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ECE 299 Holography and Coherent Imaging Lecture 1 Gabor Holography David J. Brady Duke University Lecture 1: Gabor Holography www.disp.duke.edu/~dbrady/courses/ holography
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www.disp.duke.edu/~dbrady/courses/holography
ECE 299 Holography and Coherent Imaging
Lecture 1 Gabor Holography
David J. BradyDuke University
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Outline
• Course objectives• What is holography?• Gabor holography• Modeling coherent fields• Simulation of Gabor holograms
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Course Context
• Holography and Coherent Imaging is part of a three course sequence in optical systems
• Courses may be taken in any order
Lecture 1: Gabor Holography
ECE 376 Optical Design
ECE 375 Optical Imaging and Spectroscopy
Holography and Coherent Imaging
www.disp.duke.edu/~dbrady/courses/holography
Optical Systems
Lecture 1: Gabor Holography
• ECE 375 discusses systems with natural light illumination• Holography and Coherent Imaging discusses systems with laser illumination• ECE 376 considers optical components for either natural or laser illuminated systems
www.disp.duke.edu/~dbrady/courses/holography
Course Objectives
Students completing this course will be able to1. Layout analog and digital holographic recording systems2. Analyze sampling and resolution limits in holographic
systems3. Analyze the information capacity of holograms4. Analyze broadband hologram and OCT systems5. Design computer generated holograms6. Reconstruct images from holographically recorded data7. Analyze (and maybe reduce) speckle noise in coherent
images
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
What is holography?
• Holography is a method for measuring the electromagnetic “E” field using irradiance detectors.
• Holography is a type of “homodyne” interferometry• Analog holography relies on light induced changes
in the dielectric or transmissive properties of materials
• Digital holography relies on opto-electronic detection
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Homodyne vs. Heterodyne Detection
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
A New Microscopic PrincipleD. GABORNature 161, 777 - 778 (1948)
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Modeling Coherent Fields
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Scattering
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Scattering
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Scattering
Limiting object to plane z=0,
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Holographic Interferometry
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Holographic Interferometry
For monochromatic fields, the integral over time is trivial and
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Gabor Holography
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
What is the Fringe Frequency?
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
What is the Fringe Frequency?
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
What is the Fringe Frequency?
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Modeling Gabor Holograms
Lecture 1: Gabor Holography
Distance in mm, 5.5 micron sampling period
www.disp.duke.edu/~dbrady/courses/holography
Modeling Gabor Holograms
Lecture 1: Gabor Holography
Diffracted 8 mm with 0.6 micron wavelength
www.disp.duke.edu/~dbrady/courses/holography
Modeling Gabor Holograms
Lecture 1: Gabor Holography
Diffracted 36 mm with 0.6 micron wavelength
www.disp.duke.edu/~dbrady/courses/holography
Model of Gabor’s Hologram
Lecture 1: Gabor Holography
Diffracted 14 mm with 0.6 micron wavelength
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Reconstruction
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
Hologram, reconstruction andpseudoscopic reconstruction at 7 mm range
Lecture 1: Gabor Holography
www.disp.duke.edu/~dbrady/courses/holography
How is this a microscope?
Lecture 1: Gabor Holography
