 | Acta Crystallographica Section A Acta Crystallographica Section A FOUNDATIONS AND ADVANCES |
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![[Figure 2]](lk5040fig2mag.jpg)
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Figure 2
Schematic illustrations of the beam trajectories in a bent plane-parallel crystal for β < 0. (a) S1 represents the beam excited when Ws = −1. It propagates the longest distance (xmax) in the x direction, reaches the back surface at B1 and is partly reflected as the beam S2. S′1 represents a beam excited when Ws < −1 and S′2 the corresponding reflected beam from the back surface. (b) Beam trajectories to form IFRB and IFTB. IFRB from A2 are formed by interference between the beam S′2 once reflected and the beam S′′4 twice reflected from the back surface. IFTB from B′2 are formed by interference between the beam S01 reaching directly the back surface and the beam S′′3 once reflected from the back surface. (c) The variation range of the tie point on the dispersion surface for S′1 and S′2. The range from d1 to d2 on branch (1) is for S′1 and that from d′2 to d′1 on branch (2) is for S′2. ![[{\gamma _{{{\rm BbB}}}}]](teximages/lk5040fi181.gif) and ![[{\gamma _{{{\rm B}}3{{\rm bB}}}}]](teximages/lk5040fi182.gif) are the angles of the refracted beams in the BbB and the B3bB modes from the surface, respectively. |
![[Figure 2]](lk5040fig2.jpg)
| FOUNDATIONS ADVANCES |
ISSN: 2053-2733
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