Calvin He

Calvin He Email and Phone Number

Recent Chemical Physics PhD Graduate from the University of Maryland - College Park @ Machine.Complex
Calvin He's Location
Washington DC-Baltimore Area, United States
About Calvin He

I am a recent PhD graduate at the University of Maryland - College Park in Chemical Physics. My research is in the area of ultrafast/ultraintense laser physics under Professor Wendell Hill. My thesis topic was focused on developing techniques to measure the intensity at the focus of an ultraintense pulsed laser as well as to measure vacuum pressures using relativistic Thomson scattered light. When a focused infrared laser pulse collides with a gas target, electrons formerly bound to the molecules and atoms comprising the gas are liberated due to laser-induced ionization. These electrons oscillate and are propelled as a result of their interaction with the laser field, emitting radiation much like an antenna. It is this radiation, known to be relativistic (also called nonlinear) Thomson scattered radiation, that was studied in my thesis.The measurements included:- Performing spectroscopy on light captured within a gate of 5 ns using an intensified CCD camera - Angular distribution measurements of light using photomultipliers (MPPCs) placed inside a vacuum chamber- Angular distribution measurements of light filtered within the 600-650 nm band using fiber optic cables to relay the light out from inside a vacuum chamber to a streak camera that enabled a temporal gate of 300 psThese proof-of-principle experiments were conducted using the VEGA-2 200 TW and VEGA-3 1 PW lasers at CLPU in Salamanca, Spain spread over three campaigns. Furthermore, I contributed to theoretical studies that modeled and simulated various systems producing relativistic Thomson scattered radiation to understand the underlying physical effects (relativistic Doppler effect, harmonic generation, and laser intensity distribution) responsible for the spectral and angular characteristics observed in measurements.I graduated from the University of California - Los Angeles with a Bachelors of Science in Physics and a minor in Mathematics, having transferred from Pasadena City College. While I was a senior undergraduate, I worked as a research assistant working for the Barium-133 AMO Physics research group supervised by Professor Eric Hudson. In this role, I learned about FPGAs and Python coding for instrument control.I served in the Army Reserves from 2008 to 2017 as a Signal Support Systems Specialist, am experienced with information technology and Army radio communications, and have been deployed once to Afghanistan. I entered the IRR in 2018, and returned to the Reserves in 2020 serving as an Intelligence Analyst at a Technical Intelligence unit.

