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Find the odd one out.

(a) Frequency mixing

(b) Second-harmonic generation

(c) Optical mixing

(d) Raman and Rayleigh scattering

I had been asked this question during an online exam.

The doubt is from Nano Phase Materials topic in section Advanced Engineering Materials of Engineering Physics II

1 Answer

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Correct option is (a) Frequency mixing

For explanation I would say: The rest of the mentioned effects exhibit Bire fingence. When light passes through a material the incident ray splits into two rays, one of the same wavelength and the other of a different wavelength. This phenomenon is called double refraction. It is observed in NLO materials. Whereas frequency mixing is a passive material.

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