© 2011 Thorlabs
124 Thorlabs Beam 4.0
The green bulb indicates that the measurement was successful.
In general the axes X' and Y' do not coincides with the lab system which is described
by the axes X and Y. Furthermore the divergence angle for X' is independent from
the one of Y'. For highly elliptical beams like from semiconductor lasers the
divergence angles of X' and Y' could differ much more as in this example.
These values can also be found in the listing of the complete Results.
Note
All results are calculated from the applied fit!
Divergence Angle X' (Y')
Divergence angle is explained in chapter M2 Theory .
Asymmetry
Asymmetry is the quotient of divergence angles in Y and X scan directions. Values
differing from 1.0 indicate that the beam ellipticity is changing with z position, for
instance an elliptical beam is focussed to a round spot.
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