10 Coherent engineering leaders
Kan Yang, Senior Director of Engineering & Quality at Coherent Corp., is one of ten Coherent engineering leaders listed here, alongside senior directors and directors in optics, lasers and photonics, IC engineering, and process and equipment engineering. A reader can learn how engineering leaders work at Coherent from people who have held the role.
Professionals to explore
David Söderström
LinkedInExperience: Director Process & Equipment Engineering · Coherent Corp.
David Söderström has been Director Process & Equipment Engineering at Coherent Corp. since September 2025, based in the Greater Stockholm area, and the profile lists InP wafer fabrication, wafer fab automation, process qualifications and yield improvements. David Söderström was Manager Epitaxy at Finisar Corporation from 2012 to 2019.
Glenn Bartolini
LinkedInExperience: Director, Engineering · Coherent Corp.
Glenn Bartolini has been Director, Engineering at Coherent Corp. since September 2020, based in Woburn, Massachusetts. Glenn Bartolini was Executive Director, Engineering at II-VI Incorporated from 2011 to 2020, VP, Engineering (Aegis Lightwave) at II-VI Incorporated from 2003 to 2011 and Director, Product Development at MagiQ Technologies from 2002 to 2003.
Hongyu Deng
LinkedInExperience: Senior Director of Engineering · Coherent Corp.
Hongyu Deng has been Senior Director of Engineering at Coherent Corp. since April 2025, based in Saratoga, California, and the profile lists laser design, epi, process, testing, optical design and packaging. Hongyu Deng was Senior Director of Optical Engineering at PsiQuantum from 2024 to 2025 and Director of Optics Engineering at Marvell Technology from 2019 to 2024.
Jonathan Ashbrook
LinkedInExperience: Director, IC Engineering · Coherent Corp.
Jonathan Ashbrook has been Director, IC Engineering at Coherent Corp. since June 2022, based in Homer, Illinois. Jonathan Ashbrook was Sr. Engineering Manager at II-VI Incorporated from 2019 to 2022, Engineering Manager, IC Engineering at Finisar Corporation from 2007 to 2022 and Sr. Digital Design Engineer at Intersymbol Communications from 2002 to 2007.
Kan Yang
LinkedInExperience: Senior Director of Engineering & Quality · Coherent Corp.
Kan Yang has been Senior Director of Engineering & Quality at Coherent Corp. since September 2025, based in the New York City area. Kan Yang was Director of Engineering at Coherent Corp. from 2022 to 2025, Senior Manager, Process Engineering at Coherent Corp. from 2020 to 2022 and Engineering Manager at Coherent Corp. from 2019 to 2020.
Lawrence Wang
LinkedInExperience: Director of Engineering · Coherent Corp.
Lawrence Wang has been Director of Engineering at Coherent Corp. since September 2025, based in Sunnyvale, California. Lawrence Wang was Senior Manager, Engineering, at II-VI Incorporated from 2018 to 2022, Director of Engineering at CoAdna Photonics from 2013 to 2018 and Pilot Line Manager at CoAdna Photonics from 2008 to 2013.
Loucas Tsakalakos
LinkedInExperience: Director of Engineering · Coherent Corp.
Loucas Tsakalakos has been Director of Engineering at Coherent Corp. since January 2023, based in Schenectady, New York. Loucas Tsakalakos was Director Of ROIC Engineering at L3Harris Technologies from 2021 to 2023, Senior Manager - Strategic Technology Partnerships at GE Research from 2020 to 2021 and Technology Platform Leader at GE Research from 2017 to 2020.
Nadhum Zayer
LinkedInExperience: Senior Director of Engineering · Coherent Corp.
Nadhum Zayer has been Senior Director of Engineering at Coherent Corp. since September 2023, based in Newton Abbot, England, and the profile headline describes the role as Senior Director R&D Engineering. Nadhum Zayer was Principal Design Engineer at OCLARO from 2007 to 2014 and Senior engineer at Bookham from 2000 to 2007.
Varathajan Rengarajan
LinkedInExperience: Senior Director, Engineering and Technology · Coherent Corp.
Varathajan Rengarajan has been Senior Director, Engineering and Technology at Coherent Corp. since September 2023, based in Pine Brook, New Jersey. Varathajan Rengarajan was Director Of Research Development at II-VI Incorporated from 2021 to 2023, R&D Manager at II-VI Incorporated from 2016 to 2021 and Senior Process Development Engineer there from 2007 to 2016.
Vartan V. Ter-Mikirtychev
LinkedInExperience: Director of Engineering, Lasers, Photonics Integrated Circuits & Metrology · Coherent Corp.
Vartan V. Ter-Mikirtychev has been Director of Engineering, Lasers, Photonics Integrated Circuits & Metrology at Coherent Corp. since August 2026, based in Budd Lake, New Jersey. Vartan V. Ter-Mikirtychev was Senior Engineering Manager, Lasers, Photonics Integrated Circuits, Spectroscopy & Metrology at Coherent Corp. from 2022 to 2026 and Director of Engineering at Veralas, Inc. from 2012 to 2015.
Choose the right perspective
Match the person's scope, such as lasers and photonics, optics, IC engineering, wafer fab process or quality, to the decision you face. Check when each current role started to judge how recent the person's view is.
Questions to take into the conversation
- 01What did you change first when you took on your current engineering role, and why?
- 02How do you move a laser or photonics design from the lab into volume production?
- 03What has your own work taught you about balancing new product work with yield and quality on existing lines?
Reaching Coherent engineering leaders
How can I contact one of these Coherent engineering leaders?
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About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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