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Acknowledgments

The authors express their sincere gratitude to all who made this book possible in one of the most turbulent times in decades. Firstly, thanks to Dr. Nim K Cheung, IEEE Series Editor for inviting us to write a book on VCSELs in November 2019. Secondly, to the IEEE Press and Wiley Publishing staff, especially to Ms. Mary Hatcher and Ms. Teresa Netzler for their support in accepting our regular book proposal on July 2020 from multiple authors for a VCSEL industry reference that initially started as a short e‐book! We thank all the reviewers of the proposal and manuscript production stages; without their timely support, the authors could not have completed this book in such a short period of time. The authors also sincerely thank all of the image contributors (companies and professional societies listed in page xxv, 311–312) in this book for their copyright permissions.

The authors would also like to thank the many co‐workers, students, and colleagues that we have worked with over the years. We have learned a lot about VCSELs and especially have learned that these are one of the most complicated two‐terminal devices ever manufactured. Writing this book has reinforced the breadth and depth of understanding needed in multi‐disciplinary physics to design and manufacture VCSELs. They encompass aspects of mechanical, electrical, thermal, optical and solid‐state physics are truly remarkable devices. Along with the technical challenges, the realization of market forces, the drive of standardization, and the necessity of meeting commercial objectives have been an amazing journey for all of us. The advances in so many interdisciplinary aspects of engineering have enabled more than 1 billion devices manufactured since its invention in 1977.

Babu Dayal is delighted and thankful for a unique and lifetime opportunity to work with the world’s pioneering research group with a host of groundbreaking studies in optical communication and semiconductor lasers at Tokyo Institute of Technology (Tokyo Tech.), Japan, led by the renowned Professor Emeritus Yasuharu Suematsu and would like to express sincere thanks to the following:

 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.

Jim Tatum would like to thank the following for their contributions to his professional and personal development:

 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.

Kenichi Iga would like to express thanks to the following people:

 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.