I calculated with Jammt the best position and focal length in order to have a probe waist of 180um at the cross point. So I replaced the lens with  a f=300mm lens and measured again the profile.  Then I plot the pump and probe profiles together. The waists positions are aligned well, within 1cm to the crosspoint. Next step is to align the imaging unit and maximize the absorption signal of a reference sample adjusting the pump position.