Topic
Diffraction efficiency
About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a detailed experimental study of nonlinear optical scattering in nematic liquid crystals using low-power cw lasers is presented, where the authors quantitatively measured the dependence of the diffraction efficiency as a function of the optical intensity and magnetic field ranging from well below to far above the critical orientation threshold values.
Abstract: We present here a detailed experimental study of nonlinear optical scattering in nematic liquid crystals using low-power cw lasers. The scattering is effected by the phase grating created by two intersecting same-frequency lasers. These lasers interfere spatially to create an index modulation via their reorientation effects on the molecules. When aided by a dc magnetic field, the reorientation and nonlinear responses of the medium are enhanced. We have quantitatively measured the dependence of the diffraction efficiency as a function of the optical intensity and the magnetic field ranging from well below to far above the critical orientation threshold values. The scattering is also analyzed in terms of its dependence on the temperature, sample thickness, and the scattering geometry. The experimental results are in good agreement with theoretical expectations. We also point out some high-intensity effects and applications of this phase grating, e.g., in wave-front conjugation and holographic imaging.
51 citations
TL;DR: In this article, a new method of laser light deflection and modulation based on diffraction by electro-optic phase gratings has been demonstrated, which is applicable to thin-film light guides, requires relatively low power for high-speed operation, and is capable of high diffraction efficiency.
Abstract: A new method of laser light deflection and modulation based on diffraction by electro‐optic phase gratings has been demonstrated. The method is applicable to thin‐film light guides, requires relatively low power for high‐speed operation, and is capable of high diffraction efficiency.
51 citations
TL;DR: In this article, a 1D/2D switchable grating based on field-induced polymer stabilized blue phase liquid crystal (PSBPLC) was proposed for 1D and 2D grating.
Abstract: We present a 1D/2D switchable grating based on field-induced polymer stabilized blue phase liquid crystal (PSBPLC). For 1D grating, the diffraction efficiency of the first order is 37.2% and the phase modulation depth of the 1D grating can achieve 2π. For 2D grating, more than 90% of light intensity is distributed to the surrounding orders of zero order and the phase modulation depth is about 3.67π. Furthermore it shows fast phase modulation and 1D/2D switching time.
51 citations
TL;DR: This work presents a new (to their knowledge) optical test method, in which the Fizeau principle is now perfectly fulfilled by generating reference and measuring wavefront on the last optical surface, which carries a diffractive optical element.
Abstract: Fizeau interferometers with an additional diffractive optical element are frequently used for measuring spherical and aspherical surfaces. We present a new (to our knowledge) optical test method, in which the Fizeau principle is now perfectly fulfilled by generating reference and measuring wavefront on the last optical surface, which carries a diffractive optical element. This method has been examined experimentally by testing a reference f/0.68 spherical mirror and can be applied identically for testing aspheres. Several advantages of this method are discussed and proved experimentally.
51 citations
TL;DR: The temporal holographic response was found to depend strongly on optical recording configurations and on the recording beam intensities, and all-optical modulation of the holographic gratings with 2000 lines/mm is possible by modulation of a separate excitation beam of incoherent UV radiation.
Abstract: Polymers doped with photochromic spirooxazine and spiropyran dyes have been investigated for real-time holographic recording. The temporal holographic response was found to depend strongly on optical recording configurations and on the recording beam intensities. The exposure sensitivities that were required for maximal diffraction efficiency were 250 mJ/cm2 for the polymers doped with spirooxazine and 650 mJ/cm2 for those doped with spiropyran. All-optical modulation of the holographic gratings with 2000 lines/mm is possible by modulation of a separate excitation beam of incoherent UV radiation. The modulated gratings can be stored for relatively long times or erased immediately.
51 citations