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: 1672     Entry time: Fri Jul 15 14:34:58 2016
Author: awade 
Type: DailyProgress 
Category: Mode matching 
Subject: South path: AEOM Placement and beam profile  

The second EOM (an amplitude modulator: Newfocus-4104) was placed at the next waist and optics installed were lambda/2->AEOM(4104)->PBS. Location of the AEOM (referenced to laser head) was 1012 mm.

The beam was reameasured after this point (as a check) with a AR coated window pickoff. Fit was:

Horz. beam waist = 183.5091 um
Horz. beam waist position = 957.1859 mm
Vert. beam waist = 226.7887 um
Vert. beam waist position = 856.7048 mm.

Accounting for the AEOM and PBS length and RI this is pretty much right for placement of the AEOM.

 

--> Edit, fixed authour name. Fri Jul 15 17:06:45 2016

Attachment 1: plot20160715_south_AfterAEOMBeamProfile.eps  132 kB  | Hide | Hide all
plot20160715_south_AfterAEOMBeamProfile.eps
Attachment 2: data20160715_south_AfterAEOMBeamProfile.txt  138 Bytes  | Hide | Hide all
0.0254	0.0000005	0.0000005
1	1024	1152
3	1245	1337
5	1441	1498
7	1616	1625
9	1760	1817
11	1960	1875
13	2095	2057
15	2352	2213
17	2524	2346
ELOG V3.1.3-