User Tools

Site Tools


howto:align_beam_backreflection

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
howto:align_beam_backreflection [2015/11/05 17:43]
sisamakis
howto:align_beam_backreflection [2015/11/06 11:19] (current)
sisamakis
Line 7: Line 7:
 This is indeed normal, it is the result of using polarised light. Perfect alignment is reached when the lobes are more or less symmetric, that means they have roughly the same intensity. To reach this, you have to precisely position the beam to enter at the center of the objective entrance pupil, and the beam must be of course aligned with the optical axis of the objective. (Note that parallel beam displacement,​ not tilting, is necessary.) ​ This is indeed normal, it is the result of using polarised light. Perfect alignment is reached when the lobes are more or less symmetric, that means they have roughly the same intensity. To reach this, you have to precisely position the beam to enter at the center of the objective entrance pupil, and the beam must be of course aligned with the optical axis of the objective. (Note that parallel beam displacement,​ not tilting, is necessary.) ​
  
-{{:howto:backreflection_defocused.mp4|}}+{{:howto:backreflection_defocused1.mp4|}}
  
 The classic paper by E. Wolf "​Electromagnetic Diffraction in Optical Systems. II." shows some 4 lobed patterns for polarized light. ​  ​http://​rspa.royalsocietypublishing.org/​content/​253/​1274/​358 The classic paper by E. Wolf "​Electromagnetic Diffraction in Optical Systems. II." shows some 4 lobed patterns for polarized light. ​  ​http://​rspa.royalsocietypublishing.org/​content/​253/​1274/​358
howto/align_beam_backreflection.txt ยท Last modified: 2015/11/06 11:19 by sisamakis