For Gaussian beam ADDA assumes unity amplitude of the electric field in the
focal point of the beam. However, more readily available quantity in
experiments is the total beam power. The relation between the two is not always
trivial. For instance, formulae for approximate descriptions (like barton5) are
given in the manual (Section 10.4 "Radiation forces"). Formula for the rigorous
description of a tightly-focussed Gaussian beam is available in e.g. P.C.
Chaumet, B. Pouligny, R. Dimova, and N. Sojic, “Optical tweezers in
interaction with an apertureless probe,” J. Appl. Phys. 102, 024915 (2007).
doi: 10.1063/1.2759892
So the idea is to calculate this power (for unity amplitude of the electric
field) and write it down to the log file. It will simplify calculation of e.g.
optical forces for a given beam power. Moreover, conversion between different
system of units (e.g. CGS and SI) is much simpler for power than for electric
field amplitude.
Original issue reported on code.google.com by yurkin on 15 Oct 2011 at 9:42
Original issue reported on code.google.com by
yurkin
on 15 Oct 2011 at 9:42