5 Tips about Birefringent Crystal You Can Use Today
5 Tips about Birefringent Crystal You Can Use Today
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各向异性透明晶体如方解石、石英等的折射率，是其固有的特性，称为永久双折射。
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直光纤只有很小的随机双折射，即使这样其中的光传输一段距离后偏振状态也会发生变化。存在保偏光纤，是利用了很强的双折射来抑制这些效应。
The optical route variance is really a classical optical principle connected to birefringence, and the two are outlined by the relative period shift between the standard and amazing rays as they emerge from an anisotropic material. On the whole, the optical path distinction is computed by multiplying the specimen thickness from the refractive index, but only once the medium is homogeneous and doesn't have major refractive index deviations or gradients.
Birefringence could be the home of some clear optical supplies which the refractive index depends upon the polarization course - that is defined given that the route of the electrical discipline.
In laser technology and nonlinear optics, the phenomenon of birefringence occurs mainly from the context of non-isotropic crystals:
Determine 7 illustrates a birefringent (anisotropic) crystal placed between two polarizers whose vibration Instructions are oriented perpendicular to each other (and lying in Instructions indicated via the arrows beside the polarizer and analyzer labels).
In other circumstances, birefringence is often induced in at first isotropic optical supplies (e.g. crystals with cubic framework, Eyeglasses or polymers) may become anisotropic resulting from the application of some external influence which breaks the symmetry:
Not only the refractive index, but in addition the group index turns into polarization-dependent. This issues e.g. with the propagation of ultrashort pulses: parts with diverse polarization propagate with Magneto-Optical Crystal distinct group velocities.
Although it is widespread to interchangeably utilize the conditions double refraction and birefringence to indicate the power of an anisotropic crystal to different incident light into standard and incredible rays, these phenomena basically consult with unique manifestations of a similar procedure. The actual division of a lightweight ray into two visible species, each refracting at a different angle, is the process of double refraction.
而在非线性光学和激光器技术中，双折射则是一些非各向同性透明介质的折射率依赖于偏振方向（即电场方向）的性质。后者的性质时非偏振光束入射到该材料上时产生双折射。
Alternatively, by measuring the refractive indices of the anisotropic specimen and calculating their distinction (the birefringence), the interference color(s) can be determined within the birefringence values together the highest in the chart. By extrapolating the angled lines again for the ordinate, the thickness on the specimen can be believed.
Nevertheless, when mild enters a non-equal axis, it is refracted into two rays, Each individual polarized Using the vibration Instructions oriented at right angles (mutually perpendicular) to each other and traveling at distinctive velocities. This phenomenon is termed double refraction or birefringence and is exhibited to the higher or lesser degree in all anisotropic crystals.
尽管光纤本身不具有双折射，光纤光学中常常遇到双折射效应：有时双折射来自于光纤弯曲（引起弯曲损耗）和随机扰动。并且还存在保偏光纤。
Alternatively, the remarkable wave deviates on the left and travels with the electrical vector perpendicular to that in the normal wave. For the reason that calcite is often a negatively birefringent crystal, the regular wave is the sluggish wave and also the incredible wave would be the fast wave.