Maximizing the efficiency of a compact helium-free TEA CO2 laser: Experimental results and theoretical simulation

Kumar, Manoj; Biswas, Abhik K.; Biswas, Tanmoy; Joshi, J. C.; Rana, Lokesh; Yadav, Ravi; Kaul, R.

doi:10.1016/j.optlastec.2019.105764

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…An efficient pump laser with the desired wavelength without wavelength conversion would be a solution. Carbon dioxide (CO 2 ) lasers are known for their large plug-in efficiency 22 , and very recently, the production of only 2.0 ps long pulses with as large as 10 J energy at around 10 μm has been demonstrated 23 . Furthermore, the numerical simulation predicts that in the presence of anomalous dispersion caused by selecting an appropriate isotope of CO 2 gas, self-compression of a few ps duration pulses shorter than 0.5 ps is possible in CO 2 -filled cells 24 .…”

Section: Introductionmentioning

confidence: 99%

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Tóth,

Illés,

Nazymbekov

et al. 2024

Sci Rep

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In the last decade, intense research has been witnessed on developing compact, terahertz (THz) driven electron accelerators, producing electrons with a sub-MeV—few tens of MeV energy. Such economical devices could be used in scientific and material research and medical treatments. However, until now, the extremely high-energy THz pulses needed by the THz counterparts of the microwave accelerators were generated by optical rectification (OR) of ultrafast Ti:sapphire or Yb laser pulses. These lasers, however, are not very effective. Because of this, we use numerical simulations to investigate the possibility of generating high-energy THz pulses by the OR of pulses produced by CO2 lasers, which can have high plug-in efficiency. The results obtained supposing optical rectification (OR) in GaAs demonstrate that consideration of the self-phase-modulation (SPM) and the second-harmonic-generation (SHG) processes is indispensable in the design of CO2 laser-based THz sources. More interestingly, although these two processes hinder achieving high laser-to-THz conversion efficiency, they can still surpass the 1.5% value, ensuring high system efficiency and making the CO2 laser OR system a promising THz source. Our finding also has important implications for other middle-infrared laser-pumped OR-based THz sources.

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Section: Introductionmentioning

confidence: 99%

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Tóth,

Illés,

Nazymbekov

et al. 2024

Sci Rep

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“…The development of a He-free CO 2 laser is thus important. He-free TE CO 2 lasers that operate at repetition rates up to 100 Hz have been reported [20][21][22][23][24]. In the paper reporting 100 Hz operation, a pair of cylindrical electrodes had a length of 80 mm, a width of 15 mm and a discharge gap of 3 mm [20].…”

Section: Introductionmentioning

confidence: 99%

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

Miyagawa,

Uno,

Watarai

et al. 2024

Appl. Phys. B

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The gain characteristics of a CO2 laser pumped by a longitudinal pulsed discharge were investigated to develop a compact He-free CO2 laser operating at a high repetition rate. The longitudinal discharge tube had an inner diameter of 0.8 cm and a length of 45 cm. High-voltage pulses with a discharge starting voltage of 13.4–30.2 kV at a rise time of about 321 ns were applied to the discharge tube. CO2/N2 mixture gas with mixing ratios of 1:0, 1:1, 1:2 and 1:3 was used. The small signal gain coefficient was measured by inputting a seed CO2 laser pulse into the longitudinal discharge tube. The small signal gain coefficient depended on the delay time between the start of the discharge in the longitudinal discharge tube and the input of a seed CO2 laser pulse, the gas mixing ratio, the gas pressure, the repetition rate and the input energy to the longitudinal discharge tube. In this work, in He-free gas, the maximum small signal gain coefficient at a repetition rate of 300 Hz was 2.11%/cm with a delay time of 30.4 μs, a CO2/N2 gas mixing ratio of 1:2, a gas pressure of 2.6 kPa and an input energy of 191 mJ.

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“…The corona discharge then propagates in the extremely high and nonuniform field in the vicinity of the electrode onto and across the surface. Unlike sparks, corona discharge emits UV radiation that is nearly monochromatic in a frequency region below the CO 2 dissociation level where the gas has low absorption [19]. Besides, corona pre-ionization is simple to implement and does not sputter like spark array pins, thus reducing debris coatings in the discharge chamber.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, corona pre-ionization is simple to implement and does not sputter like spark array pins, thus reducing debris coatings in the discharge chamber. Although several corona pre-ionized TEA CO 2 lasers have been reported [12,[19][20][21][22], a comparative performance study of the same laser system pre-ionized with spark arrays has not been fully carried out.…”

Section: Introductionmentioning

confidence: 99%

Performance of a surface corona preionized mini-TEA CO₂ laser

Kyeyune¹,

Rohwer²,

Bergmann³

2021

Laser Phys.

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A surface-wire corona preionized miniature transversely excited atmospheric CO 2 laser was evaluated. The corona pre-ionizer was constructed from alumina (Al 2 O 3 ) ceramic tube and a fine wire stretched along the surface of the tube. When this extremely efficient yet comparatively inexpensive pre-ionizer was applied to the laser, output pulse energy of 230 mJ with a pulse duration of ∼70 ns (FWHM) was obtained from a small discharge volume of 50 cm 3 . This energy output was found to be higher than that obtained from a spark preionized laser with the same discharge volume. Moreover, the discharge stability was also found to improve drastically. These results can therefore be used as a reference when developing full-scale corona pre-ionized laser systems.

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Maximizing the efficiency of a compact helium-free TEA CO2 laser: Experimental results and theoretical simulation

Cited by 7 publications

References 39 publications

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

Performance of a surface corona preionized mini-TEA CO₂ laser

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Maximizing the efficiency of a compact helium-free TEA CO2 laser: Experimental results and theoretical simulation

Cited by 7 publications

References 39 publications

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Possibility of CO2 laser-pumped multi-millijoule-level ultrafast pulse terahertz sources

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

Performance of a surface corona preionized mini-TEA CO2 laser

Contact Info

Product

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Performance of a surface corona preionized mini-TEA CO₂ laser