5 Easy Facts About Birefringent Crystal Described
5 Easy Facts About Birefringent Crystal Described
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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。
The lessen area with the Michel-Levy chart (x-axis) marks the orders of retardation in multiples of somewhere around 550 nanometers. The region amongst zero and 550 nanometers is known as the very first get of polarization shades, and also the magenta coloration that occurs within the 550 nanometer location is often termed 1st-get red.
The polarization dependence of your refractive index might have several different consequences, many of which might be highly crucial in nonlinear optics and laser technologies:
This really is the most typical method of section matching for a variety of forms of nonlinear frequency conversion like frequency doubling and optical parametric oscillation.
For optical fibers and various waveguides, the excellence in between uniaxial and biaxial isn't going to use, Considering that the propagation direction is actually determined by the waveguide.
Calcite as well as other anisotropic crystals work as whenever they were isotropic products (which include glass) under these conditions. The optical route lengths of the light rays emerging with the crystal are equivalent, and there is no relative stage shift.
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即使是各向同性介质，也会由于存在不均匀的机械应力而产生双折射。这可以在两个交叉偏振器间放置一块有机玻璃观察：当施加应力到有机玻璃上，可以看到由于应力诱导的与波长相关的双折射效应而产生的彩色图像。
光纤和其它波导中，采用有效折射率差值描述更好。这与传播常数虚部的差值直接相关。
Straight optical fibers are frequently nominally symmetric, but Nonetheless exhibit some smaller degree of random birefringence due to very small deviations from best symmetry �?as an example because of bending, other read more mechanical pressure or smaller microscopic irregularities.
Colours in between 550 and 1100 nanometers are termed next-order shades, and so on up the chart. The black color in the beginning in the chart is known as zero-buy black. Many of the Michel-Levy charts printed in textbooks plot bigger-purchase hues up to your fifth or sixth order.
这一效应可应用于双折射调谐器中，因为它是与波长相关的（尽管折射率差与波长无关）。该效应通过自相位调制和交叉相位调制而与功率相关（参阅非线性偏振态旋转），有时用于光纤激光器中的被动锁模。
The approach will allow segregation of an individual refractive index for measurement. Subsequently, the remaining refractive index of a birefringent material can then be calculated by rotation on the polarizer by 90 levels.
The polarized light waves then journey through the analyzer (whose polarization place is indicated by the arrow beside the analyzer label), which will allow only Individuals factors of the light waves which can be parallel into the analyzer transmission azimuth to move. The relative retardation of 1 ray with respect to another is indicated by an equation (thickness multiplied by refractive index change) that relates the variation in pace between the normal and remarkable rays refracted through the anisotropic crystal.
If the electrical field has the way in the optical axis, a single obtains the amazing index . This is feasible provided that the propagation path (extra exactly, the course of the vector) is perpendicular to your optical axis. For the opposite polarization way, just one then obtains the everyday index .