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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 9238–9246

Widely tunable difference frequency generation source for high-precision mid-infrared spectroscopy

Chun-Chieh Liao, Yu-Hung Lien, Kuo-Yu Wu, Yan-Rung Lin, and Jow-Tsong Shy  »View Author Affiliations

Optics Express, Vol. 21, Issue 8, pp. 9238-9246 (2013)

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We have developed a widely tunable mid-infrared difference frequency generation (DFG) source by mixing ∼ 1 W Ti:sapphire laser and 6 W Nd:YAG laser beams in a 50-mm MgO-doped long periodically poled lithium niobate (MgO:PPLN). The power of the DFG source is > 2 mW over the tuning range of 2.66–4.77 μm and its free-running linewidth is about 100 kHz. Combining various frequency stabilisation schemes for the Nd:YAG laser and the Ti:sapphire laser, the DFG frequency can be precisely controlled. Besides, its frequency can be determined better than 12 kHz by measuring the Ti:sapphire laser frequency using an optical frequency comb. Two high resolution spectroscopic studies on 12C16O2 molecule are demonstrated using this DFG source. The saturation spectra of R(18) and R(60) transitions of 0001 ← 0000 fundamental band at 4.2 μm and P(20) transition of [1001, 0201]I ← 0000 band at 2.7 μm have been observed and their absolute transition frequencies are measured with an accuracy better than 30 kHz.

© 2013 OSA

OCIS Codes
(190.4360) Nonlinear optics : Nonlinear optics, devices
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6460) Spectroscopy : Spectroscopy, saturation

ToC Category:

Original Manuscript: February 1, 2013
Revised Manuscript: March 13, 2013
Manuscript Accepted: March 18, 2013
Published: April 8, 2013

Virtual Issues
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics

Chun-Chieh Liao, Yu-Hung Lien, Kuo-Yu Wu, Yan-Rung Lin, and Jow-Tsong Shy, "Widely tunable difference frequency generation source for high-precision mid-infrared spectroscopy," Opt. Express 21, 9238-9246 (2013)

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