VCSEL Industry. Babu Dayal Padullaparthi

       Professor Fumio Koyama from Tokyo Tech. for his gentle and generous support (then at the Microsystems Research Center in the Precision & Intelligence Laboratories) during 2005–2009 and advice during industry tenures (2011–2020). Professor Koyama kindly introduced me to the exciting world of VCSELs and its community that led to my continued professional journey in academics and industry.

       Esteemed co‐authors of this book, Professor Emeritus Kenichi Iga (none other than the inventor of VCSEL in 1977 from Tokyo Tech.) and Dr. Jim A Tatum (industry veteran, formerly from Honeywell and Finisar from the mid‐1990s) who truly brought academic and industry vigor to this book.

       Professor Kei Mei Lau (HKUST) for introducing me to Dr. Nim K Cheung, who brought up the idea of writing this book. Professor M. R. Shenoy (Department of Physics at IIT Delhi) for his first VCSEL assignment in the “Semiconductor Optoelectronics” OE703N course in 2000, Dr. L. Raghavendra Rao (former HoD Physics at Govt. Autonomous College at Rajahmundry, Andhra University, India), and Dr. Takemasa Tamanuki (formerly at Tokyo Tech. and Senior Researcher at Yokohama National University, Japan) for their motivation with crystal clear concepts. Also, thanks to Prof. B. R. Mehta (IIT Delhi) and Dr. Takeshi Nakamura (formerly from Fuji Xerox and SAE [TDK]) for welcoming me to Nanomaterials R&D in 1999 and the VCSEL Industry in 2011, respectively.

       Dozens of researchers in the semiconductor lasers and VCSEL community formerly from AT&T Bell Labs, in particular the late Dr. Tingye Li, and Dr. T. P. Lee; Professor Yasuharu Suematsu and Professor Kohroh Kobayashi (Tokyo Tech., Japan), and Professor C S Sunandana (formerly at School of Physics, University of Hyderabad, India) for their inspiration and directly kindling the curiosity lamps with energetic sparks. Also special thanks to Professor Dieter Bimberg (TU Berlin, Germany), Professor Connie C Hasnain (UC Berkeley, USA), and Professor Anders Larsson (Chalmers University of Technology, Sweden) for their encouragement during industrial interactions. Thanks also to other co‐workers from Tokyo Tech., SAE, and Sanan.

       Professor V. D. Vankar (IIT Delhi), late Dr. D. V. Sridhara Rao (Scientist G, DMRL, Hyderabad), Mr. G. Bhaskar Rao (Amazon, Vancouver, Canada), Mr. Kalyan G Pratap (TCS, Greater Hyderabad), and Mr. K. Pradeep (ProdyoVidhi Consulting, New Delhi) for their support that prompted to work in solid‐state physics and semiconductor optoelectronics device R&D.

       Dr. Luke Graham and Ms. Pritha Khurana for having the courage to start a new VCSEL company together. It is an honor to work with both of you on a daily basis, and you both teach me about the technical and business aspects of VCSELs every day.

       The VCSEL design group at Finisar, especially Jim Guenter, Ralph Johnson, Bob Biard, Gary Landry, Petter Westbergh, Deepa Gazula, Wenjuan Fan, Kent Wade, and Hao Chen, where we made some incredible devices over the years. There are too many others at Finisar to thank personally, but all of you helped!

       Dr. Duncan MacFarlane for taking a chance on a student and teaching me about lasers but more importantly, becoming a true friend, mentor, and role model.

       Professor Yasuharu Suematsu, Honorary Professor at Tokyo Institute of Technology, for his continuous advice.

       Fumio Koyama, Professor of Institute of Innovative Research, Tokyo Institute of Technology, for VCSEL research together.

       Hiroyuki Uenohara, Susumu Kinoshita, Tomoyuki Miyamoto, Nobuhiko Nishiyama, Takahiro Sakaguchi, and Akihiro Matsutani, staff, graduates, and researchers of my laboratory who have been studying together.

       Kohroh Kobayashi, Professor Emeritus of Tokyo Institute of Technology, Akihiko Kasukawa of Furukawa Denko, and Yuichi Tohmori of former NTT and now Tsurugi Photonics Foundation for their encouragement of VCSEL research.

       For all members of the Microoptics Group, Japan Society of Applied Physics, who have been promoting the field of microoptics for 40 years. In particular, Dr. Genichi Hatakoshi, who is the co‐author of Treasure Microbox of Optoelectronics, published from Adcom‐Media Co. Ltd. and my playing buddy of Duo21.

       Dr. Connie Chang‐Hasnain, Professor Emeritus of UC Berkeley, and Dr. Waguih Ishak of Corning R&D Organization for providing the data and having valuable discussions.