I am currently using a Photo-diode to attempt to view the absorption of Rb at about 780nm. I'm using a signal generator to oscillate the frequency of the laser so that it scans over the resonances of the atoms. I've placed a photo-diode after the cell so that I can see the absorption, however I'm getting a constant signal in my scope.
I'm definitly catching the beam in the diode, as the signal in my scope drops to zero when I block the beam. I'm definitly crossing resonance, as I can see it in an IR viewer. I don't believe I'm saturating the diode, since I found the saturation point, and turned the power down significantly.
My circuit is very simple, and is set up as attached. Does anyone have any idea what I might be doing wrong? thanks in advance
I'm definitly catching the beam in the diode, as the signal in my scope drops to zero when I block the beam. I'm definitly crossing resonance, as I can see it in an IR viewer. I don't believe I'm saturating the diode, since I found the saturation point, and turned the power down significantly.
My circuit is very simple, and is set up as attached. Does anyone have any idea what I might be doing wrong? thanks in advance
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