2 to NA ≈0.02 results simultaneously in (I) squeezing of the THz angular distribution and (II) formation of the bright conical emission in the THz range. The moderate focusing NA ≈0.05, which forms the relatively narrow unimodal THz angular distribution, is identified as optimal in terms of angular divergence. Numerical simulations with carrier wave resolved show that bright THz ring structures appear at the frequencies ≥ 2 THz for longer focuses (NA ≈0.02), while for optimal focusing conditions NA ≈0.05 the conical emission develops at THz frequencies higher than 10 THz.

Original language	English (US)
Pages (from-to)	18202-18213
Number of pages	12
Journal	Optics Express
Volume	26
Issue number	14
DOIs	https://doi.org/10.1364/OE.26.018202
State	Published - Jul 9 2018

Bibliographical note

Funding Information:
Russian Foundation for Basic Research (RFBR) (18-02-00954, 18-52-16020, 18-32-01000); Russian Federation President grant (MK-8562.2016.2); Presidium of the Russian Academy of Sciences Program (I.6); Students and Researchers Exchange Program in Sciences (STEPS); “Basis” Foundation; Scholarship of Russian Federation President (SP-2453.2018.2); The program “UMNIK” of Foundation of assistance to development of small forms of enterprises in scientific-technical sphere (FASIE) (11488GU/2017, 11522GU/2017); The Photon Frontier Network Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT).

Publisher Copyright:
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

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10.1364/OE.26.018202

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Ushakov, A. A., Chizhov, P. A., Andreeva, V., Panov, N. A., Shipilo, D. E., Matoba, M., Nemoto, N., Kanda, N., Konishi, K., Bukin, V. V., Kuwata-Gonokami, M., Kosareva, O. G., Garnov, S. V., & Savel’Ev, A. B. (2018). Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark. Optics Express, 26(14), 18202-18213. https://doi.org/10.1364/OE.26.018202

Ushakov, AA, Chizhov, PA, Andreeva, V, Panov, NA, Shipilo, DE, Matoba, M, Nemoto, N, Kanda, N, Konishi, K, Bukin, VV, Kuwata-Gonokami, M, Kosareva, OG, Garnov, SV & Savel’Ev, AB 2018, 'Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark', Optics Express, vol. 26, no. 14, pp. 18202-18213. https://doi.org/10.1364/OE.26.018202

@article{38e881273f6644488360273d7a103d3f,

title = "Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark",

abstract = "We study angular and frequency-angular distributions of the terahertz (THz) emission of the low-frequency region (0.3–3 THz) from a two-color femtosecond plasma spark experimentally and in three-dimensional numerical simulations. We investigate the dependence of the angular shapes of the THz radiation on focusing conditions and pulse durations by using two laser facilities (pulse durations 35 and 150 fs) for different focusing geometries. Our experiments and simulations show that decrease in the numerical aperture from NA ≈0.2 to NA ≈0.02 results simultaneously in (I) squeezing of the THz angular distribution and (II) formation of the bright conical emission in the THz range. The moderate focusing NA ≈0.05, which forms the relatively narrow unimodal THz angular distribution, is identified as optimal in terms of angular divergence. Numerical simulations with carrier wave resolved show that bright THz ring structures appear at the frequencies ≥ 2 THz for longer focuses (NA ≈0.02), while for optimal focusing conditions NA ≈0.05 the conical emission develops at THz frequencies higher than 10 THz.",

author = "Ushakov, {A. A.} and Chizhov, {P. A.} and Vera Andreeva and Panov, {N. A.} and Shipilo, {D. E.} and M. Matoba and N. Nemoto and N. Kanda and K. Konishi and Bukin, {V. V.} and M. Kuwata-Gonokami and Kosareva, {O. G.} and Garnov, {S. V.} and Savel{\textquoteright}Ev, {A. B.}",

