JLSE
1
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- Dec 13, 2007
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A while back I was playing with a pointer, shining it across the front of my aqurium when I noticed multiple colours. I made mention of it on the forum, and picked at the idea for a while. The conclusion which I drew, was that the beam was hitting the silicone on the corners of the tank, florecing it, and then the corner of the glass was behaving like a prism and producing red, green and blue.
The idea of different wavelengths passed into the back of my head, and didnt give it anymore thought. Well EURIKA! Last night I was setting up a couple of labby's, and on one of them fed it some extra current [smiley=evil.gif]
It was running at 170ma and putting out 160mW, I got up to make a coffee, and when I returned to my desk the laser was dim and cooked.
Before I shut is off, I did what most do and fed it 300ma, and watched all of the pretty mode shifts. But there was something a little strange that I had never noticed before. On my LaserBee thermopile, I noted that the dot looked whitish, almost as if it was a shadow with a dim light. It had a yellow tint to it, but I could not pick this up with my camera, only blue appeared.
I turned the power all the way down to 80ma, put on my goggles, and peered into the cavity (dont try this at home).
The chip was giving off a strong yellow glow, with rings of green and red! I played with it a bit, took pictures and noticed at 150ma it still had approx 1/2mW of yellow! I set the focus to a fine point at 15ft, but instead of a dot I got a 6in long rectangle with the following colours, Maroon, Light Blue, Violet, Green, Deep Pastel Yellow, Gold, and Red!
I pointed this square dot onto my fridge, and just like always the camera doesnt do justice. But there is certainly something very different with these diodes over the usual monochromatic wavelength.
The pics were inhanced by brightness only, as the originals are black from the lights off.
* The yellow it produced looked like my fridge had a patch of schoolbus yellow painted on it! A deep pastel tone, If anyone is curious, I can post the untouched original pics for you to enhance on your own. There was NO alteration to the hue or saturation, and the pics look exactly like viewing with the naked eye, just not as vivid or defined.
The idea of different wavelengths passed into the back of my head, and didnt give it anymore thought. Well EURIKA! Last night I was setting up a couple of labby's, and on one of them fed it some extra current [smiley=evil.gif]
It was running at 170ma and putting out 160mW, I got up to make a coffee, and when I returned to my desk the laser was dim and cooked.
Before I shut is off, I did what most do and fed it 300ma, and watched all of the pretty mode shifts. But there was something a little strange that I had never noticed before. On my LaserBee thermopile, I noted that the dot looked whitish, almost as if it was a shadow with a dim light. It had a yellow tint to it, but I could not pick this up with my camera, only blue appeared.
I turned the power all the way down to 80ma, put on my goggles, and peered into the cavity (dont try this at home).
The chip was giving off a strong yellow glow, with rings of green and red! I played with it a bit, took pictures and noticed at 150ma it still had approx 1/2mW of yellow! I set the focus to a fine point at 15ft, but instead of a dot I got a 6in long rectangle with the following colours, Maroon, Light Blue, Violet, Green, Deep Pastel Yellow, Gold, and Red!
I pointed this square dot onto my fridge, and just like always the camera doesnt do justice. But there is certainly something very different with these diodes over the usual monochromatic wavelength.
The pics were inhanced by brightness only, as the originals are black from the lights off.
* The yellow it produced looked like my fridge had a patch of schoolbus yellow painted on it! A deep pastel tone, If anyone is curious, I can post the untouched original pics for you to enhance on your own. There was NO alteration to the hue or saturation, and the pics look exactly like viewing with the naked eye, just not as vivid or defined.