Calvin He's Current Company Details
Machine.Complex

Machine.Complex

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Recent Chemical Physics PhD Graduate from the University of Maryland - College Park
Calvin He Work Experience Details
  • Machine.Complex
    Co-Founder
    Machine.Complex Oct 2023 - Present
  • University Of Maryland
    Doctoral Researcher / Graduate Research Assistant
    University Of Maryland Jul 2017 - May 2023
    College Park
    Thesis Title: Experimental Measurements and Analysis of Relativistic Thomson Scattering Produced by Intense LasersActivities related to thesis research- Wrote MATLAB programs to simulate relativistic Thomson scattering (RTS) radiation from electrons interacting relativistically with an ultraintense laser- Analysis of collected data involving image processing, statistical and error analysis- Designed and built a RTS light measurement system consisting of fiber optic cables coupled using a camera lens to a streak, enabling a 300 ps gate.- Assembled and used light detectors using Multi-Pixel Photon Counters (MPPCs)- Assembled a remotely-controlled apparatus operating in vacuum which consisted of a motorized rotation stage, and linear translation stages.- Helped set up and operate a spectrometer w/ an intensified CCD gated camera for measuring plasma recombination spectra as well as RTS spectra. First author publication in Optics Express, DOI:10.1364/OE.27.030020.Other activities- Performed routine maintenance and operation of a table-top chirp pulse amplified (CPA) Ti:Sapphire laser system consisting of a mode-locking oscillator, regenerative amplifier, q-switched pump laser, and water-cooling chillers.- Performed routine maintenance and logs on a vacuum system reaching 10^-10 Torr consisting of dry scroll pumps, turbomolecular pumps, pneumatic gate valves, pirani and ion gauges, and an automated chamber venting system.- Shadowed graduate researchers as they performed experiments on generating populations of rotating molecules and measuring their relaxation dynamics, and familiarized with the topic of physical chemistry and relevant literature.- Developing an XFROG system for characterizing 400 nm laser pulses which had been frequency-doubled from 800 nm laser pulses using nonlinear crystals. Gave a culminating 15 minute presentation.- Ran MATLAB simulations of strong field ionization dynamics of atoms.
  • University Of Maryland College Park
    Teaching Assistant
    University Of Maryland College Park Aug 2017 - May 2018
    College Park, Maryland
    Spring 2018: Graduate Teaching Assistant for Physics 375 (Experimental Physics III) - Introduction to lasers and optics consisting of a theory and lab component. Assisted with in-class lab meetings and graded homework assignments and lab notebooks. 20 hours/week.Fall 2017: Graduate Teaching Assistant for Physics 276 (Experimental Physics II) - Introduction to electronics circuitry with emphasis on AM radios. Assisted with in-class lab meetings and graded weekly spreadsheets for two sections. 20 hours/week.
  • Us Army
    Company Communications Ncoic
    Us Army Jan 2015 - Jun 2017
    350Th Engineering Company, Bell, Ca
    Reservist TPU.Responsible for providing communications support for the 350th Engineering Company - a mounted, movement augmentation, combat engineering line company - to include inventory, distribution, and installation of both vehicular and manpack SINCGARS (Single Channel Ground Air Radio Systems), the training of soldiers in their use, and the establishment of radio communications for the company TOC (Tactical Operation Center) during the 350th EN CO's annual ECT (Extended Combat Training).Additional support provided to the company include being a grader for the APFT (Army Physical Fitness Test), a RSO (Range Safety Officer), and a vehicle TC (Tank Commander) and occasional driver.
  • Us Army
    Signal Support Systems Specialist (25U)
    Us Army Jan 2009 - Dec 2014
    311Th Expeditionary Sustainment Command, Los Angeles, Ca
    Reservist.Mobilized for a 9 month deployment to KAF, Afghanistan from 2012 - 2013. Duties performed during this mobilization include being on the Technical Support Helpdesk, assisting the network and systems administrators, and administrated a trouble ticket tracking system on Sharepoint, accounts for Adobe Connect, and Windows domain accounts through Microsoft Active Directory and Microsoft Exchange. Became CompTIA Network+ Certified during deployment. Crimped and untangled a countless number of CAT-5 Ethernet cables.
  • Wyzant
    Tutor
    Wyzant Mar 2017 - May 2017
    In-person tutoring for high school and college students on the subjects of math (Pre-Calculus, Calculus, Differential Equations) and physics (High School, Advanced Placement, College Introductory).
  • Hudson Amo Physics Research Group
    Undergraduate Research Assistant
    Hudson Amo Physics Research Group Jun 2015 - Jul 2016
    University Of California - Los Angeles
    My main role in the research group involved working with the Barium-133 group to get various scientific test instruments (i.e. Power Supplies, Signal Generators, Multi-channel Scalars, which use either the GPIB or serial interface) to be able to talk to computers via an open-source, Python-based platform known as LabRAD, and writing intuitive user interfaces for their operation and automation. This was done under the supervision of and in collaboration with post-doctoral researchers and graduate students.I was also part of the ion sources experiment, done in collaboration with two other undergraduate research assistants, and whose goal is to test the feasibility of using various salts as sources for the production of ions inside a vacuum chamber for the subsequent purposes of ion trapping and use as quantum qubits. Preliminary tasks include design of test chamber components using CAD software, the ordering of the necessary parts, and the assembly and installation of those parts into the test chamber. The experimental tasks include bringing the test chamber to the desired barometric state, powering the ion source, converting the detected signals into computer numerical data, and performing data analysis using computational tools such as Mathematica - all while troubleshooting any issues that arise along the way.

Calvin He Education Details

Frequently Asked Questions about Calvin He

What company does Calvin He work for?

Calvin He works for Machine.complex

What is Calvin He's role at the current company?

Calvin He's current role is Recent Chemical Physics PhD Graduate from the University of Maryland - College Park.

What schools did Calvin He attend?

Calvin He attended University Of Maryland College Park, University Of California, Los Angeles, Pasadena City College, South Pasadena High School.

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