PHYS01200804001 Sohrab Abbas - Homi Bhabha National Institute

studies. With such beams, the and components of energy flow separate physically for large
angles |y|, of incidence and each component independently gives rise to O and H beams at the exit
face. Under these circumstances, Eqs.(38a-38b) ceases to be applicable. Further, after traversing a
crystal slab of thickness t, the O and H beams become wider by 2tsinθ B (cf.Fig.7). The effects of a
finite curvature of the incident wavefront can be accounted for by using the spherical [78-79] wave
approach.
Fig.8 Intensities of the forward (O) and diffracted (H) beams emerging from a symmetric LLL
interferometer (t S =t M =t A =t=20.25Δ S ) as a function of the reduced incidence angle y for χ = 0 (solid
curves) and χ = (dashed curves) [4].
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