Abstract
A continuous point-like laser discharge of record high temperature has been produced in argon at atmospheric pressure with focusing of the radiation of the Novosibirsk terahertz free electron laser (NovoFEL). According to spectral measurements, the temperature in the center of the millimeter-sized plasma sphere was 28000 K at a plasma density of 1.5×1017 cm-3 and an average NovoFEL power of 200 W at a wavelength of 130 μm (2.3 THz).
Highlights
The laser optical discharge is a specific type of gas discharge with a temperature 2-3 times higher than that in other discharges, which makes it of great interest both for fundamental science and many practical applications.[1]
In this paper we describe a millimeter-sized laser discharge at atmospheric pressure in the terahertz range, which is optimal for such discharge parameters
At parameters typical of plasma laser discharges, a decisive contribution to the continuum is provided by the recombination radiation.[1]
Summary
The laser optical discharge is a specific type of gas discharge with a temperature 2-3 times higher than that in other discharges, which makes it of great interest both for fundamental science and many practical applications.[1] The pulsed laser discharge was first obtained in the optical range using a Q-switched ruby laser.[2] The appearance of high-power infrared CO2 lasers launched intense study of the continuous laser optical discharge.[1] Currently, the applications of the laser discharge are very diverse These are various laser-plasma technologies for surface modification and creation of various coatings, as well as non-contact laser switching in high-voltage systems. The continuous point-like high-temperature laser discharge is very useful in spectroscopy as a source of broad-band radiation and as plasma medium for excitation of multicharged ions. The discharge has a record high temperature and good efficiency
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