1. Department of Physics, The Women University, Multan, Multan 66000, Pakistan
2. Department of Physics, King Khalid University, P. O. Box 9032, Abha 61413, Kingdom of Saudi Arabia
3. Department of Metallurgical Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan
4. National Institute of Lasers and Optronics (NILOP) College, PIEAS, Nilore, Islamabad, Pakistan