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MIF (ASC)
kenta.tanaka - 21:49 Tuesday 17 May 2022 (20760) Print this report
Beam profile measurement along with TMSX IRQPD path

Miyakawa, Tanaka

## Abstract

## What we did

  • First, I checked the current optics around the TMS QPD. Currently, almost everything is in place as shown in klog12721's photo, only the T=2% BS has been removed.
  • Next, I placed a mirror between the BS between the GR filter and the lens 2 and the TMSX IR QPD2 to pick up the light for the beam profile. Figure 1 shows the beam profile measurement system.
  • I measured the beam profile along the axis of the picked-up light. Figure 2 shows the result. The zero point in this figure is where GR is 10 holes away from the GR filter, or 250 mm. Fig 3 shows the beam at around 150 mm. And then I obtained the size of the beam waist by fitting their measurement data. 
  • The following are the x- and y-axis beam sizes for the laboratory system.
    • x (lab): 38.1 um
    • y (lab): 38.3 um
  • This result is consistent with the previous measurement (klog12052).
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