Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region

C. Ishibashi, K. Suzumura, H. Sasada

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

We constructed a widely tunable spectrometer with sub-Doppler resolution and high sensitivity in the 1.66-μm region using a Fabry-Perot cavity as an absorption cell and a low-power extended-cavity laser diode as a light source. The light electric field is enhanced at the antinodes of the standing wave in the cavity cell, which enabled observation of saturated absorption spectra of the molecular overtone bands even though their transition dipole moments are small. The spectrometer sensitivity was drastically enhanced using a frequency modulation technique. The attained sensitivity allowed us to reduce sample gas pressure, optical power, and modulation amplitude, which resulted in a resolution of 320 kHz. We applied the spectrometer to precise frequency measurements of the 2ν3-band transitions of methane, and determined 66 frequency differences between them and two absolute frequencies with an accuracy of 40 and 600 kHz, respectively. We also recorded hyperfine-resolved spectrum of the 2ν4 band of methyl iodide, which gave unambiguous assignments.

本文言語English
ページ(範囲)32-40
ページ数9
ジャーナルProceedings of SPIE - The International Society for Optical Engineering
4269
DOI
出版ステータスPublished - 2001 1 1
イベントLaser Frequency Stabilization, Satandards, Measurement, and Applications - San Jose, CA, United States
継続期間: 2001 1 242001 1 26

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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