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Appl Opt. 1994 Dec 20;33(36):8302-5. doi: 10.1364/AO.33.008302.

Relative phase control between two successive coherent anti-Stokes Raman-scattering signals for the recovery of spectral lines.


We have controlled the relative phase between two successively generated coherent anti-Stokes Raman-scattering signals with a homemade phase-shifting unit, the thickness of which could be automatically adjusted as the wavelength of Stokes beam scanned in a wide spectral range. With this technique we have recovered the Q-branch spectrum of carbon monoxide distorted by a large nonresonant contribution from propane. Also, we have selectively recorded the spectrum of hydrogen chloride buried in the spectrum of propane.


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