The tight focused pump beam nonlinear frequency upconversion based on Hadamard coding is presented to acquire converted photon images. The pump beam is optimized by tight focusing to enhance its power
density in nonlinear crystal. In order to reduce the distortion caused by the point spread function effect, the object is encoded by measurement matrices and the converted photons corresponding to each pattern is measured. Thus the converted image with sharp edges can be reconstructed by the measurements and the measurement matrices. In the experiment, the image with 64 × 64 pixels is acquired and the peak of the dark noise is less than0.7photons/spatial/second element for 10 ms measurement time.
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