Analysis of amplified spontaneous emission intensity: A generalized formula

4^th International Conference on Photonics & Laser Technology

July 28-29, 2016 Berlin, Germany

G Ghani Moghadam

Amirkabir University of Technology, Iran
Nuclear Science &Technology Research Institute, Iran

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

The very high gain laser active media that are used for mirrorless lasers such as soft X-ray lasers have quite high gain and amplified spontaneous emission is the base of mechanism. Therefore, the calculation of ASE intensity is very important and is possible by the numerical solution of the radiation transport equation for the active medium. In low intensities, the Linford approximation has been used that is not valid in high intensities. In this paper, we have used the numerical solution of the rate equation and the Linford equation and by fitting data offered a general formula for both low and high intensities to calculate the ASE intensity. This formula present the ASE intensity for different solid angles and for both homogeneously and inhomogeneously broadened line. The results compared with the corrected Linford formula in low intensities andasymptotic limiting formula for the high gain saturation. Therefore, a general formula is proposed for calculating the intensity of amplified spontaneous emission (ASE) both in low, medium and high intensity regimes for both homogeneous and inhomogeneous line broadening. An error analysis over the entire region of the gain length product is also given.It is seen that the error of this formula respect to numerical solutionis accurate enough for practical purposes.

Biography :

Email: ghanimoghadam@yahoo.com