Per IO ECR E1300432:

Components to be changed in the IO path on the PSL:

1. IO_AB_M15 is changed to IO_AB_W1
2. IO_AB_PD1 is positioned on the reflected beam from the wedge
3. IO_AB_PD3 is added on the transmitted beam from the wedge, and is a large area PD, 100mm^2

Status:  not complete

1. IO_AB_M15 has been changed to IO_AB_W1 - DONE
2. IO_AB_PD1 is positioned on the reflected beam from the wedge - located there but cables are not connected
3. IO_AB_PD3 is added on the transmitted beam from the wedge, and is PDA100A, a large area PD, 100mm^2 - added but a PDA55 with only ~13mm^2 sensing area

Other information collected:

PD Channels:

H1:PSL-EOM_A_DC_POWER - thorlabs behind IO_AB_W1

H1:IMC-PWR_EOM_OUTPUT - thorlabs behind IO_AB_W1

PD,measured power:

IO_AB_PD3, thorlabs PDA55, 3.33mW

Incident on BS:

before the splitter, IO_AB_W1, 3.51mW

PD,measured power:

IO_AB_PD1, Newport 1811 RFPD, about 50uW - two beams, fast measurement, needs more time to set up

PD Channels:

H1:PSL-PERISCOPE_A_DC_POWER - bottom periscope trans

H1:IMC-PWR_IN_OUTPUT - bottom periscope trans

PD,measured power:

IO_AB_PD2, thorlabs PDA55, 83uW

Incident on steering mirror:

before steering mirror IO_AB_M9, 85uW

Incident on BS:

power in non-PD path, coming off of IO_AB_M10, 85uW