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<p>A He-free CO<sub>2</sub> laser excited by a longitudinal pulsed discharge produced short laser pulses at repetition rates up to 700&#xa0;Hz. A discharge tube with an inner diameter of 8 to 16&#xa0;mm and a length of 60 to 80&#xa0;cm was employed, with a fast, high-voltage pulse of approximately 22.0 to 30.3&#xa0;kV and a rise time of 300 ns. No pre-ionization or fast gas flow systems were used. The oscillation characteristics at various repetition rates, gas mixing ratios, gas pressures, input energies, output coupler reflectivities and discharge tube sizes were investigated. A short laser pulse with a tail was produced under all conditions. In the discharge tube with an inner diameter of 8&#xa0;mm and a length of 80&#xa0;cm, a CO<sub>2</sub>/N<sub>2</sub> mixture at a ratio of 1:2 and a wavelength of 10.6&#xa0;μm, the maximum laser output energies were 32.5, 13.1 and 3.27&#xa0;mJ at repetition rates of 300, 500 and 700&#xa0;Hz, respectively.</p>

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High-repetition-rate operation of LE CO2 laser without Helium or pre-ionization

  • 期刊论文

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  • 发表日期：

    2025年2月14日

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  • Ryo Okawa,
  • Kazuyuki Uno,
  • Shohei Watarai,
  • Yasushi Kodama

摘要

A He-free CO2 laser excited by a longitudinal pulsed discharge produced short laser pulses at repetition rates up to 700 Hz. A discharge tube with an inner diameter of 8 to 16 mm and a length of 60 to 80 cm was employed, with a fast, high-voltage pulse of approximately 22.0 to 30.3 kV and a rise time of 300 ns. No pre-ionization or fast gas flow systems were used. The oscillation characteristics at various repetition rates, gas mixing ratios, gas pressures, input energies, output coupler reflectivities and discharge tube sizes were investigated. A short laser pulse with a tail was produced under all conditions. In the discharge tube with an inner diameter of 8 mm and a length of 80 cm, a CO2/N2 mixture at a ratio of 1:2 and a wavelength of 10.6 μm, the maximum laser output energies were 32.5, 13.1 and 3.27 mJ at repetition rates of 300, 500 and 700 Hz, respectively.