There is a scale on the table kept in backward direction, i.e increasing distance from laser is decreasing measurement on the scale. 

In reference to elog 3561 the beam was as attached in Fig 1. The beam characterization was originally done with f=100mm lens at 101.5cm. The waist of beam before the lens was at -47.1 mm, i.e at 101.5 cm +4.71 cm=106.21 cm

According to the elog the lens f = 100 mm was moved later by d=0.2m. But, now the setup has two f=50mm lens. This was never mentioned in elogs that the lens was changed. 

For the modified setup:

The two f = 50 mm, -50mm lens are placed at 96.5 cm and 90.5cm.Hence, the relative distance between lens and waist of beam is 9.71cm and 15.71cm respectively.

The new beam propagation is as in Fig 2. I propagated the original beam (one before f=100 mm lens) after the two f = 50mm lens. 

The beam power before filter is 64mW. 

I wish to replace the energy filter before the HWP on the EOM path, with a beam splitter or beam sampler and make a separate path for SLM.