Iraqi Laser Society Journal

The increasing applications for modern optical fibers present significant challenges to the material properties and the processing technology of fiber optics. These types of optical fibers had many applications in optical fiber communication system and sensing devices. This work studied the transmission properties of core-doped single-mode fiber with different materials doping. Two doping materials were used, germanium and thallium, with different communication link lengths (1 and 15) meters. This work studied Full Width of Half Maximum (FWHM) and dispersion. The results clearly show that the doping material decreases the broadening of the Gaussian propagation pulse and thus decreases dispersion. This influence was more apparent in optical fibers doped with thallium than germanium.

Simple or multiple linear regression models contain three elements, each of which is variables, constants, and residuals. Among the common and commonly used constants in this model is the constant term or the intercept parameter, which is symbolized by the symbol . Due to the importance of the intercept parameter, we study and identify this parameter by using the preliminary test estimator to estimate the intercept parameter based on the Bayesian estimate, and showing the amount of bias (Bias) and the mean square error (MSE) of the estimator of the initial test of the intercept parameter. Then compare it with the least squares (OLS) method to demonstrate the efficiency of estimating the initial test. The MATLAB program will be added to solve the equations.

This research addresses the significant importance of medicinal herbs, highlighting their role as non-traditional crops. It explores the role of phytochemicals in various industries, including pharmaceuticals and food, as preservatives, flavorings, and more. Specifically, the research focuses on the use of ATR-FTIR and laser spectroscopy to analyze their active compounds, presenting a methodology with potential applications for ensuring the quality of medicinal plant products. In this study, three medicinal herbs (Calligonum comosum, Caper oleoresinus, and Purslane) were investigated using infrared and laser spectroscopy. The aim was to study these important species and determine their properties and composition. To achieve this, a semiconductor laser with a wavelength of 805 nm and a fast detector were used to measure the intensity and energy of the radiation. The spectral results showed clear intensity peaks in the 10,000–15,000 cm⁻¹ range for the laser, and the infrared spectroscopy results showed strong absorption peaks indicating the active regions of the herbs. The importance of this research lies in the wide medical benefits of these herbs for improving the health of humans, as well as animals and other plants, as well as for preserving them and establishing reserves in their natural environment to benefit from scientific means, including lasers and spectral methods, in sustainable development.