jennifer.wright@LIGO.ORG - posted 16:29, Wednesday 24 July 2024 (79304)
Mode-matching calculation for AUX laser injection from HAM6 to HAM5
Keita, Jennie W
Keita and I worked out the distance behind SRM we have to place the AUX launcher to match the beam radius the IFO beam normally has on SRM on its way into the OFI.
This is based on measurements of beam profile Keita made in the optics lab with the aux laser mounted with a collimator on it.
The code used to do this is saved in ligo/home/jennifer.wright/ModeMatching/beam_diverg.py
The graph attached shows the measured points in orange and the fitted points in blue.
Beam waist, w0 is 0.916 mmBeam waist position in relation to front of launcher , z0 is -1.423 mRayliegh range for beam, z_R is 2.477 m Move launcher 3.986 m away from SRMDistance between OM1 and SRM is 3.646 mTherefore we propose installing a steering mirror at right angles to OM1/SRM line to get this longer distance to SRM.
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