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

C. Ishibashi, K. Suzumura, Hiroyuki Sasada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJ.L. Hall, J. Ye
Pages32-40
Number of pages9
Volume4269
DOIs
Publication statusPublished - 2001
EventLaser Frequency Stabilization, Satandards, Measurement, and Applications - San Jose, CA, United States
Duration: 2001 Jan 242001 Jan 26

Other

OtherLaser Frequency Stabilization, Satandards, Measurement, and Applications
CountryUnited States
CitySan Jose, CA
Period01/1/2401/1/26

Fingerprint

Molecular spectroscopy
molecular spectroscopy
Spectrometers
spectrometers
cavities
sensitivity
antinodes
Amplitude modulation
Dipole moment
frequency measurement
Frequency modulation
cells
standing waves
frequency modulation
iodides
gas pressure
Light sources
Semiconductor lasers
Absorption spectra
light sources

Keywords

  • Diode laser
  • High resolution spectroscopy
  • High sensitivity
  • Molecular overtone band
  • Near infrared region

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ishibashi, C., Suzumura, K., & Sasada, H. (2001). Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region. In J. L. Hall, & J. Ye (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4269, pp. 32-40) https://doi.org/10.1117/12.424484

Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region. / Ishibashi, C.; Suzumura, K.; Sasada, Hiroyuki.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / J.L. Hall; J. Ye. Vol. 4269 2001. p. 32-40.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ishibashi, C, Suzumura, K & Sasada, H 2001, Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region. in JL Hall & J Ye (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4269, pp. 32-40, Laser Frequency Stabilization, Satandards, Measurement, and Applications, San Jose, CA, United States, 01/1/24. https://doi.org/10.1117/12.424484
Ishibashi C, Suzumura K, Sasada H. Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region. In Hall JL, Ye J, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4269. 2001. p. 32-40 https://doi.org/10.1117/12.424484
Ishibashi, C. ; Suzumura, K. ; Sasada, Hiroyuki. / Sub-Doppler resolution molecular spectroscopy in the 1.66-μm region. Proceedings of SPIE - The International Society for Optical Engineering. editor / J.L. Hall ; J. Ye. Vol. 4269 2001. pp. 32-40
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AB - 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.

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