influence of the inner diameters of capillary on the output of neon-argon 69.8nm laser pumped by capillary discharge

This article explores the impact of capillary inner diameter on the output of neon-argon 69.8 nm laser pumped by capillary discharge. By utilizing capillaries of different inner diameters and 35 cm length, in combination with adjustments to the working gas pressure of Ar, pre-pulse amplitude, and pre-main pulse delay under high main pulse current amplitudes, the influence of experimental parameters on neon-argon 69.8 nm laser was researched. The experimental results emphasize the critical role of capillary inner diameter in achieving the plasma state required for 69.8 nm laser output. With the 3 mm inner diameter capillary, the higher amplitude 69.8 nm laser can be generated. Additionally, the temporal characteristics of a 69.8 nm laser were investigated, and the laser pulse duration was measured as full width at half maximum (FWHM) of 1.9 ns under optimal conditions. Furthermore, the corresponding gain coefficient measurements conducted under the optimal conditions gain saturation can be realized at a length of 32 cm, with a gain-length product of 15. The gain coefficient of $0.47 \mathrm{~cm}^{-1}$ represents the highest reported in the existing literature for the 69.8 nm laser. These outcomes provide a significant experimental foundation to the enhancement of the performances of capillary discharge neon-argon 69.8 nm lasers.