Green beam characterization

The first plot shows the measurement of the green beam out of the SHG cavity and the fit result of it. The red spot is the position(-7.3cm) and the waist size of the green beam(26um). Origin is set at the first line of hole in front of the cavity.

In the second attachment, we put the position and the focal length of the three lenses we using now. We used the result of the first plot as initial value of Matlab program to get these result. We did some measurements of the beam size near the lenses this morning and compared them to the theoretical values, seems they fit well. Also if we considering the threshold of causing the aberration from the report, with 2cm beam waist, convex-plano lens should has a focal length large than 2m. The lenses we are using now is 100mm, 200mm, 1000mm, the beam size we have now is in the safe range.