Alastair & Greg

On Saturyday we finished with the alignment on the Y-arm table and made an off-table projection of the beam to check the size and shape.  Photo of the bench is attached.  The visible laser was aligned to the CP and the CO2 laser coaligned to the visible laser.  It should all be ready for testing on the CP now.

Some notes:

There are a few things still not in their final configuration.  Firstly we need to fab a housing for the FLIR camera to match the X-arm one.  Then the camera needs installed on the bench.  We also need to install the IR sensor on the viewport before the system is run long-term unattended.  The laser had a problem with its RF driver and we swapped in a spare but were missing power connectors (5pin 40A connec) so at the moment the laser is running on a Sorensen next to the table.  The connectors are ordered.  The mask is mounted in its flipper mirror but the flipper is not connected up yet.  The flipper also needs the up/down sensor.  And we still need to put in the second flipper with the annular heating mask.

Data from this table:  Will add this once I locate my notebook, but the following was measured:

Polarizers 2 & 3 extinction ratios measured: 

Power meter used to calibrate output power to CP as a function of rotation stage (1/2 wave plate) angle :

QPDs are installed and aligned.  Each quadrant calibrated for power and center position measured.  We'll need to decide if we want to calibrate for position or use the values from the X-table where the QPDs are mounted on translation stages.  Calibration data: