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KAGRA MIR (Absorption)
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ManuelMarchio - 16:50, Friday 29 July 2016 (284)Get code to link to this report
Preparing for scanning the Tama-size sapphire sample

I'm scanning the sample along the beam direction. I placed a translation stage with a micrometric screw below the mirror mount and set the sample height so that the pump goes at the centre of the sample.

Pictures 1,2,3 show how it was before.

Pictures 4,5 show the current setup.

I'm doing one measurement for each 5 mm of sample depth.

Images attached to this report
284_20160729094746_1.jpg 284_20160729094753_2.jpg 284_20160729094800_3.jpg 284_20160729094806_4.jpg 284_20160729094815_5.jpg
Comments related to this report
ManuelMarchio - 23:29, Tuesday 02 August 2016 (287)

In the following table, there is a summary of last measurements

  raw data filtered data
depth

absorption

ppm/cm

precision

ppm/cm

absorption

ppm/cm

precision

ppm/cm

0mm 13.0 7.2 12.9 1.7
5mm 12.4 7.3 12.3 1.6
10mm 6.8 7.4 6.8 1.2
15mm 9.8 8.6 9.7 1.3
20mm 9.3 7.9 9.3 1.1
25mm 9.0 8.3 8.9 1.3
30mm 7.5 6.4 7.5 0.9

"Depth" is the position of the incident sample surface with respect to the pump-probe cross point. According to the refraction effect, the cross point position inside the sample is double, so, given the sample thickness 60mm, the depth 30mm refers to the measurement at the opposite surface of the sample.

I attach the plots of the 6 sets of measurements.