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I have just started using this solver, and I am finding it incredibly useful(update: July 22 2013).
The following comment is with respect to the ytterbium laser option of the program.
It is important in some applications to be able to vary the the cladding-pump/core area ratio. Right now the program appears to pin the E-field/core area ratio to the pump/core area ratio.
It would be nice to include either an input for the pump cladding diameter, or for the overlap ratio so that this can be varied.