Abstract
The light efficiency of the coherent-optical matched filter is determined by the integral intensity transmittance of the spatial filter; in other words, by the integral power spectrum of the target object. We increase the light efficiency by multiplying the object with a spatially fixed phase mask which disperses the light more evenly in the Fourier domain. The mask has to be designed to achieve a reasonable balance between increase of light efficiency and decrease of SNR. The SNR will decrease in general, since the target object is at an arbitrary position but the phase mask is at a fixed position. In special cases, however, the light efficiency can be increased considerably while the SNR remains almost the same as in the case of an ordinary matched filter.
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