Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Gas pressure dependence of microwave pulses generated by laser-produced filament plasmas

Abstract

The plasma arising due to the propagation of a filamenting ultrafast laser pulse in air contains currents driven by the pulse that generate radiated electromagnetic fields. We report absolutely calibrated measurements of the frequency spectrum of microwaves radiated by the filament plasma from 2–40 GHz. The emission pattern of the electric field spectrum is mapped as a function of air pressure from atmosphere to 0.5 Torr. For fixed laser pulse energy, duration, and focal geometry, we observe that decreasing the air pressure by a factor of approximately 103 increases the amplitude of the electric field waveform by a factor of about 40. As the air pressure decreases, the lower frequency components (<10GHz) increase in amplitude faster than those at higher frequencies (>20GHz). To the best of our knowledge, this behavior has not been observed before, is not predicted by existing theory, and implies the existence of a radiation mechanism in the plasma distinct from that which emits at terahertz frequencies.

© 2018 Optical Society of America

Full Article  |  PDF Article
More Like This
Coherently enhanced microwave pulses from midinfrared-driven laser plasmas

A. V. Mitrofanov, D. A. Sidorov-Biryukov, M. M. Nazarov, A. A. Voronin, M. V. Rozhko, A. B. Fedotov, and A. M. Zheltikov
Opt. Lett. 46(5) 1081-1084 (2021)

Optimization of microwave emission from laser filamentation with a machine learning algorithm

Alexander Englesbe, Jinpu Lin, John Nees, Adrian Lucero, Karl Krushelnick, and Andreas Schmitt-Sody
Appl. Opt. 60(25) G113-G125 (2021)

Electrical conductance of near-infrared femtosecond air filaments in the multi-filament regime

M. Burger, P. J. Skrodzki, J. Nees, and I. Jovanovic
Opt. Lett. 43(22) 5520-5523 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved