Laser Technologies Group

Berkeley Lab

Team

Vassilia Zorba

Group Leader & Staff Scientist

Dr. Vassilia Zorba is a Physicist Staff Scientist and Group Leader for the Laser Technologies Group at the Lawrence Berkeley National Laboratory in Berkeley CA. She is also an Associate Adjunct Professor in the Department of Mechanical Engineering of the University of California, Berkeley. Her research interests include ultrafast laser-material interactions, non-linear optics, remote sensing, laser-induced plasma chemistry, and laser ablation-based chemical analysis in electrochemical energy storage, with emphasis on next-generation Li-ion batteries. Her previous work focused on femtosecond laser surface structuring technologies and biomimetic material functionalization. Dr. Zorba  is a Fellow of the Royal Society of Chemistry. Her credits include more than 80 publications in peer-reviewed journals, numerous invited talks and a 2011 R&D 100 Technology Award. 

Richard Russo

Affiliate Scientist

Dr. Rick Russo (retired senior scientist) is an affiliate in the Laser Technologies Group at LBNL, and also is the Executive Chairman of Applied Spectra, Inc. His interests are in laser ablation chemical analysis, spanning fundamental research to commercialization. This technology and instruments have been adopted by DOE National Laboratories, government stakeholders, academia and industry for elemental and isotopic analysis. He is the co-inventor of the nanowire laser and ion texturing process that produced world record High Temperature Superconductor thin films. His most recent work is the discovery of LAMIS for measuring isotope ratios in atmospheric pressure plasmas. Applied Spectra has become a world leader for analytical spectroscopic instruments addressing applications of laser ablation spectrochemical analysis based on LIBS and ICP-MS.His credits include numerous awards and over 300 scientific publications.

Xianglei Mao

Research Scientist

Dr. Xianglei Mao is a Research Physicist at LBNL with 25+ years’ experience in laser ablation and laser-based chemical analysis. His research focuses on fundamental mechanisms of laser-material interactions and their use in the development of laser based spectroscopic techniques, laser-induced plasma chemistry, and laser ablation-based chemical analysis. His current research activities include femtosecond laser filamentation, laser ablation molecular isotopic spectroscopy, analytical atomic spectrometry, laser spectroscopy, plasma diagnostics, and data processing techniques. Dr. Mao has more than 150 scientific publications, and was a co-recipient of a FACSS Innovation Award (2011) and a R&D 100 Award (2012).

George Chan

Research Scientist

Dr. George Chan is a research chemist at Lawrence Berkeley National Laboratory (LBNL). Prior to joining LBNL in 2012, he was an Assistant Scientist on the research faculty in the Department of Chemistry at Indiana University.  He received a Ph.D. degree in Analytical Chemistry under the mentorship of Prof. Gary Hieftje at Indiana University in 2007. His research interests and expertise are in analytical chemical measurement and instrumentation, with emphasis on the use, characterization and understanding the basic fundamental processes, and further development and improvement of various plasma-based spectroscopies in modern multidisciplinary research. His current research activity revolves around chemical elemental and isotopic analysis; in particular, analytical atomic spectrometry, laser spectroscopy, plasma diagnostics, data processing techniques, and optical isotopic analysis with laser induced breakdown spectroscopy (LIBS) and laser ablation molecular isotopic spectrometry (LAMIS).

  • Email
  • Phone: 510-486-4462
  • Office: Building 50, Room 4036H

Jhanis Gonzalez

Principal Scientific Associate

Dr. Jhanis J. Gonzalez obtained his PhD degree in Chemistry from the Universidad Central de Venezuela in 2002, after which he spent two years as a post-doc researcher at Lawrence Berkeley National Laboratory (USA). Since 2004 he is a Scientist at Lawrence Berkeley National Laboratory, Berkeley. CA. USA. and the Technical Director and Product R&D Management, Applied Spectra, Inc. Fremont. CA. USA. His research focuses on understanding mechanisms of laser-material interactions (ablation) using nanosecond and femtosecond pulsed lasers and their impacts on LIBS and all platforms of ICP-MS systems. He also is involved in the development of analytical methods for applications in energy, environmental, geochemistry, biological and metallurgy industries. Dr. Gonzalez has over 60 manuscripts published in peer review journals, more than 50 presentations and invited lectures at national and international conferences.

Jose Chirinos

Project Scientist

Dr.Jose Chirinos is a Chemist Project Scientist at the Laser Technologies Group. Prior to LBNL he was an Analytical Chemistry Professor and Former Director of the Graduate Student Program in Chemistry at Universidad Central de Venezuela. He has more than 25 years of experience in atomic spectroscopy  focused on the optimization of new methods for the analysis of petroleum, environmental, geological, and biological samples using ICP-OES/ICP-MS. His publications involve the optimization of new sample pre-treatments, design of micro-nebulizers and hydride generation devices and optimization of  GC-ICP OES, HPLC-ICP-OES  and laser ablation setups. 

