| 摘要 |
<p>A provisional holographic lens H1 is recorded by causing the interference of a parallel reference beam with a divergent beam emitted from an optical fibre 27, and then a definitive holographic lens H2 is recorded by causing the converging, conjugate beam to the divergent beam to be formed by illuminating the provisional holographic lens by the reference beam and using this converging, conjugate beam to interfere with the beam emitted by an optical fibre 31. The definitive holographic lens H2 and the ends of the fibres 27 and 31 are embedded in a block of hardenable transparent synthetic material. The provisional holographic lens H1 may be positioned externally of this block or be enclosed with the other elements in this same block. This process in particularly advantageous, because it permits certain delicate optical adjustments to be eliminated and because it avoids certain causes of light loss.</p> |
