Laser Speckle and Applications in Optics
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1 Laser Speckle and Applications in Optics M. FRANCON Optics Laboratory Faculty of Sciences University of Paris Paris, France Translated by HENRI H. ARSENAULT Department of Physics Laval University Quebec, Canada ACADEMIC PRESS New York San Francisco London 1979 A Subsidiary of Harcourt Brace Jovanovich, Publishers
2 Contents Preface Chapter I Speckle in the Image of an Object Illuminated with Laser Light 1.1 Image of a Point Source. Fourier Transforms The Image of a Point Source in the Presence of a Slight Defect of Focus The Images of Two Monochromatic Point Sources The Images of a Large Number of Point Sources Distributed at Random The Spectrum of a Large Number of Coherent Point Sources The Spectrum of a Large Number of Coherent Point Sources Forming Identical Groups Having the Same Orientation and Distributed at Random Speckle in the Image of an Object Illuminated with a Laser Changing the Structure of a Speckle by Displacing the Plane of Focus The Speckle Patterns Produced in the Image of a Diffuse Object under a Change of Wavelength White-Light Speckle 19
3 VI Chapter II Contents Speckle Produced at a Finite Distance by a Diffusing Object Illuminated by a Laser 2.1 Fresnel and Fraunhofer Diffraction in Three Dimensions Speckle Produced at a Finite Distance by a Diffuse Object Speckle Produced by a Laterally Displaced Diffusing Object Speckle Produced by a Diffuse Object When the Orientation of the Incident Light Beam Is Changed Speckle Produced by a Diffuse Object under an Axial Translation of the Plane of Observation or of the Object Speckle Produced by a Diffuse Object under a Change of Wavelength Speckle Produced by a Diffuse Object When the Wavelength and the Position of the Plane of Observation Are Changed Speckle Produced by a Diffuse Object Itself Illuminated with Another Speckle Pattern 33 Chapter III Interference with Scattered Light 3.1 Historical Background Principles of Interference with Scattered Light Interference with Two Identical Diffusers The Burch Interferometer Interference Patterns Obtained from Two Laterally Shifted Diffusers Interference Patterns Obtained from Two Different Axially Shifted Diffusers 47 Chapter IV Interference Patterns Produced by Photographic Superposition of Laterally Shifted Speckle Patterns 4.1 Amplitude Transmitted by a Photographic Plate after Development The Fundamental Experiment of Burch and Tokarski The Superposition of a Series of Successive Exposures on the Same Holographic Plate Simultaneous Recordings with Birefringent Plates Recording with a Continuous Displacement of the Photographic Plate Recordings Obtained When the Orientation of the Incident Beam Is Changed Recordings Made with Polarized Light Recordings Obtained When the Orientation of the Diffuse Object Is Changed Recordings Made with More Than One Wavelength 62
4 Contents Vit Chapter V Interference Patterns Produced by Photographic Superposition of Axially Shifted Speckle Patterns 5.1 Circular Interference Fringes Produced by Two Successive Recordings on the Same Photographic Plate A Change of Wavelength between the Two Exposures A Change of Wavelength and a Displacement of the Photographic Plate between Exposures Circular Interference Fringes Produced by Two Successive Recordings on the Same Photographic Plate of the Image of a Diffuse Object Circular Interference Fringes Obtained with a Single Exposure by Means of an Amplitude Diffuser Circular Interference Fringes Obtained with More Than One Exposure When the Photographic Plate Is Axially Translated between Each Exposure Hyperbolic or Elliptical Fringes 72 Chapter VI Optical Processing of Images Modulated by Speckle 6.1 Introduction The Principle of a Technique to Extract the Difference between Two Images The Light Distribution in the Image Plane Improving the Profile of the Fringes and the Quality of the Images Image Coding and Decoding Image Multiplexing by Superposition of Laterally Shifted Speckle Patterns Image Multiplexing with Oriented Speckle Patterns 85 Chapter VII The Study of Displacements and Deformations of Diffuse Objects by Means of Speckle Photography 7.1 The Study of Lateral Displacements of a Diffuse Object When the Displacement Is Greater Than the Diameter of a Speckle Grain The Study of Lateral Displacements of a Diffuse Object When the Displacement Is Smaller Than the Diameter of a Speckle Grain The Study of Lateral Displacements of a Diffuse Object Illuminated with Two Beams When the Displacement Is Smaller Than the Diameter of a Speckle Grain The Study of the Lateral Displacement of a Diffuse Object with a Diffuse Reference Surface 95
5 Vlll Contents 7.5 The Study of the Axial Displacement of a Diffuse Object with a Diffuse Reference Surface The Speckle Observed in the Focal Plane of Lens О The Use of an Auxiliary Speckle Pattern to Illuminate a Diffuse Surface The Study of the Rotation of a Diffuse Surface The Study of the Vibrations of a Diffuse Object The Study of the Variations of the Slopes of a Diffuse Object 106 Chapter VIII Speckle in Astronomy 8.1 The Image of a Star at the Focus of a Telescope in the Presence of Atmospheric Turbulence The Study of Double Stars at the Focus of a Telescope in the Presence of Atmospheric Turbulence The Measurement of the Apparent Diameters of Stars by A. Labeyrie's Methods The Measurement of the Apparent Diameters of Stars with Multiple Telescopes 118 Chapter IX The Study of Surface Roughness 9.1 Surface Deviations The Use of Speckle to Study Surface Roughness Surface Roughness Measurement by the Correlation of Two Speckle Patterns Obtained by Changing the Incidence of a Laser Beam The Real-Time Measurement of Surface Roughness by the Amplitude Correlation of Two Speckle Patterns Corresponding to Two Orientations of the Laser Beam Surface Roughness Measurement by the Correlation of Two Speckle Patterns Obtained with Two Wavelengths Surface Roughness Measurements with a Source Having a Wide Bandwidth Surface Roughness Measurements with Partially Coherent Light 129 Chapter X Various Applications of Speckle 10.1 Differential Interferometry of Transparent Objects by Double-Exposure Speckle Photography The Use of Two Wavelengths to Study the Shape of Diffuse Objects The Use of Speckle to Determine the Transfer Function of an Optical System The Study of the Aberrations of an Optical System by Speckle Photography 137
6 Contents ix 10.5 The Focusing of a Lens by Means of Speckle Laser Speckle for Determining the Ametropia of the Eye The Use of the Double Exposure of a Random Distribution of Intensity to Measure Atmospheric Turbulence The Measurement of Motion Trajectories by Speckle Photography The Determination of the Velocities of Different Parts of a Diffuse Object by Speckle Photography An Example of Industrial Application of Speckle Interferometry 146 References 149 Index 159
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