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Conference 11948 > Paper 11948-25
Paper 11948-25

Thermal linewidth of a MEMS tunable VCSEL

Abstract

The flexible membranes used in MEMS tunable VCSELs are so small and light that thermally-induced vibrations can impact performance. We measure the thermal vibration spectrum of such a membrane showing peaks at the spatial vibration mode resonant frequencies of the membrane/plate. These vibrations result in a theoretical floor to the linewidth of the VCSEL. Frequency domain LiDAR and optical coherence tomography systems can get around this thermal linewidth limit with adequate clock measurement and processing. Essentially an OCT/LiDAR sweep with a concomitantly measured clock is a feed-forward linewidth reduction scheme. LiDAR ranging out to 10 meters has been demonstrated.

Presenter

Excelitas Technologies Corp. (United States)
Bart Johnson holds a BEE from the University of Minnesota and a PhD from MIT in electrical engineering. He has held engineering positions at MIT Lincoln Laboratory, AT&T Bell Laboratories, and McDonnell Douglas/Boeing. Since 2000 he has been employed as an electro-optics engineer at Boston-area startups CoreTek (tunable VCSELs), Azna (chirp managed lasers for telecom) and Axsun Technologies. His current position is Director of Electro-Optics Systems Engineering at Axsun involving laser-based NIR spectroscopy and Optical Coherence Tomography (OCT). In OCT, he contributes to electro-optical systems design and testing as well as theoretical modeling of swept laser sources.
Presenter/Author
Excelitas Technologies Corp. (United States)
Author
Excelitas Technologies Corp. (United States)
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Mark Malonson
Excelitas Technologies Corp. (United States)
Author
Excelitas Technologies Corp. (United States)
Author
Excelitas Technologies Corp. (United States)
Author
Excelitas Technologies Corp. (United States)
Author
Excelitas Technologies Corp. (United States)