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Experimental observation of the phenomenon of spectral switching for a class of partially coherent light

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3 Author(s)
Kandpal, H.C. ; Opt. Radiat. Stand., Nat. Phys. Lab., New Delhi, India ; Anand, S. ; Vaishya, J.S.

Experimental observations of the phenomenon of spectral switching are made for a class of partially coherent light incident on a circular aperture. The on-axis spectrum of the light in the far-field is different from the spectrum of the light at the aperture. It is shown that, depending on the value of the parameter a/L¯(ω) (a is the radius of the aperture and L¯(ω) is the effective correlation length of the light at the aperture at the central frequency ω0 of the source spectrum), the spectral shift shows a gradual change but for a particular value of a/L¯(ω) the spectral shift exhibits a rapid transition and the phenomenon of spectral switching occurs. The generation of many spectral lines, from a single spectral line, in the far-field is also demonstrated

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Quantum Electronics, IEEE Journal of  (Volume:38 ,  Issue: 4 )