Pulsed Inductive IR Ar I laser
- PDF / 497,244 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 90 Downloads / 204 Views
TICAL SOURCES AND RECEIVERS FOR ENVIRONMENTAL STUDIES
Pulsed Inductive IR Ar I laser A. M. Razheva, *, D. S. Churkina, b, **, and R. A. Tkachenkoa, *** a
Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia b Novosibirsk National Research State University, Novosibirsk, 630090 Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] Received January 16, 2020; revised January 16, 2020; accepted January 23, 2020
Abstract—The results of experimental studies of the effect of pumping conditions on the spectral and temporal characteristics of IR Ar I laser radiation under excitation of the active medium by longitudinal pulsed inductive discharge are presented. The lasing was obtained at transitions of neutral argon atoms at wavelengths of 1213, 1240, 1270, 1694, and 1791 nm in pure argon and in its two-component mixtures with helium and neon. The optical pulse length at half maximum was (5 ± 1) ns. The radiation energy attained 0.1 mJ. Keywords: pulsed longitudinal inductive discharge, IR Ar I laser, generation spectrum, pulse length DOI: 10.1134/S1024856020040119
INTRODUCTION The problem of technogenic pollution is currently of growing importance. Therefore, the study of a possibility of designing relatively simple small-size IR and mid-IR lasers is urgent. The great interest in these spectral regions is due to the existence of Earth’s atmospheric windows, which allow remote diagnostics of the absorption and scattering spectra of regions of the sky in order to detect various toxic and polluting compounds. In addition, these sources can be used in medicine, including surgery, and in technologies for creating wireless optical communication due to weaker scattering in the atmosphere as compared to UV and visible radiation [1–5]. However, despite the recent progress in solid-state tunable IR lasers, the work on their creation and implementation is still far from completion, and their high cost significantly limits their applicability. In view of this, IR lasers based on transitions of neutral argon atoms can be suggested as one of alternative radiation sources in this wavelength region, since its strongest lines belong to the range from 1 to 3 μm and fall into the corresponding atmospheric windows. Different techniques were used for pumping the active medium of Ar I lasers since their invention. For example, nuclear pumping made it possible to create quasi-continuous argon lasers with a maximum continuous power of 390 W and an efficiency of up to 0.6% [6, 7]. The electron-beam pumping of highpressure argon mixtures, such as He(He + Ne) : Ar (100 : 1) provides for currently maximal lasing energy
characteristics, namely, a pulsed power of 0.5–4 MW at an energy of 4.3 J and a laser efficiency of 2% [8, 9]. Despite this, the most suitable method for exciting argon in practical applications is pumping with a longitudinal or transverse high-current pulsed electric discharge. Mixtures He(Ne) : Ar (usually 100 : 1, at pressures from 3–5 T
Data Loading...
