1. Centre for Lasers and Photonics, IIT Kanpur, Kanpur, India
2. Department of Physics, Stockholm University, Stockholm, Sweden
3. Department of Physics and Centre for Lasers and Photonics, IIT Kanpur, Kanpur, India
4. Department of Electrical Engineering, IIT Kanpur, Kanpur, India
5. Department of Mechanical Engineering, IIT Kanpur, Kanpur, India
6. CSIR-CSIO, Chandigarh, India