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KAGRA MIR (Absorption)
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MarcEisenmann - 10:27, Tuesday 31 August 2021 (2670)Get code to link to this report
Tama sample T1 absorption measurement started

Yesterday I started the measurement of the tama size sample T1.

Thanks to the help of Simon and Matteo I could identify the good sample.

Indeed there are now 2 tama size sample in PCI clean room but one seems to be different (maybe FC mirror?)

The one I installed is the one on the left of entry 301.

However, it seems that this sample creates at least 2 beams in reflection that hit directly the last prism on the probe path before the sample.

In turn, multiple reflections are sent a bit everywhere (but not towards the photo detector).

Using 50 mW of incident pump power I could estimate the power lost in these reflections to be around 10% of the incident power.

Because the sizes of these reflections are quite large, we started the measurement anyway.

These measurements will finish this evening and I will turn off the pump laser at that time.

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MarcEisenmann - 10:55, Wednesday 01 September 2021 (2672)

Measurement finished and reported in the 3 attached figures.

I finally choose to use this colormap for all plots as it is (I think) nice looking, color-blind and printing friendly.

Mean absorption seems to be 18+/-5 ppm/cm.

The sample was oriented to have the kanji for 'up' at the top.