Laser and Optoelectronic Engineering Department of Technology-Iraq;
Department of Civil Engineering of Engineering University-Erbil Region;
Department of Petroleum and Gas Refinery Engineering-Farabi University Collage;
Applied Science Department of Technology-Iraq;
Department of Medical Physics-Mustaqbal University College;
Institute of Nano Electronic Engineering Malaysia Perlis;
Gallium nitride; porous silicon; photoelectrochemical etching; pulsed laser deposition; optical device;