Nahlah Mohammed

• Professor
• Research Director at Salahaddin University-Erbil

Second Harmonic Generation (SHG) is the process of doubling the natural frequency of any laser. Since the output of Nd-YAG lasers has a wavelength of , it is the aim of this research to produce an SHM diode pumped of this laser with a wavelength of. This work is done via manipulating a few equations to produce the best results for both circulating...

In this paper, we present the experimental evidence of chaos generation, modulation by means of opto electronic feedback of semiconductor laser. The output photo current of the pin photo diode is amplified and re-injected as a feedback to the semiconductor laser. The injected feedback photo current produce chaotic laser output, the chaos distributi...

A Radio-over-Fiber (RoF) makes use of the advantages of wireless communication system and optical networks. It uses optical fiber as a core technology due to the enormous advantages offered by it. Making use of mobility available by wireless communication. Dispersion management and modulation were investigated for two Channel-WDM optical communicat...

True random number generators are essential components for communications to be confidentially secured. In this paper a new method is proposed to generate random sequences of numbers based on the difference of the arrival times of photons detected in a coincidence window between two single-photon counting modules.

It is the aim of this project to study the ability of producing second harmonic generation for a (10 mW) He-Ne laser and to test some optical properties for KDP crystal and to compare the results with those obtained in testing the same crystal with using a (18 mW) Laser Tube. It seems that the performance of visible radiation is more accurate rathe...

We study theoretically and experimentally the properties of numerical aperture (𝑁𝐴) of multimode graded-index plastic core silica (PCS) fibers by using an image technique. A He-Ne laser at wavelength 632.8nm and output power 1mW is used as the transmitter light source. The output beam images and intensity profiles of an optical fiber are investigat...

Radon alpha activity concentration has been measured in 28 homes in the Erbil Capital-Iraqi Kurdistan region during the autumn season by using time-integrated passive radon dosimeters containing CR-39 solid state nuclear track detectors “SSNTDs”. The radon activity concentrations in these homes range from (10.33–90.34) Bqm-3 with an average of 44±2...