Now I have a PLMA-TDF-25P/400-HE thulium doped fiber from Nufern. If I want to have a numerical analysis to model the relationship of the output power and the fiber length in a simple thulium-doped fiber laser by MATLAB, how can I determine the concentration such as the following ones: emission/absorption cross section in 793nm and 2um, combining / filling factors of the pump and signal power.Finally, the summation of the population densities. Thank you very much if you could tell me the direct parameters or some methods to determine them
Thulium based fiber technology has matured in the last decade and is now the basis for a wide range of commercial systems providing amplified spontaneous emission (ASE), as well as CW and pulsed laser sources [1–4]. In the development of high peak-power fiber lasers, the primary limitations on scalability are associated with nonlinear phenomenon such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and self-phase modulation (SPM). Relative to Yb- and Er-doped fiber lasers, the longer wavelength of Tm offers the significant potential benefit of lower nonlinearity since SBS, SRS, and SPM thresholds scale proportionately with wavelength. Several notable laser performance results have been achieved using conventional step-index Tm-doped fibers operating in the 2 μm wavelength regime.
The following research report thee influence of higher order modes (HOMs) in large mode fibers operation in Q-switched oscillator configurations at ~2 μm wavelength. S2 measurements confirm guiding of LP11 and LP02 fiber modes in a large mode area (LMA) step-index fiber, whereas a prototype photonic crystal fiber (PCF) provides nearly single-mode performance with a small portion of light in the LP11 mode. The difference in HOM content leads to a significant difference in Q-switched oscillator performance. In the step-index fiber, the percentage of cladding light increases by 20% to >40% with increasing pulse energy to ~250 µJ.
It can help you to define this parameters,....
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-20-22-24295&id=244085
The articles authored by Daniel Creeden on resonant pumping of thulium fiber lasers provide very useful values for absorption and emission in Nufern Tm:fibers.
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