note = "Funding Information: Russian Foundation for Basic Research (RFBR) (18-02-00954, 18-52-16020, 18-32-01000); Russian Federation President grant (MK-8562.2016.2); Presidium of the Russian Academy of Sciences Program (I.6); Students and Researchers Exchange Program in Sciences (STEPS); “Basis” Foundation; Scholarship of Russian Federation President (SP-2453.2018.2); The program “UMNIK” of Foundation of assistance to development of small forms of enterprises in scientific-technical sphere (FASIE) (11488GU/2017, 11522GU/2017); The Photon Frontier Network Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT). Publisher Copyright: {\textcopyright} 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",

year = "2018",

month = jul,

day = "9",

doi = "10.1364/OE.26.018202",

language = "English (US)",

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journal = "Optics Express",

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TY - JOUR

T1 - Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark

AU - Ushakov, A. A.

AU - Chizhov, P. A.

AU - Andreeva, Vera

AU - Panov, N. A.

AU - Shipilo, D. E.

AU - Matoba, M.

AU - Nemoto, N.

AU - Kanda, N.

AU - Konishi, K.

AU - Bukin, V. V.

AU - Kuwata-Gonokami, M.

AU - Kosareva, O. G.

AU - Garnov, S. V.

AU - Savel’Ev, A. B.

N1 - Funding Information: Russian Foundation for Basic Research (RFBR) (18-02-00954, 18-52-16020, 18-32-01000); Russian Federation President grant (MK-8562.2016.2); Presidium of the Russian Academy of Sciences Program (I.6); Students and Researchers Exchange Program in Sciences (STEPS); “Basis” Foundation; Scholarship of Russian Federation President (SP-2453.2018.2); The program “UMNIK” of Foundation of assistance to development of small forms of enterprises in scientific-technical sphere (FASIE) (11488GU/2017, 11522GU/2017); The Photon Frontier Network Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT). Publisher Copyright: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

PY - 2018/7/9

Y1 - 2018/7/9

N2 - We study angular and frequency-angular distributions of the terahertz (THz) emission of the low-frequency region (0.3–3 THz) from a two-color femtosecond plasma spark experimentally and in three-dimensional numerical simulations. We investigate the dependence of the angular shapes of the THz radiation on focusing conditions and pulse durations by using two laser facilities (pulse durations 35 and 150 fs) for different focusing geometries. Our experiments and simulations show that decrease in the numerical aperture from NA ≈0.2 to NA ≈0.02 results simultaneously in (I) squeezing of the THz angular distribution and (II) formation of the bright conical emission in the THz range. The moderate focusing NA ≈0.05, which forms the relatively narrow unimodal THz angular distribution, is identified as optimal in terms of angular divergence. Numerical simulations with carrier wave resolved show that bright THz ring structures appear at the frequencies ≥ 2 THz for longer focuses (NA ≈0.02), while for optimal focusing conditions NA ≈0.05 the conical emission develops at THz frequencies higher than 10 THz.

AB - We study angular and frequency-angular distributions of the terahertz (THz) emission of the low-frequency region (0.3–3 THz) from a two-color femtosecond plasma spark experimentally and in three-dimensional numerical simulations. We investigate the dependence of the angular shapes of the THz radiation on focusing conditions and pulse durations by using two laser facilities (pulse durations 35 and 150 fs) for different focusing geometries. Our experiments and simulations show that decrease in the numerical aperture from NA ≈0.2 to NA ≈0.02 results simultaneously in (I) squeezing of the THz angular distribution and (II) formation of the bright conical emission in the THz range. The moderate focusing NA ≈0.05, which forms the relatively narrow unimodal THz angular distribution, is identified as optimal in terms of angular divergence. Numerical simulations with carrier wave resolved show that bright THz ring structures appear at the frequencies ≥ 2 THz for longer focuses (NA ≈0.02), while for optimal focusing conditions NA ≈0.05 the conical emission develops at THz frequencies higher than 10 THz.

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U2 - 10.1364/OE.26.018202

DO - 10.1364/OE.26.018202

M3 - Article

C2 - 30114100

AN - SCOPUS:85049581405

SN - 1094-4087

VL - 26

SP - 18202

EP - 18213

JO - Optics Express

JF - Optics Express

IS - 14

ER -

Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark

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