toward version 5

... these are the final fixes until the new release. There has been a complete rewritten core code with parsing and improved adaptive control. Here is a nice new video showing multi order stimulated Raman scattering (broadband) via the Nonlinear Schrödinger Equation.

At each point of conversion, the energy drops due to quantum defect as shown in the measurement window:

Additionally, free parameters have been added. This allows simultaneous variation of other parameters by assignment while only the free parameter is changed. For instance: parameter "a" is set as the central wavelength for the high reflecting and low reflecting mirror and the resulting cavity simulation will show the behaviour for different wavelength in a one-dimensional parameter variation of "a".

Tutorial "Nonlinear pulse propagation in fibers"

Here are the slides and videos of the tutorial "nonlinear pulse propagation in fibers"

slides: http://www.fiberdesk.com/heraeus-seminar-2013.pdf
videos: http://www.youtube.com/user/fiberdesk‎

from Hereaus Seminar:

http://photon.physnet.uni-hamburg.de/de/ilp/teaching/sose2013/wilhelm-und-else-heraeus-seminar/scientific-background/

status of fiberdesk 5

fiberdesk 5 - the next major release - will have the following features:

- parser
- custom measures via parser
- enhanced parameter variation
- enhanced plotting
- cw-SRS

Here is a first view on the new parameter variation dialog, where the custom measure M49 is evaluating the power from 1100-1200 nm, M1 is the average power so the result is "100*M49/M1" by parsing - the relative power content of Raman scattering. The modell is a cw fiber laser cavity and the pump power is varied.

Rate Equation and Parameter Variation

fiberdesk ignored the "add quantum noise" option during parameter variation. This bug is removed now. Below you see the variation of the input power in a fiber amplifier (1 W pump, rate equation without ASE) and the output power as a measurement result. Up to ~10 mW the amplifier gives the full small signal gain then saturuates and finally increases linearly because the output power is in the same order of magnitude as the input power.

However, if you perform the simulation again including ASE, the total output power is dominated by ASE (in the example 13 mW) in the range below some µW of seed power.

 

Update to fiberdesk 4

- new parameter variation dialog
- copy to clipboard supports unwrapped phase

Update on Copy and Parameter Variation

You are now able to copy either intensity or phase to the clipboard with the function "Postprocessing"->"Conversion to..."->"ASCII Matrix".
A bug concerning the full parameter variation is removed.

comma and dot

fiberdesk now asks for comma or dot convention if ASCII data is copied to the clipboard. Even if the Windows has set the preferences different programs behave differently and one requires to have this decision available.