Abstract
The dynamic behaviour of a CO 2 laser subject to modulation of its operational parameters is studied using an internally consistent formulation of the well-known reservoir equations [K. Smith, R.M, Thomson, Computer modeling for gas lasers, Plenum, New York, 1978]. The use of practically inaccessible physical quantities is avoided leading to a transparent set of equations describing the main properties of the temporal behaviour of the laser. The model is then applied to a variety of operational modes of the laser ranging from CW lasing to cavity dumping using a resonant reflector. In all these cases, and despite the simplifications made to render the problem tractable for desktop computation, realistic results are obtained for such practically relevant quantities as electro-optic conversion efficiency (CW), peak power ( Q-switched), pulse repetition rate and duty cycle limitations (electrically pulsed) among others. This leads us to believe that the formulation of the equations given — based on extensive experimental and theoretical experience summarised in [S. Sazhin, P. Wild, C. Leys, D. Toebaert, E. Sazhina, J. Phys. D 26 (1993) 1872–1883; S. Sazhin, P. Wild, E. Sazhina, M. Makhlouf, C. Leys, D. Toebaert, J. Phys. D 27 (1994) 464–469; M. Spiridonov, C. Leys, D. Toebaert, S. Sazhin, E. Desoppere, P. Wild, S.M.P. McKenna-Lawlor, J. Phys. D 27 (1994) 962–969; D. Toebaert, P. Muys, E. Desoppere, IEEE J. Quantum Electron. 31 *10) (1995) 1774–1778; D. Toebaert, P. Muys, E. Desoppere, J. Phys. D 29 (7) (1996) 1910–1916.] — grasps the overall kinetics of the molecular discharge and can be reliably used to at least predict upper limits to the laser's performance.
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