Laser emission spectrum and tuning of the HgCl visible laser

Physics – Optics

Scientific paper

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Chlorides, Emission Spectra, Gas Lasers, Mercury Compounds, Tuning, Visible Spectrum, Broadband, Energy Conversion Efficiency, Frequency Control, Laser Outputs, Line Spectra, Molecular Oscillations, Pulsed Lasers, Stimulated Emission, Volumetric Efficiency

Scientific paper

The laser emission spectrum of the pulsed mercury halide HgCl laser excited in a UV preionized transverse discharge has been investigated. Simultaneous oscillation on many vibrational-rotational lines of the B(2)Sigma 1/2(+)-Chi(2)Sigma 1/2(+) transition has been observed from 533.4 to 565.8 nm. Emission lines from the upper B state are assigned to vibrational levels v-prime = 0 to 12 and to vibrational levels of the lower X state of v-double prime = 18 to 32. A new broadband low gain laser emission overlapping the B-X line emission has been observed. Laser performance has been measured over a wide range of excitation and laser gas conditions; an overall efficiency greater than 0.2% and a volumetric efficiency of 0.75 J/l has been obtained. Tuning characteristics of the laser emission over the range of oscillation frequencies are reported.

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