The next steps we should do are :
- to investigate a cause of the intensity fluctuation
* end green laser
* suspensions' angular motions
* doublecheck the RIN contribution if it's from the PSL or the X arm in the beatnote RFPD to make sure the RIN is dominated by the X arm transmitted light
- to think about how to make the system insensitive to the intensity noise
- bring the beat frequency to the zero cross point of the MFDs ?
- PLL ?
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We are limited by the intensity noise of the X arm transmitted green light.
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