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Related Experiment Video

Updated: Jun 20, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

High performance at new FIR wavelengths from optically pumped CH(2)F(2).

E J Danielewicz, T A Galantowicz, F B Foote

    Optics Letters
    |August 19, 2009
    PubMed
    Summary

    Researchers optimized the CH(2)F(2) laser, discovering new CO(2) pump and FIR laser lines. This work achieved over 30% conversion efficiency, confirming CH(2)F(2) as a high-performance optically pumped FIR laser.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Quantum Electronics

    Background:

    • Continuous-wave (cw) far-infrared (FIR) lasers are crucial for spectroscopy and materials science.
    • Previous research identified limitations in the efficiency of optically pumped FIR lasers.
    • The methyl fluoride (CH(2)F(2)) laser system showed potential for high performance but required further optimization.

    Purpose of the Study:

    • To investigate efficiency-limiting mechanisms in the CH(2)F(2) laser.
    • To maximize the performance and output power of the CH(2)F(2) laser system.
    • To discover new laser lines for expanded spectral coverage in the FIR region.

    Main Methods:

    • Conducted a parametric study of the CH(2)F(2) laser system.
    • Employed various cavity designs and optimized output coupling.

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  • Utilized carbon dioxide (CO(2)) laser pumping to excite the CH(2)F(2) medium.
  • Measured wavelengths and conversion efficiencies of generated FIR laser lines.

    • Main Results:

    • Discovered five new carbon dioxide (CO(2)) pump lines and ten new far-infrared (FIR) laser lines.
    • Achieved measured conversion efficiencies exceeding 30% of the theoretical maximum.
    • Optimized output coupling for the 184.6 micrometer line, doubling output power compared to the 118.8 micrometer line.
    • Observed a 33% conversion efficiency at the highest CO(2) pump power, indicating potential for further scaling.

    Conclusions:

    • The CH(2)F(2) laser demonstrates exceptional performance as an optically pumped FIR laser.
    • The discovered lines fill spectral gaps, enhancing the utility of FIR laser sources.
    • The system's high efficiency and power scaling potential confirm its status as the strongest reported cw optically pumped FIR laser.