16 February 2018 Longitudinally excited CO2 laser with short laser pulse and high quality beam
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Abstract
We developed a longitudinally excited CO2 laser with a tail-free short pulse and a high quality beam. The laser system had a longitudinal discharge tube, a long optical cavity and a simple driver circuit. The discharge tube was made of an alumina ceramic pipe with an inner diameter of 16 mm and a length of 45 cm, two metallic electrodes and two windows. Gas medium was a 20:1 mixture of CO2/N2 at a pressure of 2.6 kPa. The optical cavity with the length of 180 cm was formed by an output coupler with a reflectivity of 70% and a high-reflection mirror. The optical cavity had an aperture or did not. The driver circuit consisted of −600 V pulse power supply and a primary capacitance of 9.6 μF, a step-up transformer, a storage capacitance of 700 pF, a spark gap and the discharge tube. The CO2 laser produced a tail-free short pulse with the width of 281 ns. The CO2 laser beam was a ununifomly distributed circular beam with the M2 factor of 22.8 in the laser system without an aperture, a top-hat shape of circular beam with the M2 factor of 9.61 in the laser system with a φ11-mm aperture, 5.40 in the laser system with a φ9-mm aperture, or a Gaussian shape of circular beam with the M2 factor of 3.01 in the laser system with a φ7-mm aperture.
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Kazuyuki Uno, Jianhui Li, Hayato Goto, Takahisa Jitsuno, "Longitudinally excited CO2 laser with short laser pulse and high quality beam", Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 105181Y (16 February 2018); doi: 10.1117/12.2288071; https://doi.org/10.1117/12.2288071
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