[Torrey,Jeff]

Update to 11463. One of the lens was definitely bumped in the 3 months since this post. Jeff and I remeasured the beam profile and adjusted the MM solution accordingly. Attached is the most up to date profile of the beam and beam parameters calculated via 11292. We then used JAMMT to account for the curvature of the optic that the beam will initially pass through. jammt_model_775.png calculates a beam waist of 443 um at 2.75 accounting for a plano concave mirror with a radius of curvature of -1.6m and index of refraction of the material of 1.444. Finesse predicts <1% cavity mismatch for these parameters.

If anyone wants to calculate this themselves the following distances between the optics are up to date, where the collimator is 0. Additionally the distances for a half trip through the cavity are done from Daniel's (x,y) coordinates of the mirrors in the filter cavity. These values are (11.779,1.163). This means the distance of a half trip in meters is d = [sqrt(11.779^2 +1.163^2)*2 + 11.779*2] * .0254 = 1.2 m. Add this on to the distance from the collimator Cavity M3 is to get the approximate waist location required in the cavity (should be at the M1 position, as seen in labpic_w_labels.png).