The study of capillary discharge Ne-like 46.9 nm laser with a 2.5 mm inner diameter capillary

The capillary discharge 46.9 nm laser experiment was conducted using an alumina capillary of 35 cm in length and 2.5 mm in inner diameter. In terms of temporal characteristics, the duration (FWHM) of the laser pulse is 1.6 ns. The laser energy obtained with the 2.5 mm diameter capillary can be up to 1 mJ. For comparison, the laser energy achieved with the commonly used 3.2 mm diameter capillary is 305 μJ. With regard to spatial properties, the laser spot obtained at the optimal pressure using the 2.5 mm diameter capillary has a spatial distribution that is Gaussian-like, and the divergence's FWHM is 0.61 mrad. In order to investigate the effect of the capillary inner diameter on the 46.9 nm laser, we computed the plasma column characteristics near the lasing times observed with the 2.5 mm and 3.2 mm diameter capillaries.