Influence of incoherent background on diffraction divergence of narrow light beams of He-Ne laser with wavelength of 633 nm due to refractive index changes of Fe-doped lithium niobate sample is experimentally studied. Incoherent background is produced by light-emitting diodes (LED´s) of different average wavelengths and laser diode emitting in blue region of visible. It has been experimentally demonstrated that nonlinear diffraction of coherent red beams of He-Ne laser with diameters on full width of half maximum (FWHM) near to 15 - 20 μm may be totally compensated by means of assistance of incoherent background with shorter average wavelengths 455 – 465 nm and even much lower intensity compared with that for coherent beam.
The influence of incoherent background illumination produced by light-emitting diodes (LED´s) of different average
wavelengths and laser diode emitting in blue region of visible on diffraction characteristics of narrow coherent light
beams of He-Ne laser due to refractive index changes of Fe-doped lithium niobate sample are studied. It has been
experimentally demonstrated that nonlinear diffraction of red beams with wavelength 633 nm and diameters on full
width of half maximum (FWHM) near to 15 μm may be totally compensated using background light with average
wavelengths 450 – 465 nm. To provide the necessary intensity of incoherent background, the combinations of spherical
and cylindrical concave lenses with blue LED and laser diode module without focusing its beam have been used.
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