Saturation spectroscopy of potassium for frequency stabilization of violet diode lasers

Satoshi Uetake, Kazuhiro Hayasaka, Masayoshi Watanabe

Research output: Contribution to journalLetterpeer-review

10 Citations (Scopus)


We observed saturated absorption spectra of potassium at 404.8 nm with a frequency-stabilized violet diode laser. A diffraction grating in the Littrow configuration was used to get a single-mode output, and simultaneous resonant optical feedback from a confocal Fabry-Perot cavity was employed to stabilize the laser frequency. The observed short-term frequency fluctuations are 300 kHz for 1 s, and the upper limit on the instantaneous linewidth is 1.5 MHz. The optically locked laser can be continuously scanned over 4 GHz. The observed typical linewidth of the potassium transition is 3.6 MHz with a signal-to-noise ratio of 17. The transition is suitable for stabilizing frequency of violet diode lasers to a sub-MHz level.

Original languageEnglish
Pages (from-to)L332-L334
JournalJapanese Journal of Applied Physics
Issue number3 B
Publication statusPublished - Mar 15 2003
Externally publishedYes


  • Confocal Fabry-Perot cavity
  • Potassium
  • Resonant optical feedback
  • Saturated absorption spectroscopy
  • Violet diode laser

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


Dive into the research topics of 'Saturation spectroscopy of potassium for frequency stabilization of violet diode lasers'. Together they form a unique fingerprint.

Cite this