Small signal gain coefficient in Ar X-ray lasers using geometrically dependent gain coefficient

4^th International Conference on Photonics & Laser Technology

July 28-29, 2016 Berlin, Germany

Akbar Hariri

Nuclear Science and Technology Research Institute, Iran

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

The model of the geometrically dependent gain coefficient (GDGC) along with the reported amplified spontaneous emission (ASE) experimental measurements for the intensity and line-width in Ar X-ray lasers at 46.9 nm are used to calculated the behavior of the gain coefficient and line-width with respect to capillary discharge length. It is shown that by deducing gain parameters from measurements of the ASE intensity vs. excitation length, the unsaturated and saturated gain coefficients for a given excitation length can be obtained. According to our calculation a general plot of gain coefficient with respect to excitation length, corresponding to 13 different experimental measurements, reported from different laboratories is introduced, where the plot confirms the validity of the GDGC model to be applied for Ar X-ray lasers and also for unifying these lasers. For a typical recent experimental observation for i=21 kA and Ar gas pressure of 440 mTorr the intrinsic Voigt profile line-width is calculated to be 55.67 mÃ?Â? which is very close to Doppler line-width of 53.52 mÃ?Â?. In addition, a summery of the past experimental observations and measurements for this laser is introduced. Details for the analytical and numerical calculations for the gain coefficient and line-width versus excitation length will be also given.

Biography :

Email: akbar_hariri@yahoo.com