Applied Physics Letters

Highly efficient microwave emission from DC-biased femtosecond laser filament in air

A A. A. Ushakov (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) N N. R. Vrublevskaya (Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,) E E. V. Mitina (Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,) D D. S. Uryupina (Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,) P P. A. Chizhov (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) T T. V. Dolmatov (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) V V. V. Bulgakova (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) K K. A. Galuyk (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) S S. V. Garnov (Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,) N N. A. Panov (Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,) A A. B. Savel'ev (Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,)

Abstract

We report observation of microwave radiation from the femtosecond filament in air biased by 10-kV/cm static transverse field with an amplitude ∼ 2 orders of magnitude higher than in the unbiased or weakly biased cases. Such powerful microwaves with the broadband spectrum at least from 2 to 13 GHz propagate at relatively small angles with respect to the laser beam axis. We propose and justify the physical mechanism of microwave emission: the microwaves are generated by the external-field-induced transverse plasma current which decreases during 100–500 ps after the laser pulse due to the electron-ion recombination.

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Article Details

Volume / Issue Vol. 129, Issue 2
Published July 13, 2026
ISSN 0003-6951
Publisher American Institute of Physics

Journal Info

Applied Physics Letters

American Institute of Physics
ISSN: 0003-6951 Physical Sciences

Authors (11)

A

A. A. Ushakov

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

N

N. R. Vrublevskaya

Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,

E

E. V. Mitina

Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,

D

D. S. Uryupina

Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,

P

P. A. Chizhov

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

T

T. V. Dolmatov

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

V

V. V. Bulgakova

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

K

K. A. Galuyk

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

S

S. V. Garnov

Prokhorov General Physics Institute of the Russian Academy of Sciences 1 , 38 Vavilov Street, Moscow 119991,

N

N. A. Panov

Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,

A

A. B. Savel'ev

Faculty of Physics, M. V. Lomonosov Moscow State University 2 , 1/62 Leninskie Gory, Moscow 119991,

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