A color transparent screen was designed in this paper, utilizing a planar glass combined with lens array holographic optical elements (HOEs). The lens array HOEs were exposed using two coherent beams, one of which was the reference wave directly illuminating on the holographic material and the other was modulated by the micro lens array. The lens array HOEs can display the images with see-through abilities. Unlike the conventional ones that used the lens array HOEs as the screen solely, planar glass was adopted here as the waveguide. The projecting light was totally internalreflected in the planar glass to eliminate undesired zero-order diffracted light and realize high system compactness. Colorful display can be realized in our system as the holographic materials were capable for multi-wavelength display. To verify the effectiveness of this method, a color transparent screen incorporating the lens array HOEs and waveguide was designed. Results showed the circular display area with 20mm in diameter and the pixel resolution of 100μm were achieved in the system. This simple and effective method could be an alternative in the augment reality (AR) applications, such as transparent phone and television.
Ultrashort laser pulse has been widely used in various applications. Its parameters, such as the pulse duration and the
spectral bandwidth, should be controlled accurately in order to achieve high spatial and temporal resolution, as well as
high local field intensity. In this paper, we have proposed a method to trace the propagation of ultrashort pulses through
optical systems, especially the complex optics. The approach, in which both the material’s dispersion and optical
aberrations are taken into consideration, is developed based on the geometrical ray-tracing combined with wave theories.
This method is validated by simulating the propagation of a femtosecond pulse through a specific practical imaging system.
As the numerical result shows that the spatial-temporal performances of pulses are influenced greatly by optical elements,
the calibration arrangement is employed to compensate for those undesired distortions. The negative dispersion of the
optical grisms (the combination of gratings and prisms) is utilized in the calibration process to offset the positive dispersion
introduced by lenses. The final result shows effectiveness of the correction.
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