40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Message ID: 1673     Entry time: Fri Jul 15 20:42:53 2016
Author: awade 
Type: DailyProgress 
Category: Mode matching 
Subject: South path: EOM2 Placement and beam profile 

A PLCX-25.4-64.4-UV-1064 (f = 143.23 mm) lens was placed in the path at z = 1247 mm.  The order of components after the AEOM was (Space for waveplate)->PBS->Steering Mirror->Lens->lambda/2->EOM2. The lens placement was very clost to the steering mirror, but it was difficult to find a choice of lens that would accommodate a suitably focused solution.

This final EOM (before the PMC) was placed at z = 1440 mm (ref. to laser head position).  

The beam was profiled after the EOM2 to get better characteristics for MM to the PMC.  The fit was:

Horz. beam waist = 246.0624 um
Horz. beam waist position = 1397.5481 mm
Vert. beam waist = 210.7356 um
Vert. beam waist position = 1252.1215 mm

The waist was set a little bigger to ease the MM placement sensitivity of the first lens for matching into the PMC. Data and plot attached.

Next MM to the PMC (although this wont be put in place until after we have gotten a first beat note).

 

Attachment 1: plot20160715_south_After2ndEOMBeamProfile.eps  132 kB  | Hide | Hide all
plot20160715_south_After2ndEOMBeamProfile.eps
Attachment 2: data20160715_south_After2ndEOMBeamProfile_retakeLastPoints.txt  147 Bytes  | Hide | Hide all
0.0254	0.0000005	0.0000005
0	646	968
2	785	1282
4	920	1510
6	1075	1637
8	1232	1816
10	1339	2010
12	1446	2146
14	1554	2242
16	1670	2356
18	1783	2440
ELOG V3.1.3-