71.254.64.27: Using gamma as surface tension (to match surface tension article)

2013-11-21T23:44:02Z

Using gamma as surface tension (to match surface tension article)

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	~~Wilber Berryhill~~ is the ~~name his mothers and fathers gave him and he totally digs that name~~. ~~My working day job is an invoicing officer but I~~'~~ve currently utilized for an additional 1. For years he~~'~~s been living in Mississippi and he doesn~~'~~t plan on altering it~~. ~~One of the very~~ [http://www.~~zavodpm~~.ru/~~blogs~~/~~glennmusserrvji~~/~~14565~~-~~great~~-~~hobby~~-~~advice~~-~~assist~~-~~allow-you-get-going best psychic readings~~] ~~issues in the globe for him is doing ballet~~ and ~~he'll be starting something else along with it~~.<br><br>~~Here is my web page~~ ... ~~real~~ [http://~~formalarmour~~.~~com~~/~~index~~.~~php~~?do=/~~profile~~-~~26947/info/ love psychics] ([~~http://www.~~prayerarmor~~.com/~~uncategorized/dont~~-~~know~~-~~which~~-~~kind~~-of-~~hobby~~-to-~~take~~-up-~~read~~-the-~~following~~-~~tips~~/ ~~www~~.~~prayerarmor~~.~~com~~])		{{Distinguish\|fill factor}}
			{{About\|Fiber Optics\|"Filling Factor" in Quantum Hall Effect\|Quantum Hall Effect}}
			{{multiple issues\|
			{{Confusing\|date=September 2007}}
			{{Expert-subject\|Engineering\|date=February 2009}}
			}}

			'''Filling factor''', <math>~F~</math>, is a quantity measuring the efficiency of absorption of pump in the core of a [[double-clad fiber]].<ref>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). [http://www.ils.uec.ac.jp/~dima/josa2f0.pdf]</ref><ref>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). [http://www.ils.uec.ac.jp/~dima/josa3f0.pdf]</ref><ref>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).
			[http://www.ils.uec.ac.jp/~dima/01242365.pdf]</ref>

			==Definition==
			[[Image:FillingFactor.png\|thumb\|200px\| Estimates of the pump efficiency in a [[double-clad fiber]] with <math>F=0.8
			</math> (blue) and <math> F=0.9</math> (red), discussed in<ref name="Kouznetsov">{{Cite journal\|title=Highly efficient, high-gain, short-length, and power-scalable incoherent diode slab-pumped fiber amplifier/laser\| author= Kouznetsov, D.\| coauthors=Moloney, J.V.\| journal=[[IEEE Journal of Quantum Electronics]]\| url=http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=1242365&isnumber=27838\|volume=39 \| year=2003 \| issue=11 \| pages=1452–1461 \| doi=10.1109/JQE.2003.818311\|bibcode = 2003IJQE...39.1452K }}
			</ref>
			compared to the results of the ray tracing simulations<ref name="Liu">{{Cite journal\|
			title=The absorption characteristics of circular, offset, and rectangular double-clad fibers\|
			author=A. Liu\| coauthors= K. Ueda\|
			url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVF-497C4YV-BW&_user=10&_coverDate=12%2F15%2F1996&_alid=550869877&_rdoc=3&_fmt=summary&_orig=search&_cdi=5533&_sort=d&_docanchor=&view=c&_ct=3&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=688bbca25fdd98e29caadb676b003c1e
			\|
			journal=[[Optics Communications]]\|
			volume=132\|
			year=1996\|
			pages= 511–518\|
			doi=10.1016/0030-4018(96)00368-9\|
			issue=5–6}}
			</ref>(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<ref name="Kouznetsov">{{Cite journal\|title=Highly efficient, high-gain, short-length, and power-scalable incoherent diode slab-pumped fiber amplifier/laser\| author= Kouznetsov, D.\| coauthors=Moloney, J.V.\| journal=IEEE Journal of Quantum Electronics\| url=http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=1242365&isnumber=27838\|volume=39 \| year=2003 \| issue=11 \| pages=1452–1461 \| doi=10.1109/JQE.2003.818311\|bibcode = 2003IJQE...39.1452K }}</ref>
			:<math>1- \exp\left( - F \frac{\pi r^2}{S}\alpha L \right) ,</math>
			where
			:<math>~S~</math> is the cross-sectional area of the cladding
			:<math>~r~</math> is the radius of the core (which is taken to be circular)
			:<math>~\alpha~</math> is the [[absorption coefficient]] of pump light in the core
			:<math>~L~</math> is the length of the double-clad fiber, and
			:<math>~F~</math> is a [[dimensionless number\|dimensionless]] adjusting parameter, which is sometimes called the "filling factor"; <math>~0<F<1~</math>.

			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==
			<references/>

			[[Category:Optical fiber]]


			{{Engineering-stub}}

en>Lockley: replace context tag with technical tag

2012-06-19T20:14:58Z

replace context tag with technical tag

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Wilber Berryhill is the name his mothers and fathers gave him and he totally digs that name. My working day job is an invoicing officer but I've currently utilized for an additional 1. For years he's been living in Mississippi and he doesn't plan on altering it. One of the very [http://www.zavodpm.ru/blogs/glennmusserrvji/14565-great-hobby-advice-assist-allow-you-get-going best psychic readings] issues in the globe for him is doing ballet and he'll be starting something else along with it.<br><br>Here is my web page ... real [http://formalarmour.com/index.php?do=/profile-26947/info/ love psychics] ([http://www.prayerarmor.com/uncategorized/dont-know-which-kind-of-hobby-to-take-up-read-the-following-tips/ www.prayerarmor.com])

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71.254.64.27: Using gamma as surface tension (to match surface tension article)

en>Lockley: replace context tag with technical tag