[Gerardo, Koji, Betsy]

The in-situ measurements of the OFI optical isolation showed the numbers between 25.7 to 27dB. This is a factor of 2 to 2.7 too much from the requirement of 30dB. These are also too high compared to the expected value  from the measurement in the optics lab. We need to consider to pull the OFI table out and assess the optical performance in the opt lab again.

- The beam launcher was installed on HAM6 ISI. The table is fixed on the ISI table with two fork clamps.
- The alignment was surprisingly easy (by chance). Once the beam is adjusted to hit the output aperture of the OFI (i.e. the one close to HAM6), it also went through the input aperture (i.e. the one away from HAM6).

- We used 4 types of power meter heads for the islation measurement. 2 Ophir PD-type, 1 thorlabs thermal sensor (turned out not sufficiently stable for our purpose), and 1 Thorlabs' integrating sphere. The sensors were held by hand.

- The below shows the measurement results. Any measured isolation did not qualify the requirement of 30dB...