In the study on the limit of resolution for holographic lens, an abnormality is discovered. Fourier transfer is used to analyze the limit of resolution for holographic lenses. The resolution does not follow the rule of inverse ratio with the radius of aperture. When the radius of aperture is relatively large, the resolution fits well with conventional refractive lens. However, when the radius of aperture is relatively small, with the increase of radius, the diffraction spot size increases significantly, and then rapidly decreases to normal level relative to conventional lens after reaching a maximum value.
Fourier transfer is used to analyze the limit of resolution for holographic lenses( HL). Detailed studies on the diffraction field distribution on the focal plane open out the cause that the resolution does not follow the rule of inverse ratio with the radius of aperture. The transimmisivity of HL changing with the radius makes its diffraction field experienced apodization effect, pedestal widen, new side lobe grown out processes, so the figure of the diffraction field distribution changes significantly. For this reason, the location of the first minimum as resolution criterion is not suitable.
The new laser host Nd:Sr5(VO4)3F crystal was grown by Czochralski method for the first time in China. Through the systematic studies on its fluorescence spectra, radiative decay time and absorption spectra, some new conclusions on the laser and spectroscopic characteristics of the crystal were reported.
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