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Filling factor, F, is a quantity measuring the efficiency of absorption of pump in the core of a double-clad fiber.[1][2][3]

Definition

File:FillingFactor.png
Estimates of the pump efficiency in a double-clad fiber with F=0.8 (blue) and F=0.9 (red), discussed in[4] compared to the results of the ray tracing simulations[5](black curves).

The efficiency of absorption of pumping energy in the fiber is an important parameter of a double-clad fiber laser. In many cases this efficiency can be approximated with[4]

1exp(Fπr2SαL),

where

S is the cross-sectional area of the cladding
r is the radius of the core (which is taken to be circular)
α is the absorption coefficient of pump light in the core
L is the length of the double-clad fiber, and
F is a dimensionless adjusting parameter, which is sometimes called the "filling factor"; 0<F<1.

The filling factor may depend on the initial distribution of the pump light, the shape of the cladding, and the position of the core within it.

Application

The large (close to unity) filling factor is important in double-clad amplifiers; it allows them to reduce the requirements for the brightness of the pump and to reduce the length of the fiber laser. Such a reduction is especially important for the power scaling of various nonlinear processes, and contributions of stimulated scattering to the degradation of signal. Use of the filling factor for the estimate of the efficiency of absorption of the pump in fiber lasers allows quick estimates without performing complicated numerical simulations.

See also

double-clad fiber

Notes

  1. D. Kouznetsov, J. V. Moloney. Efficiency of pump in the double-clad fiber amplifiers. 2. Broken circular symmetry. JOSA B, 19, No.6, p.1259-1263 (2002). [1]
  2. D. Kouznetsov, J. V. Moloney. Efficiency of pump absorption in double-clad fibers amplifiers. 3. Calculation of modes. JOSA B, 19, No.6, p.1304-1309 (2002). [2]
  3. D. Kouznetsov, J. V. Moloney. Highly efficient, high gain, short wavelength and power scalable incoherent diode slab-pumped fiber laser amplifier. IEEE Journal of Quantum Electronics, v.39, No.11, p.1452-1461 (2003). [3]
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    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang


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