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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 11 — Jun. 1, 2009
  • pp: 1744–1746

Sub-Doppler resolution 3.4 μ m spectrometer with an efficient difference-frequency-generation source

Masashi Abe, Keisuke Takahata, and Hiroyuki Sasada  »View Author Affiliations

Optics Letters, Vol. 34, Issue 11, pp. 1744-1746 (2009)

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We have developed a 3.4 μ m spectrometer for sub-Doppler resolution molecular absorption spectroscopy. The source is based on the difference frequency generation using a 1.06 μ m Nd:YAG laser, a 1.55 μ m distributed-feedback laser diode, and a ridge waveguide periodically poled lithium niobate with a conversion efficiency of 9%/W. The generated radiation has a power level of about 300 μ W , a linewidth of less than 100 kHz, and a continuous tuning range over 10 cm 1 . The spectrometer allows us to observe six saturated absorption lines of C 12 H 4 with 0.3–0.4 MHz width and 1.3%–1.7% depth relative to the corresponding linear absorption lines.

© 2009 Optical Society of America

OCIS Codes
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6460) Spectroscopy : Spectroscopy, saturation

ToC Category:

Original Manuscript: March 18, 2009
Manuscript Accepted: April 18, 2009
Published: May 29, 2009

Masashi Abe, Keisuke Takahata, and Hiroyuki Sasada, "Sub-Doppler resolution 3.4 μm spectrometer with an efficient difference-frequency-generation source," Opt. Lett. 34, 1744-1746 (2009)

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