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    • Sergey Vasilyev

    Laser Scientist, IPG Photonics Southeast Technology Center

    Sergey Vasilyev is an expert in laser design, light-matter interactions, and applications of laser-based sources for spectroscopy. He co-authored more than 100 papers on these topics and has both industrial and academic experience. After graduating from Moscow State University, Dr. Vasilyev earned his Ph.D. through the Russian Academy of Sciences. Since 2011, he has been a Laser Scientist with IPG Photonics Southeast Technology Center. He and his colleagues at IPG Photonics Southeast Technology Center hold a number of world records in the field of ultrafast mid-infrared lasers and frequency combs.

    (Image credit: CREOL)
    FIGURE 1. Experimental setup: Second-harmonic generation (SHG); intrapulse difference frequency generation (IDFG); electro-optic sampling (EOS); λ/4 (quarter-wave plate); mid-infrared (MIR).
    Test & Measurement

    Dual-comb spectroscopy measures 240,000 spectral points in longwave infrared at video rate

    Dmitrii Konnov
    Sept. 9, 2024
    Spectrometry system obtains absorption spectra of gaseous molecules over a spectral range of 1.5 to 45 THz, with up to 240,000 spectral data points in a single measurement spanning...
    (Reproduced from T. P. Butler et al., J. Phys.: Photonics, 1, 044066 [2019])
    FIGURE 1. The brightness of the IPG Photonics CLPF femtosecond supercontimuum laser source is compared with that of a third-generation synchrotron and a thermal source; the inset shows the laser beam profile at the wavelengths above 6.7 µm.
    Test & Measurement

    Mid-infrared frequency combs open new avenues in spectroscopy, imaging, and remote sensing

    Sergey Vasilyev
    Jan. 11, 2022
    New developments in ultrafast mid-infrared (mid-IR) hybrid lasers enable the implementation of compact and reliable optical frequency combs for real-world applications.
    FIGURE 1. The progress of ultrafast mid-IR Cr:ZnS/ZnSe oscillators based on different mode-locking methods is compared: SESAM (squares), graphene (diamonds), Kerr-lens (circles), and by type of the gain medium: single-crystal (open symbols) and polycrystalline (solid symbols). Arrows show the record parameters obtained to date (based on the data published in references 1 and 2 and the most current results obtained at IPG Photonics).
    Lasers & Sources

    Mid-IR Lasers: Kerr-lens mode-locking in polycrystalline Cr:ZnS and Cr:ZnSe competes with Ti:sapphire

    Sergey Vasilyev
    May 5, 2015
    Kerr-lens mode-locking of polycrystalline chromium-doped zinc sulfide and zinc selenide leads to multiwatt output power, pulse durations approaching three optical cycles, and ...