Study of the Effect of N2 Gas Purity and the Length of Active Medium on Laser  Parameters in an Oscillator-Amplifier N2-Laser System

Rahimian, K; Ghoreyshi, S; Hariri, A

Study of the Effect of N2 Gas Purity and the Length of Active Medium on Laser Parameters in an Oscillator-Amplifier N2-Laser System

Document Type : Research Paper

Authors

K Rahimian

S Ghoreyshi

A Hariri

Abstract

In an Oscillator-amplifier N₂-laser system of the type TE-TE with the amplifier active effective length of 31 cm, both operating with corona-preionizer, the gain coefficient (g₀) and saturation energy density (E_s) measurements have been carried out for different gas pressures and gas purities. The details of our measurements are tabulated or presented graphically. The obtained values for the cases of used or cleaned electrodes are also presented for the comparison. At last, our g₀ values along with those of our previously reported values for the active length of 94 cm and other reported values for the active lengths of 45 and 50 cm have been introduced for the comparison, and it was found that the measured values of g₀ follow a characteristic curve showing their strong dependency on the length of laser channels. The present observation indicated that while the length of laser channel has the major contribution to the g₀ values, the contributions of gas purities and cleaned electrodes are limited to at most 19.4% and 1.9%, respectively, at the gas pressure of 100 Torr.

Highlights

A. Hariri, M. Tarkashvand, F. Ardavani, A. A. Yaraghchi, “Experimental investigation of the TE (Transversely Excited) N₂-Laser”, Scien. Bull. of the AEOI, 3 , 62-79 (1983).
A. Hariri, M. Tarkashvand, A. Karami, “Uniform glow discharges for nano-second excitation of TEA and TE N₂ laser”, Procedings of National Conference on Lasers and Their Applications, 12-16, Sep. (1987), Tehran, Iran, edited: A. Hariri.
A. Hariri, S.A. Golpayegani, M. Nayeri, “Long pulse operation of a longitudinally discharge-pumped N₂-laser”, Sci. Bull. Of AEOI, 9 , 33-41 (1989).
A. Hariri, M.Tarkashvand, A. Karami, “Corona-preionized nitrogen laser with variable pulse- width”, Rev. Sci. Instrum. 61 , 1408-1412 (1990).
S. Ghoreyshi, A. H. Farahbod, A. Hariri, “Experimental investigation of self-filtering unstable resonator in a longitudinally excited nitrogen laser”, J. of Nuclear Sci. and Tech. 25 , 1-8 (2002).
A. Hariri, M. Tarkashvand, A. H. Farahbod, “Experimental study of an oscillator-amplifier transversely excited nitrogen laser”, J. of Nuclear Sci. and Tech. 29 , 17-24, (2003).
S. Ghoreyshi, K. Rahimian, A. Hariri, “Double-pass amplification in a longitudinally excited low pressure N₂-laser”, Proceedings of International Conference on Physics 427-432, January 6-9 (2004) Tehran, Iran.
S. Ghoreyshi, K. Rahimian, A. Hariri, “Gain and saturation energy measurements in low pressure, longitudinally excited N₂-laser”, Opt. Commun. 238 , 139-149 (2004).
F. Docchio, V. Magni, R. Ramponi, “Thyratron-switched N₂ atmospheric-pressure oscillator, low pressure amplifier laser system”, Rev. Sci. Instrum. 55 , 477-481 (1984).
A. A. Serafetinides, G. N. Tsikrikas, “A semiconductively preionised TEA nitrogen oscillator-amplifier laser system”, Opt. Commun. 79 , 448-454 (1990).
L. M. Frantz, J. S. Nodivk, “Theory of pulse propagation in a laser amplifier”, J. Appl. Phys. 34 , 2346-2348 (1963).
J. Banic, T. Efthimiopoulos, B. P. Stoicheff, “Gain and saturation intensity measurements of mode-locked KrF oscillator-amplifier”, Appl. Phys. Lett. 37 , 686-688 (1980).
T. Jitsuno, “A multi-stage TEA N₂ laser”, J. Phys. D : Appl. Phys. 13 , 1405-1411 (1980).
T. Jitsuno, “A multi-stage TEA N₂ laser”, J. Phys. D : Appl. Phys. 13 , 1405-1411 (1980).

Keywords

gain and saturation energy measurements

oscillator-amplifier

nitrogen laser

gas purity

corona-preionization

A. Hariri, M. Tarkashvand, F. Ardavani, A. A. Yaraghchi, “Experimental investigation of the TE (Transversely Excited) N₂-Laser”, Scien. Bull. of the AEOI, 3 , 62-79 (1983).
A. Hariri, M. Tarkashvand, A. Karami, “Uniform glow discharges for nano-second excitation of TEA and TE N₂ laser”, Procedings of National Conference on Lasers and Their Applications, 12-16, Sep. (1987), Tehran, Iran, edited: A. Hariri.
A. Hariri, S.A. Golpayegani, M. Nayeri, “Long pulse operation of a longitudinally discharge-pumped N₂-laser”, Sci. Bull. Of AEOI, 9 , 33-41 (1989).
A. Hariri, M.Tarkashvand, A. Karami, “Corona-preionized nitrogen laser with variable pulse- width”, Rev. Sci. Instrum. 61 , 1408-1412 (1990).
S. Ghoreyshi, A. H. Farahbod, A. Hariri, “Experimental investigation of self-filtering unstable resonator in a longitudinally excited nitrogen laser”, J. of Nuclear Sci. and Tech. 25 , 1-8 (2002).
A. Hariri, M. Tarkashvand, A. H. Farahbod, “Experimental study of an oscillator-amplifier transversely excited nitrogen laser”, J. of Nuclear Sci. and Tech. 29 , 17-24, (2003).
S. Ghoreyshi, K. Rahimian, A. Hariri, “Double-pass amplification in a longitudinally excited low pressure N₂-laser”, Proceedings of International Conference on Physics 427-432, January 6-9 (2004) Tehran, Iran.
S. Ghoreyshi, K. Rahimian, A. Hariri, “Gain and saturation energy measurements in low pressure, longitudinally excited N₂-laser”, Opt. Commun. 238 , 139-149 (2004).
F. Docchio, V. Magni, R. Ramponi, “Thyratron-switched N₂ atmospheric-pressure oscillator, low pressure amplifier laser system”, Rev. Sci. Instrum. 55 , 477-481 (1984).
A. A. Serafetinides, G. N. Tsikrikas, “A semiconductively preionised TEA nitrogen oscillator-amplifier laser system”, Opt. Commun. 79 , 448-454 (1990).
L. M. Frantz, J. S. Nodivk, “Theory of pulse propagation in a laser amplifier”, J. Appl. Phys. 34 , 2346-2348 (1963).
J. Banic, T. Efthimiopoulos, B. P. Stoicheff, “Gain and saturation intensity measurements of mode-locked KrF oscillator-amplifier”, Appl. Phys. Lett. 37 , 686-688 (1980).
T. Jitsuno, “A multi-stage TEA N₂ laser”, J. Phys. D : Appl. Phys. 13 , 1405-1411 (1980).
T. Jitsuno, “A multi-stage TEA N₂ laser”, J. Phys. D : Appl. Phys. 13 , 1405-1411 (1980).