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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi all.
#include "WEAR-GOGGLES.h"
Thought you'd appreciate some eye candy, this is the optical wheel segment ... kindly sent me.
Enjoy!
btw it isn't as bright as you'd expect as the wavelength of the diode i am using is 405nm not 445, still it increases the usefulness of a 405nm diode manyfold.
i expect that a "right angle" setup using a suitable mount would generate a maximum output, with the lens set up to focus the green rather than the NUV, and a NUV filter in front to generate a pure green beam,
looks like one wheel can generate at least a dozen or more green "emitters" if not more, perhaps peel off the actual emitting surface and mount it onto one side of a mirror assembly in an hp laserjet scanner to get both green and blue (and red) from the same wheel..
The second picture is interesting, the liquid is Epson magenta printer ink mixed with isopropanol. it appears that this could be a fascinating alternative to more expensive dyes for pulsed laser use..
regards, -A
"Bother" said Pooh, as he deep fried a LiFePo4 cell with his solar panel...
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
yeah, looks more yellow than blue.
i had an idea, using this material i might be able to make a very compact white laser using a BRIR reflected off the green phosphor. the idea being that the red should just be reflected and the violet downconverted to green.. ought to work well if I use a surplus colour or B/W LCD viewfinder screen as the modulator.
has anyone done a spectral analysis to find out what the mystery material is?
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
You can't make a laser with that wheel. It's coated in a phosphor that simply fluoresces when hit with the low wavelength light. It doesn't emit coherent or monochromatic light. It's like a white LED ...
Laser beam in, non-coherent, non monochromatic light out.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
This is correct, you will not get coherent light out of the phosphor wheel. You will however get light at about the same intensity (power/area) as the beam coming in, so with focusing it should be possible to create a source with a much higher intensity then a LED.
To give you an idea, in the projector the red LED source is about 1cm^2 where the spot size on the color wheel is about 1mm^2, ~100x higher intensity then a LED source.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
lpfthings wrote ...
You can't make a laser with that wheel. It's coated in a phosphor that simply fluoresces when hit with the low wavelength light. It doesn't emit coherent or monochromatic light. It's like a white LED ...
Laser beam in, non-coherent, non monochromatic light out.
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Casio wheel test
