https://ideawaza.com/index.php?action=history&feed=atom&title=Verdet_constant 2026-09-30T12:12:13Z Revision history for this page on the wiki MediaWiki 1.46.0 https://ideawaza.com/index.php?title=Verdet_constant&diff=69640&oldid=prev 2010-11-05T09:14:41Z

<p>from http://en.wikipedia.org/w/index.php?title=Verdet_constant&amp;oldid=353226495</p> <p><b>New page</b></p><div>The &#039;&#039;&#039;Verdet constant&#039;&#039;&#039; is an [[optical]] &quot;constant&quot; that describes the strength of the [[Faraday effect]] for a particular material.<br /> <br /> The Verdet constant for most materials is extremely small and is [[wavelength]] dependent. It is strongest in substances containing [[paramagnetic]] [[ion]]s such as [[terbium]]. The highest Verdet constants are found in terbium [[Doping (Semiconductors)|doped]] dense flint glasses or in [[crystal]]s of [[terbium gallium garnet]] (TGG). This material has excellent [[Transparency (optics)|transparency]] properties and is very resistant to [[laser]] damage.<br /> <br /> The Faraday effect is chromatic (i.e. it depends on wavelength) and therefore the Verdet constant is quite a strong function of wavelength. At 632.8&amp;nbsp;[[nanometre|nm]], the Verdet constant for TGG is reported to be -134&amp;nbsp;[[radian|rad]]/[[tesla (unit)|T]]·m, whereas at 1064&amp;nbsp;nm it falls to -40&amp;nbsp;rad/T·m. This behavior means that the devices manufactured with a certain degree of rotation at one wavelength, will produce much less rotation at longer wavelengths. Many [[Faraday rotator]]s and [[Faraday isolator|isolators]] are adjustable by varying the degree to which the active TGG rod is inserted into the [[magnetic field]] of the device. In this way, the device can be tuned for use with a range of lasers within the design range of the device. Truly [[broadband]] sources (such as ultra-short [[pulse laser]]s and the tunable [[vibronic laser]]s) will not see the same rotation across the whole wavelength band.<br /> <br /> The Verdet constant is named after the French physicist [[Émile Verdet]].<br /> <br /> [[Category:Optics]]<br /> [[Category:Electric and magnetic fields in matter]]</div>

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