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Nick Brewer: Difference between revisions
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'''<big>7/22/14</big>'''
We tried to see some absorption again today. The data is [https://wiki.physics.wisc.edu/yavuz/images/4/47/Absorption_Data_2014-7-21.pdf here], and looks unconvincing. I think in order to get a better spectrum we will need to measure fluorescence from the crystal like in [http://www.opticsinfobase.org/DirectPDFAccess/B2A160D3-AED0-E02F-14B040E3D6801A62_7350/josab-11-4-591.pdf?da=1&id=7350&seq=0&mobile=no Shen's paper] instead of trying to directly measure absorption.
'''<big>7/18/14</big>'''[[File:Absorption_Setup.jpg|thumb|300px|]]
We tried to see some absorption yesterday. We saw fluorescence at the wavelengths we expected to, but the numbers from the photodiodes aren't too convincing. Our setup is shown to the right. For each wavelength of light we took the ratio of the photodiode signals. Scanning over the wavelength was not done too systematically. We tried to get as many wavelengths as we could close to where the peaks should have been. We adjusted the wavelength by adjusting the grating angle, current, temperature, and piezo. We saw fluorescence at wavelengths near the peak, but the quantitative data does not look as good. Our results are shown [https://wiki.physics.wisc.edu/yavuz/images/4/42/Absorption_Data.pdf here].
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