Spatial mode control of radiation generated by frequency difference in periodically poled crystals.
We demonstrate the possibility to control the spatial mode of a narrow-linewidth, continuous-wave, infrared radiation beam generated by difference frequency in a periodically poled crystal. This can be achieved by acting directly on a few experimental parameters. We show that hollow beams can be generated. A numerical routine has been developed and results agree with experimental observations, without requiring any free parameters. The relevance of these results for high-resolution spectroscopy and atom manipulation is discussed.
Giusfredi
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Istituto Nazionale di Ottica Applicata (INOA), Largo Fermi 6, I-50125 Firenze, Italy.
Mazzotti
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Cancio
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De Natale
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