File:Diffracted resonant cavity LED.JPG

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English: Photograph of a resonant cavity LED, collimated by a singly acryl lens and pointed directly towards a camera. The active surface of the LED is about 80 micron diameter, emitting 1 mW of slightly coherent red light of 650 nm.

This results in an overexposed image on the camera (center white spot) which is partly reflected by the camera's CMOS sensor towards diaphragm and camera lens. Using the 10 times optical zoom, a (second) reflection in the lens results in a diffraction pattern on the CMOS sensor (note that the red light is somewhat coherent) which matches the Fourier Transform of the pixel-pattern of this sensor. The pixel size in this case is 1.6 micron. This means that the image will be repeated along the horizontal and vertical axes, and, with less intensity, the diagonal axes. Magnification: ~400 times

Camera: Canon PowerShot SX110IS
English: Photograph of a resonant cavity LED, collimated by a singly acryl lens and pointed directly towards a camera. The active surface of the LED is about 80 micron diameter, emitting 1 mW of slightly coherent red light of 650 nm.
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Author Frans Segerink

Photograph made by F.B. Segerink, Optical Sciences group, University of Twente. Note that any coherent source will create diffraction patterns, even our sun, which is slightly coherent. The recently commercial available resonant cavity LEDs (in this case RC650-TO46FW, Roithner LaserTechnik gmbH) have a nice flower-like emitting area, resulting in very nice images.


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Date/TimeThumbnailDimensionsUserComment
current14:07, 24 November 2015Thumbnail for version as of 14:07, 24 November 20153,456 × 2,592 (445 KB)Frans Segerink (talk | contribs)User created page with UploadWizard

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