We measured the key characteristics of the backward terahertz (THz) emission from a two-color femtosecond laser spark in air: waveform, spectrum, and energy. Through the controlled reflection of the forward THz pulse, we observed the backward and forward ones in the same waveform and hence directly evidenced the origin of the backward THz radiation from the plasma spark. The spectrum of the backward THz radiation is shifted to the low-frequency range as compared with the forward one. Measurements of the energy of the backward and forward THz pulses for different pump pulse energies provide their ratio to be ∼5.5%, which quantitatively agrees with the results of our numerical simulations. These results can be useful for the noninvasive monitoring of forward THz emission parameters by the backward one.
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25 February 2019
Research Article|
February 28 2019
Waveform, spectrum, and energy of backward terahertz emission from two-color femtosecond laser induced microplasma
A. A. Ushakov
;
A. A. Ushakov
a)
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
2
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences
, 38 Vavilov Street, Moscow 119991, Russia
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N. A. Panov
;
N. A. Panov
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
3
P.N. Lebedev Physical Institute of Russian Academy of Sciences
, 53 Leninskiy prospect, Moscow 119991, Russia
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P. A. Chizhov
;
P. A. Chizhov
2
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences
, 38 Vavilov Street, Moscow 119991, Russia
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D. E. Shipilo
;
D. E. Shipilo
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
3
P.N. Lebedev Physical Institute of Russian Academy of Sciences
, 53 Leninskiy prospect, Moscow 119991, Russia
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V. V. Bukin;
V. V. Bukin
2
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences
, 38 Vavilov Street, Moscow 119991, Russia
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A. B. Savel'ev
;
A. B. Savel'ev
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
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S. V. Garnov;
S. V. Garnov
2
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences
, 38 Vavilov Street, Moscow 119991, Russia
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O. G. Kosareva
O. G. Kosareva
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
3
P.N. Lebedev Physical Institute of Russian Academy of Sciences
, 53 Leninskiy prospect, Moscow 119991, Russia
4
Institute of Modern Optics, Nankai University
, Tianjin 300350, China
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A. A. Ushakov
1,2,a)
N. A. Panov
1,3
P. A. Chizhov
2
D. E. Shipilo
1,3
V. V. Bukin
2
A. B. Savel'ev
1
S. V. Garnov
2
O. G. Kosareva
1,3,4
1
Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University
, 1/62 Leninskie Gori, Moscow 119991, Russia
2
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences
, 38 Vavilov Street, Moscow 119991, Russia
3
P.N. Lebedev Physical Institute of Russian Academy of Sciences
, 53 Leninskiy prospect, Moscow 119991, Russia
4
Institute of Modern Optics, Nankai University
, Tianjin 300350, China
Appl. Phys. Lett. 114, 081102 (2019)
Article history
Received:
November 07 2018
Accepted:
February 07 2019
Citation
A. A. Ushakov, N. A. Panov, P. A. Chizhov, D. E. Shipilo, V. V. Bukin, A. B. Savel'ev, S. V. Garnov, O. G. Kosareva; Waveform, spectrum, and energy of backward terahertz emission from two-color femtosecond laser induced microplasma. Appl. Phys. Lett. 25 February 2019; 114 (8): 081102. https://doi.org/10.1063/1.5080338
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