1. Central Research Facility, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
2. Department of Physics, St. Xavier's College, Ranchi 834001, Jharkhand, India
3. Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India