{"title":"High-repetition-rate operation of LE CO2 laser without Helium or pre-ionization","authors":"Ryo Okawa, Kazuyuki Uno, Shohei Watarai, Yasushi Kodama","doi":"10.1007/s00340-025-08408-z","DOIUrl":null,"url":null,"abstract":"<div><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 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 CO<sub>2</sub>/N<sub>2</sub> 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.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 3","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00340-025-08408-z.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics B","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s00340-025-08408-z","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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Features publication of experimental and theoretical investigations in applied physics
Offers invited reviews in addition to regular papers
Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more
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Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field.
In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.
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