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Old 07-08-2007, 04:43 AM #1
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Default Can someone elxplain?

http://cgi.ebay.com/Jmar-Laser-Diode...QQcmdZViewItem

How do I use this??


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Old 07-08-2007, 05:14 AM #2
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Default Re: Can someone elxplain?

No clue, man...sorry
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Old 07-08-2007, 01:59 PM #3
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Default Re: Can someone elxplain?

www .jmar.com seems to be their web site. You could contact them directly.
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Old 08-24-2007, 12:14 AM #4
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Default Re: Can someone elxplain?

Who cares? With that many buttons and dials, it HAS to be fun to play with.
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Old 08-24-2007, 12:57 AM #5
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Default Re: Can someone elxplain?

It might cure constipation or ED if properly applied !!

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Old 08-24-2007, 05:45 AM #6
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Default Re: Can someone elxplain?

ROFLMFAO!! I fell off my chair when I read that... nice one Mike ;D

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Old 08-24-2007, 12:13 PM #7
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Default Re: Can someone elxplain?

Basicly, it is a sophisticated current and temperature regulator. In the scientific world at least, many experiments require precise intensity and wavelength. Any variation in current and temperature has the potential to effect both, particularly the wavelength.

I worked on a few experiments that involved tuning a diode laser to a ~780nm transition of Rubidium. To achieve this, you have to tune the wavelength to an incredibly precise value and keep it there. We first used what is called an Extended Cavity Diode Laser which is basicly a diode laser being passed onto a diffraction grating that reflected a narrow wavelength back into the diode. This has the effect of narrowing the wavelength the diode lases at. Our driver kept the current constant and also regulated a temperature plate that the laser was mounted on to ensure that any temperature variation was corrected. Without it, any chang in temperature or current would be enough to detune the laser from the Rubidium transition and the experiment does not work.

You can use it to your advantage though, there is usualy a fine current control knob that allows you to vary the current yourself to tune the laser to the wavelength you want.

EDIT: You use it by simply wiring in the diode and ramping up the current
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Old 08-25-2007, 02:09 PM #8
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Default Re: Can someone elxplain?

Bummer! I saw both of his items before he relisted them, for $0.99!! I should have just taken it regardless... :-/ Oh, well... I'll survive ;D

Thank you very much for the explanation Ben

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Old 08-25-2007, 02:15 PM #9
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Default Re: Can someone elxplain?

Well... just remembered that I had actually contacted J-Mar about it and they didn't have any info (outdated and obsolete item, from what they said). I knew it was a current drive (Duh! Laser Diode Driver), and I was positive it would have been a VERY precise instrument. Nevertheless, I chose to not dump $20 and end up with a new big and bulky gadget that I may not know how to use, and have it taking up space in my house... ;D

Hope whoever bought it enjoys it...

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