Vol. 39, issue 04, article # 10

Abstract:

The development of laser radiation sources in the yellow-red spectral region with an extended range of adjustable generation parameters is a relevant and sought-after task in biomedical applications. This work experimentally studies spectral, temporal, spatial, and energy characteristics of neon atom radiation excited by a pulsed inductive cylindrical discharge. Lasing was obtained at 3p → 3s transitions of neutral neon atoms with wavelengths of 594.4 nm and 614.3 nm. The intensity ratio of these spectral components I₅₉₄ : I₆₁₄ depended on the pumping conditions and varied from 1 : 1 at pressures of 0.2–0.3 torr to 1 : (2¼4) at an optimal pressure of about 0.13 torr. A maximal lasing energy of 17 mJ was achieved at a charging voltage of 29 kV (limited by the excitation system characteristics). A decrease in charging voltage below 20 kV resulted in the breakdown of lasing. The study of the temporal lasing characteristics revealed that lasing at the both wavelengths began simultaneously. The pulse duration was identical and attained an average of 12.5 ± 0.5 ns (FWHM), which corresponded to a pulse power of over 1.4 kW. These results can be used to develop gas-discharge lasers with tunable radiation parameters for ophthalmic applications.

Keywords:

pulsed inductive discharge, electrodeless low pressure discharge, pulse power, management of plasma parameters

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