Optika Atmosfery i Okeana Journal

Vol. 37, issue 11, article # 12

Zyatikov I. A., Losev V. F. Control of the spectral composition of coherent radiation on molecular nitrogen ions in laser plasma in the case of two-color pumping. // Optika Atmosfery i Okeana. 2024. V. 37. No. 11. P. 983–987. DOI: 10.15372/AOO20241112 [in Russian].
Copy the reference to clipboard

Abstract:

In recent years, laser sources created in airborne laser plasma by powerful femtosecond radiation pulses have been rapidly developing. This work studies coherent radiation generation on N₂⁺ ions in laser plasma using two-color pumping at l = 950 and 475 nm. It is shown that the addition of second harmonic radiation, wavelength of which is closer to the lasing lines on ions compared to the first harmonic, increases the intensity and stability of supercontinuum radiation which acts as seed radiation for the lasing. Such pumping allows lasing on new lines and controlling the intensity and spectral composition of the generated radiation. The results can be useful for establishing the way(s) of creating population inversion in laser plasma on molecular nitrogen ions.

Keywords:

two-color pumping, wavelength, generation, first and second harmonics, spectrum, synchronism angle, polarization

References:

1. Wang T.-J., Ju J., Daigle J.-F., Yuan S., Li R., Chin S.L. Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air // Laser Phys. Lett. 2013. V. 101. P. 25401. DOI: 10.1088/1612-2011/10/12/125401.
2. Ni J., Chu W., Jing C., Zhang H., Zeng B., Yao J., Li G., Xie H., Zhang C., Xu H., Chin S.L., Cheng Y., Xu Z. Identification of the physical mechanism of generation of coherent N₂ emissions in air by femtosecond laser excitation // Opt. Express. 2013. V. 21, N 7. P. 8746–8752. DOI: 10.1364/OE.21.008746.
3. Yao J., Li G., Jing C., Zeng B., Chu W., Ni J., Zhang H., Xie H., Zhang C., Li H., Xu H., Chin S.L., Cheng Y., Xu Z. Remote creation of coherent emissions in air with two-color ultrafast laser pulses // New J. Phys. 2013. V. 15, N 2. P. 023046. DOI: 10.1088/1367-2630/15/2/023046.
4. Liu Yi., Brelet Yohann, Point Guillaume, Houard Aurélien, Mysyrowicz André. Self-seeded lasing in ionized air pumped by 800 nm femtosecond laser pulses // Opt. Express. 2013. V. 21, N 19. P. 22791–22798. DOI: 10.1364/OE.21.022791.
5. Yao J., Zeng B., Xu H., Li G., Chu W., Ni J., Zhang H., Chin S.L., Cheng Y., Xu Z. High-brightness switchable multiwavelength remote laser in air // Phys. Rev. A. 2011. V. 84, N. 5. P. 051802. DOI: 10.1103/PhysRevA.84.051802.
6. Zyatikov I.A., Ivanov N.G., Losev V.F., Prokop'ev V.E. Issledovanie spektral'no-vremennykh parametrov sverkhizlucheniya na ionakh molekulyarnogo azota v vozdushnom filamente // Kvant. elektron. 2019. V. 49, N 10. P. 945–948. DOI: 10.1070/QEL17065.
7. Zyatikov I.A., Losev V.F., Lubenko D.M., Sandabkin E.A. Analysis of the active medium parameters of molecular nitrogen ions in ambient air // Opt. Lett. 2020. V. 45, N 23. P. 6518–6521. DOI: 10.1364/OL.403577.
8. Ivanov N.G., Zyatikov I.A., Losev V.F., Prokop’ev V.E. Temporal behavior of air lasing by molecular nitrogen ions // Opt. Commun. 2020. V. 456. P. 124573. DOI: 10.1016/j.optcom.2019.124.
9. Wang T.-J., Daigle J.-F., Ju J., Yuan S., Li R., Chin S.L. Forward lasing action at multiple wavelengths seeded by white light from a femtosecond laser filament in air // Phys. Rev. A. 2013. V. 88. P. 053429(1–5). DOI: 10.1103/PhysRevA.88.053429.
10. Wang S., Lötstedt E., Cao J., Fu Y., Zang H., Li H., Ando T., Iwasaki A., Yamanouchi K., Xu H. Population inversion in N₂⁺ by vibrationally mediated Rabi oscillation at 400 nm // Phys. Rev. A. 2021. V. 104. P. 032823. DOI: 10.1103/PhysRevA.104.032823.
11. Chen Y., Zhou C., Lu X., Xu L., Yuan Q., He S., Gong R., Zhang N., Wang Q., Huang S., Wu Y., Liu Y., Yao J. Influence of polarization ellipticity on N₂⁺ lasing in a strong laser field // Phys. Rev. A. 2024. V. 109. P. 053522. DOI: 10.1103/PhysRevA.109.053522.
12. Yao J., Chu W., Liu Z., Chen J., Xu B., Cheng Y. An anatomy of strong-field ionization-induced air lasing // Appl. Phys. B. 2018. V. 124, N 5. P. 73. DOI: 10.1007/s00340-018-6940-y.
13. Li G., Jing C., Zeng B., Xie H., Yao J., Chu W., Ni J., Zhang H., Xu H., Cheng Y., Xu Z. Signature of superradiance from a nitrogen-gas plasma channel produced by strong-field ionization // Phys. Rev. A. 2014. V. 89. P. 033833. DOI: 10.1103/PhysRevA.89.033833.
14. Lei M., Wu C., Liang Q., Zang A. The fast decay of ionized nitrogen molecules in laser filamentation investigated by a picosecond streak camera // J. Phys. B. Atom. Mol. Opt. Phys. 2017. V. 50. P. 145101. DOI: 10.1088/1361-6455/aa75f8.