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      Principles of interference microscopy for the measurement of surface topography

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      Journal: Advances in Optics and Photonics
      Publisher: The Optical Society

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          Simultaneous amplitude-contrast and quantitative phase-contrast microscopy by numerical reconstruction of Fresnel off-axis holograms.

          Etienne Cuche, Pierre Marquet, Christian Depeursinge (1999)
          We present a digital method for holographic microscopy involving a CCD camera as a recording device. Off-axis holograms recorded with a magnified image of microscopic objects are numerically reconstructed in amplitude and phase by calculation of scalar diffraction in the Fresnel approximation. For phase-contrast imaging the reconstruction method involves the computation of a digital replica of the reference wave. A digital method for the correction of the phase aberrations is presented. We present a detailed description of the reconstruction procedure and show that the transverse resolution is equal to the diffraction limit of the imaging system.
          Article 0 comments Cited 130 times – based on 0 reviews     Review now
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            Digital wavefront measuring interferometer for testing optical surfaces and lenses.

            Stuart Gallagher, Richard White, D Brangaccio … (1974)
            A self-scanned 1024 element photodiode array and minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100. The photodiode array samples intensities over a 32 x 32 matrix in the interference pattern as the length of the reference arm is varied piezoelectrically. Using these data the minicomputer synchronously detects the phase at each of the 1024 points by a Fourier series method and displays the wavefront in contour and perspective plot on a storage oscilloscope in less than 1 min (Bruning et al. Paper WE16, OSA Annual Meeting, Oct. 1972). The array of intensities is sampled and averaged many times in a random fashion so that the effects of air turbulence, vibrations, and thermal drifts are minimized. Very significant is the fact that wavefront errors in the interferometer are easily determined and may be automatically subtracted from current or subsequent wavefrots. Various programs supporting the measurement system include software for determining the aperture boundary, sum and difference of wavefronts, removal or insertion of tilt and focus errors, and routines for spatial manipulation of wavefronts. FFT programs transform wavefront data into point spread function and modulus and phase of the optical transfer function of lenses. Display programs plot these functions in contour and perspective. The system has been designed to optimize the collection of data to give higher than usual accuracy in measuring the individual elements and final performance of assembled diffraction limited optical systems, and furthermore, the short loop time of a few minutes makes the system an attractive alternative to constraints imposed by test glasses in the optical shop.
            Article 0 comments Cited 93 times – based on 0 reviews     Review now
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              Eye-length measurement by interferometry with partially coherent light.

              A Fercher, K Mengedoht, Dave W Werner (1988)
              With a multimode semiconductor laser we have been able to measure the optical length of the eye within a precision of 0.03 mm. A first series of in vivo measurements acoustically determined eye length.
              Article 0 comments Cited 62 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Advances in Optics and Photonics
                Abbreviated Title: Adv. Opt. Photon.
                Publisher: The Optical Society
                ISSN (Electronic): 1943-8206
                Publication date Created: 2015
                Publication date (Print): February 2015
                Volume: 7
                Issue: 1
                Page: 1
                Article
                DOI: 10.1364/AOP.7.000001
                SO-VID: 08f844da-b809-470a-850e-3c705b025baf
                Copyright © © 2015
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