Sum-frequency generation with a blue diode laser for mercury spectroscopy at 254 nm

J Alnis, U Gustafsson, Gabriel Somesfalean, Sune Svanberg

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Blue diode lasers emitting 5 mW continuous-wave power around 400 nm have recently become available. We report on the use of a blue diode laser together with a 30 mW red diode laser for sum-frequency generation around 254 nm. The ultraviolet power is estimated to be 0.9 nW, and 35 GHz mode-hop-free tuning range is achieved. This is enough to perform high-resolution ultraviolet spectroscopy of mercury isotopes. The possibility to use frequency modulation in the ultraviolet is demonstrated; however, at present the ultraviolet power is too low to give advantages over direct absorption monitoring. Mercury detection at atmospheric pressure is also considered which is of great interest for environmental monitoring. (C) 2000 American Institute of Physics. [S0003-6951(00)02810-2].
Original languageEnglish
Pages (from-to)1234-1236
JournalApplied Physics Letters
Issue number10
Publication statusPublished - 2000

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


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