Question

1. Explain with theory and mathematical derivations.

(a) What are the advantages of coherent microscopes over incoherent microscopes?

(b) What are the advantages of incoherent microscopes over coherent microscopes?

Answer 1

(1) Coherent imaging is characterized by a fixed phase relationship between rays emerging from different parts of the object under study. Therefore, it is linear in complex amplitude. Such fixed phase relationships do not exist for incoherent imaging and this is the advantages of coherent microscopes over incoherent microscopes.

(2) The question of whether coherent or incoherent imaging is preferable in terms of resolution has given rise to many discussions. Usually, this comparison is based on classical resolution criteria such as the well-known Rayleigh resolution criterion. From this point of view, incoherent imaging is often concluded to be ‘better’ than coherent imaging, given that the same imaging system is used in both cases and thus the advantages of incoherent microscopes over coherent microscopes.

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