General theory of linear, coherent optical data-processing systems
JOSA, Vol. 67, Issue 1, pp. 60-70 (1977)
http://dx.doi.org/10.1364/JOSA.67.000060
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Abstract
This paper concerns a general theory of linear optical data-processing systems. Well-known basic ideas are critically reviewed, fundamental constraints upon the system behavior are investigated, and a new operational notation is proposed. Every system is considered as a bidirectional processor and every two-dimensional signal is equivalently described in the space and frequency domain. Without referring to field-theoretical notation, the constraints of “reciprocity” and “losslessness” are introduced. In rough terms, reciprocity states equality of transmissions A → B and B → A, where A and B are points in the two reference planes, losslessness states equality of signal energies in the two planes. “Symmetry” has to be independently defined in the space and the frequency domain, and “shift invariance” and “spreadlessness” appear to be dual constraints. The important constraint of “time reversibility” is obtained when a system simultaneously satifies reciprocity and losslessness. In the second part, the general theory is applied to lenses, sections of free space, Fourier transformers, and magnifiers. With the aid of a suitable shorthand notation, the main results of Fourier optics can be easily derived.
© 1977 Optical Society of America
Citation
H. J. Butterweck, "General theory of linear, coherent optical data-processing systems," J. Opt. Soc. Am. 67, 60-70 (1977)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-67-1-60
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References
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- The time-harmonic field quantities are assumed to vary according to e^{-ωt}. The scalar treatment of optical phenomena implies the neglection of possible interactions between the x and y components of the electromagnetic field vectors inside the optical system.
- In mathematical terms ø satisfies the homogeneous Helmholtz equation in this region with a radiation condition at infinity.
- If not stated otherwise, all integrations extend from -∞ to +∞. The double sign convention in (1) which is discussed further down, was suggested by M. J. Bastiaans (private communication).
- Also "mixed" relations can be formulated where the excitation is described in the space domain and the response in the frequency domain (or vice versa).
- To the best of our present knowledge all (finite) optical weighting functions are realizable. This fact strongly contrasts with the situation in time-domain filtering, where the principle of causality puts severe limitations on realizability.
- At this stage, we take advantage of the double sign convention in (1). If the same signs had been chosen in (1) for either direction of transmission, Eq. (10a) would be transformed into G_{21}(R_{2}, R_{1})= G_{12}(-R_{2}, -R_{1}), according to (4). This asymmetry with respect to space and frequency description would prohibit us to develop the fundamental notion of duality in the further course of the paper.
- g_{21}* denotes the complex conjugate of g_{21}.
- In a more restricted sense, two systems are dual if the associated functions H_{21}(R) and m_{21}(r) have the same mathematical structure (this is the case, for instance, with lens and free space, see Sec. VI).
- In this light the Fourier relationship (1) can be viewed as a unitary coordinate transformation.
- Here "temporal" frequencies are meant and not "spatial" frequencies. Furthermore, t denotes the time variable.
- While a spreadless system is completely specified by the function m (r) and the choice of the coordinate system r(x, y), we need for the specification of a shift-invariant system besides H(R) and the coordinate system an agreement about the signs in (1). Clearly, if the sign convention is altered, H(R) is transformed into H(-R).
- In other words, the "powers" (=reciprocal focal distances) have to be added.
- In all these cascades the overall system properties are independent of the order of arrangement.
- Reciprocity of all systems yields the profit that all proofs need only be given for one direction of transmission.
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