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The diffraction efficiency of each sector of a multi-sector holographic disc can be readily tested at the point of manufacture using the illustrated system.
English (United States)
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Holographic Disc Diffraction Efficiency Tester
The diffraction efficiency of each sector of a multi-sector holographic disc
can be readily tested at the point of manufacture using the illustrated system.
A light beam 10, produced by a laser 12, is applied to a one-to-one beam
splitter 14, which splits the beam into two beam components 16 and 18 of equal
optical strength. Beam component 16 impinges on one sector of a transmissive
holographic disc 20. The deflected portion of beam 16 is directed to an optical
detector device 22 which produces an electrical signal having an amplitude
proportional to the optical strength of the deflected beam. This signal is amplified
in an amplifier 24 before being applied to input A of a ratio circuit 26.
The second beam component 18 is applied directly to an optical detector 28
to produce an electrical signal having an amplitude proportional to the optical
strength of beam 18. The output of detector 28 is amplified by amplifier 30
before being applied to input B of the ratio circuit 26.
The output of ratio circuit 26 is a signal C = A/B, which by definition is equal
to the diffraction efficiency of the sector through which beam 16 has passed. The
output of ratio circuit 26 is applied to an indicator circuit 32 which can be read by
an operator to determine the actual diffraction efficiency of the tested sector. The
actual value can be compared to calculated values to determine whether the disc
meets predetermined quality standards....