• John Wallace

    Jwallace Silo 5d07a1d7ce0a1
    Senior Technical Editor (1998-2022)
    Phone: (603) 891-9228

    John Wallace was with Laser Focus World for nearly 25 years, retiring in late June 2022. He obtained a bachelor's degree in mechanical engineering and physics at Rutgers University and a master's in optical engineering at the University of Rochester. Before becoming an editor, John worked as an engineer at RCA, Exxon, Eastman Kodak, and GCA Corporation.

    Photo 194426267 / 2021 © Nataliia Mysik | Dreamstime.com
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    John Wallace
    Dec. 1, 2021
    In 2021, advances in optics and photonics encompass the fields of laser optics, integrated photonics, quantum optical systems, and much more.
    A spectroscopic gemstone-screening instrument allows rapid separation of natural from synthetic diamonds. Shown are the experimental fluorescence spectra from natural, HPHT-grown, and CVD-grown diamonds. N3 fluorescence at 415 nm was only detected in natural diamonds.
    John Wallace
    July 21, 2021
    A UV-fluorescence spectroscopy-based instrument with a handheld probe identifies various types of diamonds, as well as diamond fakes such as corundum, spinel, and beryl.
    In the ALPHA-2 experiment, antihydrogen atoms are trapped and laser Doppler-cooled to enable antimatter experimentation. At the center of the experiment’s vacuum chamber, magnetically trapped antihydrogen atoms are cooled via light at a 121.6 nm wavelength, which matches the Lyman-alpha line of hydrogen. Light at 243.1 nm is used to observe the spectral line of the atoms’ 1S-2S transition.
    John Wallace
    May 19, 2021
    Making, magnetically trapping, and laser cooling antihydrogen atoms via laser Doppler cooling leads to a stable assemblage of anti-atoms suitable for next-generation physics experiments...