Low intensity laser pulse train propagation in air: part II: experimental studies

Vladimir Markov; Igor Marienko; Gavin Blair; Phillip Sprangle

doi:10.1117/12.2675065

3 October 2023 Low intensity laser pulse train propagation in air: part II: experimental studies

Vladimir Markov, Igor Marienko, Gavin Blair, Phillip Sprangle

Proceedings Volume 12691, Laser Communication and Propagation through the Atmosphere and Oceans XII; 126910L (2023) https://doi.org/10.1117/12.2675065
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

This paper discusses the results of experimental studies of low intensity laser pulse train (LI-LPT) propagation in air. The train of ultra-short laser pulses of adjustable repetition rate became possible with the intra-cavity longitudinal mode selector that improves the efficiency of the mode locking mechanism. This technique enabled the generation of a LPT with an envelope duration T_PL ≈ 40 ns (FWHM). The envelope is filled with a train of micro-pulses that form a temporal comb with an individual micro-pulse duration τ_L ≥ 150 ps. The micro-pulse separation time, T_P, can be tuned from ~10 ns to 0.45 ns. Depending on the pump level, the total energy E_LPT of the LPT is in the range of 150 mJ and 1.2 J. When focused in air, the LPT with peak micro-pulse intensity ranging from 5×10¹⁴ W/cm² to 10¹⁶ W/cm² generates a plasma. The laser induced plasma leads to laser light scattering, broadband luminescence, and generation of rf radiation. We report the first results of the experimental studies of the interaction of the LI-LPT with air. Theoretical analysis and simulations of the filamentation and rf radiation have been carried out. The results of the experiment are in agreement with the theoretical and simulation results.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Vladimir Markov, Igor Marienko, Gavin Blair, and Phillip Sprangle "Low intensity laser pulse train propagation in air: part II: experimental studies", Proc. SPIE 12691, Laser Communication and Propagation through the Atmosphere and Oceans XII, 126910L (3 October 2023); https://doi.org/10.1117/12.2675065

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