Oropeza, Dayana

Dayana Oropeza

Senior Research Associate

Dayana Oropeza graduated with a Bachelor degree in Chemistry (Minor: Chemical Engineering) from The Central University of Venezuela in 2003. She has worked as an Assistant Researcher and now as a Senior Research Associate at Lawrence Berkeley National Laboratory for the past 11 years. She has been involved in several and diverse research projects including performing sample preparation of archeological samples:for posterior analysis with Neutron Activation Analysis and X-ray Diffraction, characterization of materials for rechargeable lithium batteries by Brunauer, Emmet and Teller and Particle Size Analysis, and currently her research focuses on the use of laser ablation as a tool for direct solid sample analysis by Laser Induced Breakdown Spectroscopy, Laser Ablation-Based Mass Spectrometry, Inductively Coupled Plasma Mass Spectrometry, and Inductively Coupled Plasma Optical Emission Spectroscopy. Ms. Oropeza  supports staff-members, students and visiting scientist sin their research endeavors. She has contributed to many of the peer review publications, presentations, and posters in national and international conferences.

Wenzhe Li

Postdoctoral Fellow

Dr. Wenzhe Li is a postdoctoral fellow in the Laser Technologies Group at Lawrence Berkeley National Laboratory (LBNL). He received his Photonics Science and Technology Ph.D. degree at Clemson University in 2021. His research interests are diffractive optics, Fourier optics, optical Orbital Angular Momentum (OAM), OAM carrying beam, integer/fractional orbital angular momentum (OAM) carrying symmetric/asymmetric beam, non-diffractive beams, vector beams, optical signal DEMUX/MUX device design, log-polar beam shaping optics modeling and fabrication. He is currently focusing on the long-range free space OAM beam delivery and sensing. 

 


Kevin Touchet

Postdoctoral researcher

Dr. Kevin Touchet obtained his PhD degree in physico-chemical analysis from the Sorbonne Université of Paris in 2020. His areas focus on the development and optimization of optical emission spectroscopy of plasma induced by laser ablation techniques, such as Laser Induced Breakdown Spectroscopy (LIBS) and Laser Ablation Molecular Isotopic Spectrometry (LAMIS), for the online or in situ isotopic analysis of nuclear solid materials.

Minok Park

Graduate Student Researcher 

Minok Park is a Ph.D. candidate student in Mechanical Engineering at UC Berkeley. He received B.S. degree in Mechanical Engineering from Hanyang University in 2015, and M.S degree from UC Berkeley in 2016. His research areas focus on the laser induced crystallization/annealing, pump and probe diagnostics, and laser induced ablation dynamics probing by time-resolved emission and scattering spectroscopy. Currently, he is co-advised by Prof. Grigoropoulos in UC Berkeley.

Yueran (Ruby) Gu

Graduate Student Researcher

Yueran (Ruby) Gu is a graduate student in Mechanical Engineering at UC Berkeley. She received B.S. degree in Mechanical Engineering from UC Irvine in 2020. Her research areas focus on the laser-material interaction in the femtosecond time regime, using laser ablation methods for materials processing to improve material surface properties for electrochemical storage applications. 

 

  • Email
  • Phone: 510-486-4462
  • Office: Building 70, Room 111E

Steffen Mittelmann

Visiting Graduate Student Researcher

Steffen Mittelmann is visiting the Laser technologies Group as a Fulbright scholar. He is doing his PhD at the Institute of Laser and Plasma Physics at Heinrich Heine University Düsseldorf, Germany. His field of study is the application of Laser induced Breakdown Spectroscopy (LIBS) on plasma facing material from inner walls of confinement fusion experiments using femtosecond lasers. 

  • Email
  • Phone: 510-486-4462
  • Office: Building 70, Room 111D

Zach Alvidrez

Student Assistant

Zach Alvidrez is attending UC Berkeley in his senior year of study where he is pursuing a Bachelor’s degree in Chemistry. His previous research experience was a computational study of inverted core-shell quantum dots through the University of Washington. He plans to pursue a PhD in Materials Science and Engineering to develop optical and electronic materials.

  • Email
  • Phone: 510-495-2899
  • Office: Building 70, Room 189

Andrew Fee

Student Assistant

Andrew Fee is an incoming undergraduate at the University of California at Santa Barbara where he will study Physics and Mathematics in the College of Creative Studies. In May 2021 he graduated from Bishop O’Dowd High School, where he independently studied physics, chemistry, and mathematics, while collaborating with department faculty to design curricula for new physics and mathematics courses for the school to offer.  

 

  • Email
  • Phone: 510-495-2899
  • Office: Building 70, Room 189

Bo-Young Han

Visiting Scientist

Dr. Bo-Young Han is a visiting scientist in the Laser Technologies Group. Dr. Han is a principal researcher in Neutron Utilization Research Division of Korea Atomic Energy Research Institute (KAERI). His work focuses on the use and advancement of isotopic and elemental analysis. Specifically his work involves novel techniques for the comprehensive, high resolution isotopic analysis of nuclear materials with the use all-optical technologies, such as Laser Induced Breakdown Spectroscopy (LIBS) and Laser Ablation Molecular Isotopic Spectrometry (LAMIS).

Bingying Lei

Graduate Student Researcher

Bingying Lei is a visiting scholar in the Laser technologies Group. She is a PhD candidate in Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (XIOPM). Her work focuses on Laser-induced breakdown spectroscopy. Her research background includes laser-material interactions, spectral analysis, spectral enhancement method, and gas discharge plasma.

 

Xiaodan Liu

Graduate Student Researcher

Xiaodan Liu is a visiting scholar in the Laser technologies Group. She is a Ph. D. Candidate in the College of Biosystems Engineering and Food Science, Zhejiang University. Her work focuses on the application of spectroscopy to qualitative analysis of crops and energy materials, soil nutrients and heavy metal prediction and evaluation. Her background includes hyperspectral imaging, mid-infrared spectroscopy, laser induced breakdown spectroscopy and modeling.