On the basis of femtosecond optical pulse characterization, that has given optical field propagation theory of space-time transform 4f shaping system, analyzed zero dispersion property of shaping system, and meantime proved theoretical rationality.

Optical logic coding based on 4F system;

Wavelet threshold denoise method for 4f system based on SAR statistic parameters

Off-axis Fresnel holograms recorded with a magnified image, which is obtained by using a 4f system, are numerically reconstructed.

Using the optical correlation recognition technique,an image s correlation recognition system based on 4f optical system is suggested,which is a real-time infrared image processing system.

Introduce the principle of third-order nonlinear refractive index measurements using this system:nonlinear sample is fixed at the Fourier plane of the setup,a single laser shot is emitted into the 4f system,and the spatial distribution of the intensity in the output plane of 4f system is recorded by a CCD camera, then we can induce the third-order nonlinear refractive index by num.

Spatial frequency characteristics of optical 4f system;

To expand optical wavelet transform method into the digital signal processing domain,the optical implementation method of discrete wavelet transform algorithm(Mallat algorithm) for optical 4f system is proposed.

Study on the angular displacement compensation of filter function in the 4f optical system

The function for IFT & FT optical fourier transform using lens based on 4F optical system is analyzed so that point out the physics signification, which its parameters include and put out the design for the spectrum feature analysis experiment use the lens with the same focal length,combining with the computer and CCD sampling & analysis technology.