TY - JOUR

T1 - Pulsed inductive CO2 laser with radio-frequency excitation and influence of the H2 content on the efficiency and lasing temporal characteristics

AU - Razhev, A. M.

AU - Kargapoltsev, E. S.

AU - Churkin, D. S.

AU - Trunov, I. A.

N1 - Funding Information: The author’s team would like to thank I V Sherstov, an employee of the Quantum Optical Technologies Laboratory of the Interdisciplinary Quantum Center, Novosibirsk State University, for the provision of the VIGO IR detector of pulsed optical signals and the cooled photo-resistor. Funding Information: The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. 121033100059-5). Publisher Copyright: © 2022 Astro Ltd.

PY - 2023/1/1

Y1 - 2023/1/1

N2 - In 2021, data on the effective pulsed gas discharge inductive CO2 laser with radio-frequency (RF) excitation were published with a pulse output energy of E∼ 1 J (the efficiency η∼ 14.5%) on the gas mixture He:N2:CO2 = 8:2:1. The efficiency of the developed CO2 laser had exceeded the value η∼ 21% at E∼ 350 mJ. At the beginning of 2022, it was shown that xenon addition (Xe = 4%) to the gas mixture made it possible to achieve an efficiency of η∼ 27% at an output energy of E∼ 600 mJ. For the first time, the effect of hydrogen additives in the active medium (He:N2:CO2:H2 and N2:CO2:H2 gas mixtures) was investigated for a pulsed inductive CO2 laser with RF excitation depending on the RF-pumping pulse duration value (τ), which allows the energy and temporal radiation characteristics of the laser to be controlled over a wider range. In addition to those already published, new experimental data have been obtained, namely the output beam profile of the inductive CO2 laser based on He:N2:CO2 = 8:2:1 gas mixture depending on the τ value. The new data will improve our understanding of inductive CO2 laser physics and of the plasma-chemical processes occurring in its active medium. RF current pulses propagated along inductor wires and, thus, an inductive discharge was formed to create a population inversion by IR transitions of CO2* molecules.

AB - In 2021, data on the effective pulsed gas discharge inductive CO2 laser with radio-frequency (RF) excitation were published with a pulse output energy of E∼ 1 J (the efficiency η∼ 14.5%) on the gas mixture He:N2:CO2 = 8:2:1. The efficiency of the developed CO2 laser had exceeded the value η∼ 21% at E∼ 350 mJ. At the beginning of 2022, it was shown that xenon addition (Xe = 4%) to the gas mixture made it possible to achieve an efficiency of η∼ 27% at an output energy of E∼ 600 mJ. For the first time, the effect of hydrogen additives in the active medium (He:N2:CO2:H2 and N2:CO2:H2 gas mixtures) was investigated for a pulsed inductive CO2 laser with RF excitation depending on the RF-pumping pulse duration value (τ), which allows the energy and temporal radiation characteristics of the laser to be controlled over a wider range. In addition to those already published, new experimental data have been obtained, namely the output beam profile of the inductive CO2 laser based on He:N2:CO2 = 8:2:1 gas mixture depending on the τ value. The new data will improve our understanding of inductive CO2 laser physics and of the plasma-chemical processes occurring in its active medium. RF current pulses propagated along inductor wires and, thus, an inductive discharge was formed to create a population inversion by IR transitions of CO2* molecules.

KW - free running mode

KW - H additives

KW - inductive CO laser

KW - laser beam divergence

KW - pulse duration

KW - pulsed inductive discharge

KW - ‘full mirror’ resonator

UR - http://www.scopus.com/inward/record.url?scp=85144024796&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=50204714

U2 - 10.1088/1555-6611/aca291

DO - 10.1088/1555-6611/aca291

M3 - Article

AN - SCOPUS:85144024796

VL - 33

JO - Laser Physics

JF - Laser Physics

SN - 1054-660X

IS - 1

M1 - 015002

ER -