High power fiber lasers have seen tremendous development in the last decade with output powers exceeding multiple kilowatts from a single fiber. However, to achieve very high power levels, beyond the 10kW level, power combining of multiple fiber laser modules is essential. Such fiber laser modules amenable to power combining have stringent requirements on the linewidth or coherence specifications. There is a fundamental limitation that arises in narrow linewidth, high power lasers due to Stimulated Brillouin scattering (SBS), a nonlinear photon-phonon interaction. A comprehensive understanding of SBS and methods to mitigate it is essential to develop these laser modules. In this talk, we will talk about of recent work on SBS in high power fiber lasers, methods to mitigate it in the systemic level and our development efforts of kW class, polarization maintaining, high coherence fiber laser modules.
V. R. Supradeepa is a tenured assistant professor at the Center for Nano Science and Engineering, Indian Institute of Science, Bangalore. He obtained his undergraduate degree in Engineering Physics from Indian Institute of Technology Madras in 2006 and his PhD in Electrical and Computer Engineering from Purdue University, West Lafayette in 2011. His PhD thesis advised by Prof Andrew Weiner, was on generation, manipulation and characterization techniques for high complexity optical waveforms and on applications enabled by their unique properties. Subsequently, he worked at OFS laboratories, Somerset, New Jersey from 2011 to 2014 as a principal investigator where he worked on high power fiber lasers and amplifiers. His research interests include nonlinear photonics, high power lasers, integrated photonics, ultrafast optics and optical Communications. He has been an adjunct faculty in the department of electrical engineering at the Indian Institute of Technology Madras since 2017. He was an honorary fellow at the National Tsinghua University Taiwan in the year 2017. He has been awarded faculty fellowships by the ministry of electronics and information technology and the ministry of science and technology, government of India. In 2018, he was elected as an associate to the Indian Academy of Sciences. In 2019, he was awarded the young scientist award from INSA and the young engineer award by INAE. From 2015, he is serving as an associate editor of Optics Express published by the Optical Society of America. He serves on the technical committees of multiple international lasers conferences including OSA Advanced Solid State Lasers and the SPIE Photonics West. He has been the author or co-author of over 120 peer reviewed journal and conference publications.