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Message ID: 10101     Entry time: Wed Jun 25 14:52:22 2014
Author: Andres Medina 
Type: Update 
Category: elog 
Subject: Placing a lens between the steering mirrors and another lens between the second steering mirror and the cavity 

 I was asked to calculate the lenses that we need in order to obtained a Gouy phase close to 90 degrees between the two mirrors that are in the Xend green. Yesterday, I measured the distances between the mirrors, and the distance between the mirror relative to the cavity as illustrate in the image attached below. I looked in to the 40m elog and Manasa did the last update on the length of the cavity. She measured 37.7 + 0.05m. The waist size of the beam that was measured by Annalisa in ID 8637 after the Faraday was w0=2.943e-5m @ -0.039m. I calculated the waist size inside the cavity, and I found a waist of w0=2.2 mm. My plan this week is to keep working in the calculation and finish all the calculation this week so that next week I can go inside and place the lenses. 

Attachment 1: SchematicForXendGreenGoingToTheCavity.pdf  46 kB  Uploaded Wed Jun 25 12:49:38 2014  | Hide | Hide all
SchematicForXendGreenGoingToTheCavity.pdf
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