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An adjacent sequence iteration method for designing a dif- fractive element with function of controlling wavefront propagation is pre- sented, and a binary optical element for focusing a diode laser beam in a long focal depth is designed with this method, fabricated by means of photolithography and ion-etching techniques. The simulation calculated with the designed element indicates that the design is successful, and the experiment results of long focal depth by testing the produced ele- ment are consistent with the design requirements. © 2004 Society of Photo

A 4f-type optical system for performing matrix multiplication is presented. The system consists of a holographic mask and two Fourier lenses. With this system, the inner products of 4 x 8 and 8 x 4 matrices are calculated, yielding results that are in agreement with theoretical values.