A powerful transversely excited multigas laser system

Self-heterodyne mixing method of two inter-mode beat frequencies for frequency stabilization of a three-mode He-Ne laser AIP Advances 2, 022170 (2012) Experimental investigation on focusing characteristics of a He-Ne laser using circular Fresnel zone plate for highprecision alignment of linear accelerators Rev. Sci. Instrum. 83, 053301 (2012) Study of laser plasma emission from doped targets Rev. Sci. Instrum. 83, 02B911 (2012) Analysis of temporal jitter in a copper vapor laser system Rev. Sci. Instrum. 83, 025105 (2012) Measurements and imaging of optical gain in optically pumped alkali-rare gas systems Appl. Phys. Lett. 100, 041110 (2012) Additional information on Rev. Sci. Instrum.Pulsed transverse electric (TE) glow discharges used to produce population inversions in gas lasers at l-20 atm require high-speed, high-voltage, high-current capacitor banks. In this article we first review and compare the circuits in common use to produce the required fast, self-sustained glow discharges in CO*, excimer, and N2 lasers. The parameters and circuit types given will be useful to future designers of pulsed gas lasers to design and to optimize any proposed circuit in order to yield any desired operating conditions and parameters. The n-stage circuit types presented are capacitor-transfer (C-C), L-C inversion, Marx bank, 'and fourfold L-C inversion, with their double-sided counterparts, and also their transmission-line counterparts, such as the Blumlein circuit. A one-parameter differential equation is developed which describes the general series C-L-R circuit. Electrical pulses measured on various lasers are compared with the differential equation solutions for various bank impedances and load resistances. We then present the design and measurements of a new automatically preionized, double-sided, L-C inversion circuit for an 8OO-mJ, TE CO2 laser, and compare it to previous systems. Methods to lengthen the discharge pulse, and some novel active mode locking techniques are discussed. We compare the L-C inversion circuit, the fourfold L-C inversion circuit, the conventional Marx bank, and the "double Marx bank" for lasers and other applications, such as pulsed particle accelerators. Finally, we discuss capacitor bank interconnections, electro-optic probe systems, and various triggering methods.

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Hot carrier photovoltaic effect induced by 10.6 μm laser radiation in Ge and PAsGa junctions

Encinas‐Sanz¹,

Pérez²

1993

Journal of Applied Physics

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The observation of CO2 (10.6 μm wavelength) laser-induced photoeffects in Ge and PAsGa junctions is reported. A moderately nonlinear low laser excitation intensity regime and a strongly nonlinear high laser excitation intensity behavior are observer in Ge junctions as was previously reported in Si junctions. Two strongly nonlinear behaviors are observed in PAsGa junctions. A opposite sign prepulse is also observed as in Si junctions. The observation of the same photoeffects in three different materials is proof of the universal character of the studied phenomenon. A interpretation on the basis of a hot carrier plasma model is discussed.

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A powerful transversely excited multigas laser system

Cited by 7 publications

References 18 publications

Investigation of gas chemistry in the sealed TEA CO2 laser

Investigation of gas chemistry in the sealed TEA CO2 laser

High-speed circuits for TE discharge lasers and high-voltage applications

Hot carrier photovoltaic effect induced by 10.6 μm laser radiation in Ge and PAsGa junctions

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