Transmission holograms

For both geometries the diffraction efficiency approaches unity in value for Aperiodic behavior (24,25) efficiency as a function of the grating strength ( ), whereas the reflection efficiency exponentially approaches unity. 

The work dealt with phase and amplitude-phase transmission hologram-gratings with different thicknesses and constants, constructed, as a rule, in a symmetrical (or close to that) configuration of interfering beams relative to the sample surface. Main measured holographic parameters were the diffraction efficiency (DE) and selectivity contour of holograms, constructed under different recording and post-exposure treatment conditions. 

Fig. 1. a - dependence of diffraction efficiency (q) on phase modulation amplitude (rpi) for volume phase transmission (curve 1) and reflection (curve 2) holograms amplitude-phase transmission hologram with absorption index yo = yi = 0.1 (curve 3). b,c - intensity distribution in diffracted (solid lines) and zero (dotted lines) beams at deviation from Bragg conditions ( ) at reconstruction of transmission phase hologram (b) and transmission amplitude-phase hologram (c) at yi = Yo = 0.1 with phase modulation 1 - q>i = 0.25n, 2 -cpi = 0.75n, 3 - q>i = 1.25n, 4 - qu = 1.75n. 

Fig. 9. a - dependence of phase modulation of transmission hologram-gratings on spatial frequency of recorded interference p>attem y 1 - latent image hologram (after exposure) 2 -hologram after complete cycle of pxist-exposure treatment, b - angular selectivity contours of transmission holograms with different spatial frequency, recorded with q>i < 0.5n 1 -Y = 70 mm-i, 2 - y = 320 mm-i, 3 - y = 1100 mm-i. 

At given experiment geometry and transmission hologram thickness (T) the region of overlap of zero and diffracted beams on the exit surface of the sample (Aoui) with respect to that on the entry surface (Ain) should satisfy relationship Aoui/Am > 0.8. 

Fig. 25. The reconstructed images of parallel linear polarized transmission hologram and reflection hologram (a) reconstructed image of transmission recording hologram (b) reconstructed image of reflection recording hologram...

FIGURE 3 A simple optical system for (a) recording and (b) viewing a transmission hologram. 

The first form of thin transmission hologram that can be viewed in white light, the rainbow hologram, was developed by Benton in 1969. Another form of hologram that can be viewed in white light, the multiplex hologram, was produced by Cross in 1977. 

Figure 13.3. (a) Stack for producing a replicate of a reflection hologram, (b) Stack for producing a replicate of a transmission hologram. 

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