Facts About Birefringent Crystal Revealed
Facts About Birefringent Crystal Revealed
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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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The polarization dependence with the refractive index may have various consequences, some of that are remarkably crucial in nonlinear optics and laser technologies:
This is often the commonest means of period matching for a variety of varieties of nonlinear frequency conversion like frequency doubling and optical parametric oscillation.
Birefringence is the house of some clear optical materials the refractive index depends on the polarization course - that is outlined as the path of the electric industry.
Equally, the polarization condition of a laser beam inside a laser crystal with thermally induced birefringence is distorted. The kind of distortion depends on the posture, Considering that the birefringent axis provides a various (e.
Figure 7 illustrates a birefringent (anisotropic) crystal placed involving two polarizers whose vibration Instructions are oriented perpendicular to each other (and lying in Instructions indicated by the arrows beside the polarizer and analyzer labels).
, along with the refractive index for specified wavelength depends on the relative orientation of electric discipline director and optical axis:
That is the most typical way of stage matching for different types of nonlinear frequency conversion which include frequency doubling and optical parametric oscillation.
Although it is frequent to interchangeably make use of the phrases double refraction and birefringence to point the flexibility of the anisotropic crystal to different incident light-weight into normal and remarkable rays, these phenomena actually consult with diverse manifestations of the exact same system. The particular division of a lightweight ray into two obvious species, each refracting at a different angle, is the whole process of double refraction.
Clear crystalline elements are normally categorized into two classes defined by the number of optical axes existing while in read more the molecular lattices. Uniaxial crystals have just one optical axis and comprise the largest spouse and children of widespread birefringent specimens, which includes calcite, quartz, and purchased artificial or biological buildings. Another significant class is biaxial crystals, which might be birefringent components that feature two impartial optical axes.
当线偏振激光光束在双折射晶体中传输时，如果偏振方向与双折射轴不重合，这时会包含两个方向具有不同波数的偏振部分。因此，在传输过程中，由于两偏振分量之间存在相对相位变化，于是偏振状态发生变化。
Straight optical fibers tend to be nominally symmetric, but However show some small diploma of random birefringence as a result of little deviations from best symmetry �?by way of example as a consequence of bending, other mechanical strain or tiny microscopic irregularities.
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。
If the electric industry has the course of the optical axis, 1 obtains the amazing index . This is achievable provided that the propagation route (much more exactly, the way in the vector) is perpendicular into the optical axis. For the other polarization way, 1 then obtains the normal index .