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  • Spatial Coherence in Interferometry
    of the collimator lens and the ocular lens with beam splitter in. between and the CCD detector behind the ocular lens. The imaging aperture is located in the. common focal plane of the collimator lens and the ocular lens. This arrangement is a Kepler. telescope, which is an "afocal system
  • Advances in Interferometric Metrology
    . interferometer for testing spherical mirrors is shown in Figure 1. A magnified image of the scatterplate is shown in the. upper left corner of the figure. A small circular aperture is illuminated with a laser or broadband source producing a. source of limited extent for the interferometer. A focusing lens
  • Inside Filters
    ), isolating particular wavelengths (analytical chemistry and spectroscopy), and improving lens performance (usually imaging). Wavelength Isolation: Many applications, such as interferometry, require monochromatic sources. The creation of monochromatic light can be achieved by isolating natural
  • Collimation Tester
    of the lens in the beam expander (or. collimator) until horizontal fringes are observed in the. reflection. For 633 nm, there should be three to five. fringes visible in the reflection (for shorter wavelengths. more fringes will be visible). When fringes are. horizontal, the beam is well collimated
  • Dynamic Phase-Shifting Electronic Speckle Pattern Interferometer
    coupling to assist in the alignment of the incident polarization with the. fast or slow axis of the fiber. The field of illumination for the test beam is controlled changing the separation. between the illumination lenses. The test article is imaged onto the CCD via an imaging lens relay combination
  • What is Frequency Domain Analysis?
    . mechanically scan the objective lens of an interferometric microscope to generate a sequence of. interferograms, which are transformed to get phase information. However, the interferograms. generated by the NewView are far more complex, because of its white-light source. This. complexity is to our advantage
  • Mie scattering distinguishes the topological charge of an optical vortex: a homage to Gustav Mie
    the scattering sphere. is moved off the optical axis. Details can be found in [30]. The incident beam is focused by an aplanatic lens producing a convergent spherical wave,. which propagates to a diffraction-limited axial image. The aperture of the lens is taken as the. entrance pupil of the optical
  • High-Speed Data Acquisition for Medical Imaging Using SDR Technology (.pdf)
    , and unlike CT scans, it does not expose. the patient to elevated levels of radiation. Axial (Z). Scanning. Reference. Mirror. ). (. P R. Collimation. (t),. E R. Beam. Lens. Lateral (X or Y). Splitter. Scanning. E (t),P (). S. S. Low Coherence. Light Source. Objective. Lens. Beam. Reducer. Photo

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