User:Pranav Rathi/Notebook/OT/2010/08/02/x & y Signal Drift Issue

under work

Setup & procedure

Steps

1. Measure the beam waist (2 x W=1.5) at the eyepiece lens of the telescope.
2. Setup the (1:1) telescope: In this case two planoconvex lenses (f=38.1mm of both) are used.
3. Measure the beam waist again (2 x W =1.5) at QPD, to make sure that the ratio is 1:1.
4. Straighten the beam after the telescope, using two aperture techniques [[1]].
5. Setup the QPD in the xyz translation stage.