1. APOS Conference, Sydney Australia (2012)

2. JSAP-OSA Conference  Japan            (2013)

3. Advanced Photonics Conference Barcelona Spain (2014)

4. FIO  Conference , Tuson Arizona , USA (2014)

5. Invited talk, Deen Dayal Uppadhaya Gorakhpur University

6. ACP Conference , Hongkong, (2015)

8. Invited Talk Baylor University . USA (2016)

9. Invited Talk A & M University , College Station , USA (2017).

10. APOS Conference, Dallas (2017)

11. IIT Jodhpur (2019)

12. IIT Dharwad (2019)

13. BITS Pilani (2019)

14. IISER Behrampur (2019)