Vijaysekhar Jayaraman

Dr. Jayaraman is the founder of Praevium Research, and principal investigator on all of  Praevium’s research and development efforts.

He received his BS/MS in Electrical Engineering from the Massachusetts Institute of Technology in 1985, and a Ph.D. in Electrical Engineering from University of California, Santa Barbara in 1994. From 1985-1988, Dr. Jayaraman was a staff member at MIT Lincoln Laboratory, where he contributed to the development of a space-based optical heterodyne communication system.

Prior to founding Praevium Research in 2001, Dr. Jayaraman’s work included the first demonstration of the SGDBR tunable laser while a graduate student at UCSB. This device has since been deployed worldwide in commercial wavelength division multiplexing (WDM) networks. Dr. Jayaraman also contributed to the early development of electrically and optically pumped 1300 nm VCSELs while employed at Optical Concepts/W.L Gore and associates and UCSB . At Praevium, he has spearheaded much of the work described on the Technology page.

Representative publications

1. V. Jayaraman, Z.M. Chuang, and L.A. Coldren, “Theory, Design, and Performance of Extended Tuning Range Semiconductor Lasers with Sampled gratings,” IEEE Journal of Quantum Electronics, vol. 29, no. 6, pp. 1824-1834, June 1993.
2. V.Jayaraman, M.E.Heimbuch, L.A.Coldren, and S.P. Denbaars, “Widely Tunable Continuous-Wave InGaAsP/InP Sampled Grating Lasers, Electronics Letters, vol. 30, no. 13, pp. 1492-3, Sept. 1, 1994.
3. V. Jayaraman, “VCSEL Makers Pursue Lower Cost 1300 nm diodes,” (Heather Williamson Messenger Young Investigator Award) Laser Focus World, vol. 35, no. 8, August 1999, pp.159-168.
4. V. Jayaraman, M.Mehta, A.W. Jackson, S. Wu, Y. Okuno, J. Piprek, and J.E. Bowers, “High Power 1320 nm Wafer Bonded VCSELs with Tunnel Junctions,”  IEEE Photonics Technology Letters,  vol. 15, no. 11, November, 2003, pp. 1495-1497
5. V. Jayaraman and E. Hall “High Power Broadband Superluminescent Diode,” U.S. Patent no. 7,671,997, March 2, 2010.
6. V. Jayaraman “System for Swept Source Optical Coherence Tomography,” U.S. Patent no. 7,468,997, Dec. 23, 2008.


Marty Robertson

Marty grew up in San Diego, California and in 1985 his MA in Education/Counseling led him to Santa Barbara where he worked in student life at Westmont College for seven years. He then went on to earn a California Multiple Subjects Teaching Credential, a Social Sciences Credential, and Bilingual Certificate of Competency. During his 17-year teaching career he was distinguished in 2007 as an Outstanding Educator in Santa Barbara County specializing in ancient cultures and earth sciences, and in 2009 was selected as the tri-county Geology Teacher of the Year by Coast Geological Survey. In 2010 Marty left regular classroom teaching in order to direct Santa Barbara A Rocha, a Christian conservation organization. This involved educational outreach, practical environmental science, community outreach, and the supervision of the Five Loaves Farm, a 3-acre organic farm committed to growing top quality produce donated free of charge to the hungry poor of Santa Barbara. The farm now operates independently as the Good Dirt Farm. It was at this same time that Marty started working with Praevium Research taking on the tasks of cleanroom processing, device testing and research, IT, and office management. Marty continues to work with groups of students to do hands-on environmental science, having run numerous summer Creation Care Camps over the past three years and a watershed science class with the Santa Barbara Charter Home Based Partnership.

Chris Burgner

Christopher Burgner Headshot

Chris Burgner graduated from UCSB with a Ph.D. in Mechanical Engineering, from the research group of Dr. Kimberly Turner.  At Praevium he is the expert in all things MEMS, along with heading up the testing and data management for MEMS-VCSEL devices.

Devin Leonard

Devin Leonard functioned as Principal Engineer at Praevium Research, Inc. from 2005-2008, leading technical efforts toward SLED products as well as laser-based spectrometry sources. Currently, he is involved with Praevium on an as-needed consulting basis. He earned a BS in Engineering and Applied Science from the CalTech in 1989, and a Ph.D. in Materials Science from University of California, Santa Barbara in 1995. His Ph.D. research in crystal growth of quantum dots led to a patent and several publications that have been cited more than 1000 times, as research in this area continues to flourish. Dr. Leonard has for 12 years made materials and packaging developments in many corporate settings including Intel, Raytheon, W.L. Gore and Associates, and Rockwell Scientific Company, which span the differences between research and manufacturing. Whether the final product was a military Infrared Focal Plane Array, a laser array or emitters for communications, or an operational improvement across product lines, Dr. Leonard continues to contribute significantly to his technological and corporate surroundings.

Eric Hall

Dr. Hall has led several technical projects for Praevium, and continues to be involved with Praevium on an advisory basis. He received his BS in Engineering Physics from the University of California, Berkeley in 1995 and his Ph.D. in Materials Science from the University of California, Santa Barbara in 2000 where he developed long-wavelength VCSELs with record output powers and operating temperatures. Prior to joining Praevium in 2006, he was a Member of the Technical Staff at Agility Communications and then at JDSU following its acquisition of Agility in 2005. In that position he led a variety of teams on device design, process development, yield improvement, transfer to manufacturing, and transfer to contract manufacturer of widely tunable telecom transmitters and transponders. Dr. Hall holds eight patents and has authored over 25 papers on compound semiconductor and optoelectronic device technology.