Lecture 39 Spatial Coherence and Holography Honors talks this evening….

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Presentation transcript:

Lecture 39 Spatial Coherence and Holography Honors talks this evening….

Spatial Coherence

Transverse Modes The 00 mode is the smallest….

Modes and phases Only the TEM 00 mode is fully spatial coherent

Spatial Coherence II Any spatial mode can be described as a linear combination of the various transverse modes

Spatial Mode Filtering Slit only wide enough to allow 00 mode To propagate….

Speckle

Wavefront correction

Simple Photography uses only amplitude Picture looks ‘flat’. Reason is, we have lost information (i.e. phase)

Two beam interference

Holography

Virtual Image Reconstruct 3D view with the phase

Zone Plates revisited 2D Fourier transform Equals a small spot

Phase contrast imaging 3D view of red blood cell…