نتایج جستجو برای: diffractive optical element
تعداد نتایج: 468384 فیلتر نتایج به سال:
Direct laser writing is demonstrated by two-photon polymerization of multi-element diffractive optical components that can be switched on and off with an applied voltage. By exploiting the 3D capabilities microfabrication technique, multiple elements are written into a single liquid crystal (LC) layer. The switching behavior controlled simply changing write-voltage anisotropic polymer structure...
In this article, a ferroelectric liquid crystal (FLC) dammann grating (DG) is demonstrated based on the patterned photoalignment technology. By applying low electric field (10 V) on the FLC DG, the grating can switch between a diffractive state with 7 × 7 optical spots array and a non-diffractive state, depending on the polarity of electric field. The FLC DG shows very fast switching speed with...
The proper operation and performance of optomechatronic systems is fundamentally affected by changes of the relative geometry caused by thermal influences, mechanical displacements and vibrations. Such extrinsic and intrinsic disturbances can be compensated by active control of optical elements like lenses, diffraction gratings or laser sources. In the context with system design and performance...
A miniaturized sensor head for the optical measurement of velocities of fluids based on laser Doppler velocimetry is demonstrated. Holographic optical elements mounted on a glass substrate are used for beam splitting and deflection. Volume holograms in dichromated gelatin exhibit good optical efficiency (75% transmission of a cascade of two holographic optical elements). With diffractive device...
Optical phase singularities, also called optical vortices, are known to have applications in various branches of optics. Here the role played by optical vortices in collimation testing is explained. Interference and a diffractive experimental setup in which the presence of an optical vortex permits collimation testing are presented. It is shown that the moire fringes that aid in collimation det...
A vertical-cavity surface-emitting laser based bidirectional free-space optical interconnect has been implemented to interconnect two printed circuit boards. A total of 512 clustered channels with a density of 2844 channels/cm2 are transmitted over a distance of 83 mm. The optical interconnect is a combination of refractive microlenses and diffractive minilens relays.
Multifocus microscopy (MFM) allows high-resolution instantaneous three-dimensional (3D) imaging and has been applied to study biological specimens ranging from single molecules inside cells nuclei to entire embryos. We here describe pattern designs and nanofabrication methods for diffractive optics that optimize the light-efficiency of the central optical component of MFM: the diffractive multi...
Nano-structuring enables us to add additional degrees of freedom the design optical elements. Especially possibility controlling polarization is great interest in field nano-structured optics. For being able exploit whole range form-birefringent phase shifts, aspect ratios resulting element are typically much higher than conventional diffractive elements (DOEs), which does not only pose a chall...
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