File:Diffracted resonant cavity LED.JPG
Original file (3,456 × 2,592 pixels, file size: 445 KB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionDiffracted resonant cavity LED.JPG |
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 SX110ISEnglish: 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. |
Date | |
Source | Own work |
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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This image was uploaded as part of European Science Photo Competition 2015. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:07, 24 November 2015 | 3,456 × 2,592 (445 KB) | Frans Segerink (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX110 IS |
Exposure time | 1/40 sec (0.025) |
F-number | f/4.3 |
ISO speed rating | 100 |
Date and time of data generation | 17:31, 27 February 2015 |
Lens focal length | 60 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 17:31, 27 February 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 17:31, 27 February 2015 |
Meaning of each component |
|
Image compression mode | 2 |
APEX shutter speed | 5.3125 |
APEX aperture | 4.21875 |
APEX exposure bias | 0 |
Maximum land aperture | 4.21875 APEX (f/4.32) |
Metering mode | Center weighted average |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 15,091.703056769 |
Focal plane Y resolution | 15,157.894736842 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |