Enhancement of Raman scattering by parametric mixing of the pump with its harmonic |
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| Authors: | S. Marchetti C. Gabbanini |
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| Affiliation: | 1. Academy of Fine Arts in Prague, ALMA laboratory, U Akademie 4, 170 22 Prague 7, Czech Republic;2. Institute of Inorganic Chemistry of the AS CR, v.v.i., ALMA laboratory, 250 68 Husinec-?e?, Czech Republic;3. Department of Chemistry, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;4. Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 40 Prague 2, Czech Republic;5. Institute of Science and Technology in the Art, Academy of Fine Arts, Schillerplatz 3, A-1010, Vienna, Austria |
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| Abstract: | A strong focusing of the pump laser is generally used to reduce the Stimulated Raman Scattering (SRS) threshold, but it also produces a phase matching condition in the region of strong gain. This causes a large threshold for SRS in the near infrared due both to the increased diffraction limit and to the destructive interaction of antiStokes–Stokes processes. However the phase matching condition can be used to reduce the threshold by Raman parametric mixing (RPM) of the pump with the second harmonic generated by a fraction of pump. It this way we have observed a lowering of the threshold of about a factor 2.3 and an increase of the SRS of the pump. |
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