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Abstract There are many experimental measurements appeared in the literature, where the researchers reported their measured amplified spontaneous emission (ASE) output energies versus medium excitation lengths. In this paper we report on the ASE analyses, made based on using intensity rate equation along with the geometrically dependent gain coefficient (GDGC) model, for different measurements carried out in different laboratories under different experimental conditions. We show that the deduced gain coefficients follow a general equation of g 0 ν° (cm−1) = 0.37 + 11.51/ l AMP , where l AMP is the medium excitation length. For this study at least 13 experimental measurements were analyzed. The method also revealed that we can obtain the behavior of gain coefficient with respect to input current. The optimum operational current is 30 kA, and the calculated intrinsic spectral linewidth for i = 21 kA is 55.67 mÅ. With the GDGC model, consequently, it can be concluded that Ne-like Ar x-ray lasers are unified, and method simplifies greatly the analyses of complicated systems. [ABSTRACT FROM AUTHOR]

By introducing differential amplified spontaneous emission intensity, numerical calculations for both homogeneously and Doppler broadened lines, and using the reported experimental measurements of the amplified spontaneous emission intensity and linewidth, we managed to explain the linewidth behavior, and calculate the intrinsic linewidth due to Voigt-profile width in an argon X-ray laser operating at 440 × 10-3 torr argon pressure and current of 21 kA. For the calculation, the intensity rate equation, along with the model of geometrically dependent gain coefficient were applied. The calculated value of the intrinsic linewidth was found to be 55.67 mÅ, which is very close to the Doppler broadened line of 53.52 mÅ. That is, the collision broadening has a very small contribution to the light-matter interaction in argon X-ray lasers. Details of the procedure used for the calculation will be presented in this paper. [ABSTRACT FROM AUTHOR]

It is shown that a model based on a geometrically dependent gain coefficient (GDGC), which is characterized by gain parameters (m′, , b), introduces a powerful method to describe amplified spontaneous emission (ASE) intensity behavior and its bandwidth reduction when the ASE is propagating along the z-direction. The model also gives correct predictions for unsaturated and saturated gain coefficients and the frequency dependence of the ASE output intensity in a given laser system. For the calculation, the GDGC model in saturated and unsaturated conditions along with the intensity rate equation were applied, and for verification of the model the reported ASE intensity measurements and the measured bandwidth reduction in KrF lasers were utilized. The present model will have applications in any type of pulsed laser system of different active media and different dimensions without going through complicated analysis or utilizing heavy computer numerical computations. Details of the present approach will be given and the excellent agreement with the available and typical experimental measurements for KrF lasers confirms the validity of the proposed GDGC model. [ABSTRACT FROM AUTHOR]