(1) Fresnel lens on the top.

(2) A method of making the Fresnel lens is described.

(3) Various loss factors which may occur when the Fresnel lens is used to improve the utilization of solar energy are analyzed experimentally.

(4) Imaging characteristic of Fresnel lens for parallel incident rays is analyzed by ray tracing and experiments.

(5) The third chapter discussed how to perform a fresnel lens with the principle of fresnel zone diffraction.

(6) The . target is actually a rectangular Fresnel lens with the correct focal length so that an image of the light source is formed on the plane of the detector.

(7) The 16-step Fresnel lens had been fabricated by thin film deposition and ion beam etching and it has been used in refractive-diffractive CCD camera.

(8) The new method for designing Fresnel lens has a wide serration breadth and unequal pitch.

(9) Refinements in lenses (e. g. (), the Fresnel lens) and reflectors made it possible to substantially increase the light's intensity.

(10) Fresnel lens optical landing system (FLOLS) is a typical optical landing system for contemporary aircraft carriers.

(11) The imaging quality of curve Fresnel lens is better than plane one, because coma aberration was corrected.

(12) Diffractive efficiency of Fresnel lens is important factor to evaluate the quality of Fresnel lens.

(13) The Fresnel lens collector has much notable feature with ultra-thin, low cost, high condensing rate and easy-to-batch production. Also it can improve the distribution of light intensity heterogeneity.

(14) Fresnel lens on the top. Thickness and quality of the glass are impressive.

(15) The results of computer simulation can provide theoretical basis for the fabrication of 16 - step Fresnel lens.

(16) The characteristics of a solar concentrator is mainly presented. The structure[ ], advantages and imaging features of a Fresnel lens are analyzed.

(17) Moire pattern caused by the cascade of periodic structures of LCD, Fresnel lens, and Lenticular lens, etc. is a key concern in designing a high quality LCD rear projection screen.

(18) Based on the theory of scalar diffraction and on the Fourier optics, a formula of the diffractive efficiency with alignment error for the 4 step Fresnel lens is obtained.

(19) The contents as follow:1. Based on the actual parameter of laser direct writing system in our laboratory, designed a Fresnel lens.

(20) Some parameters, such as the diffraction aperture, the diffraction distance and phase levels of Kinoform, are discussed. They are key factors to the variable focal-length phase Fresnel lens.

(21) Four kinds of laser source are used to measure the diffractive efficiency of Fresnel lens.

(22) Fresnel lens system design was the first try and a commercial Fresnel lens was bought to analyse its model to use at the same time.

(23) We use the thin film deposition to make 16 step fresnel lens, which can obtains lightweight system, miniaturization and increases free degree of the design.

(24) And after employing UV light to cure the resin, the Fresnel lens collector on the PC substrate is fabricated. The Fresnel lens collector on PC substrate is tested in the sunshine.

(25) The optical design and optical efficiency of line focus cylindrical Fresnel lens for solar concentrator are discussed.

(26) We simulated the light exposure distribution of the mask and structure of the Fresnel lens in computer.

(27) The results of computer simulation can provide theoretical basis for the fabrication of Fresnel lens.