Optical splitter
A birefringence and optical technology, applied in the field of optics, can solve the problems of increased cost of collimator, limited minimum volume, difficult collimation, etc.
Inactive Publication Date: 2006-10-04
JDS UNIPHASE CORP
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Problems solved by technology
[0005] An inherent disadvantage of this method of separating normal and extraordinary beams is that when this method is combined with an optical system, the birefringent block 103 produces an asymmetric beam split.
First, making the circulator 100 more difficult to align than collimators sharing a common axis
Second, circulators limit the minimum volume a device can have
Since the volume of the optical components directly affects the cost, the offset of the collimator increases the cost of manufacturing such an optical system
Method used
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[0040] In order to reduce the volume of the optical system, it is required to have a spectroscopic device which, according to the incident beam, provides normal and extraordinary linearly polarized components which can propagate symmetrically about the optical axis defined by the input beam. Figure 4 (a) and 4(b) are side views of two embodiments of the spectroscopic device capable of obtaining the desired effect.
[0041] exist Figure 4 In (a) and 4(b), light propagates along the y-axis through a birefringent crystalline material in the form of a crystalline structure. exist Figure 4 In the embodiment shown in (a), the required symmetry of normal and abnormal components can be obtained by cutting out the incident surface and the outgoing surface of the first spectroscopic device 203 . The important coefficients produced by cutting are A angle and B angle. Angle A lies in the z-y plane and represents the angle between the front surface of the crystal and the axis of propaga...
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An improved design of beam splitting device is described that is formed by cutting a birefringent material to predetermined dimensions. The beam splitting device resolves input light into mutually orthogonal linearly polarised beams. The mutually orthogonal linearly polarised beams propagate on either side of an axis as defined by the propagation axis of the input light. Such beam splitting devices lends themselves to a reduction in the overall dimensions of an optical system. In particular an optical circulator is described that employs such beam splitting devices so as to allow the transfer of light from a first optical port to a second optical port, and from the second port to a third. Not only does the employment of such beam splitting devices significantly reducing the dimensions of the optical system it also renders the device simpler to align.
Description
technical field [0001] The invention relates to the field of optics, in particular to a polarization beam splitter, which can greatly reduce the overall volume of the system by using the polarization beam splitter in an optical system requiring a polarization beam splitter. Background technique [0002] Beam splitters are commonly used in the field of optics where it is necessary to separate two superimposed light beams in space or the two polarization components of a single light beam. A number of ways to achieve this are provided in the prior art, using birefringent blocks, polarization dependent coatings or other polarizing materials. [0003] When separation of the polarization components of a beam is required, the most efficient approach is to use birefringent blocks. This birefringent material is an optically anisotropic material because its optical properties depend on the polarization and direction of propagation of incident light. Many crystalline substances, such...
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IPC IPC(8): G02B6/27G02B5/30G02B27/28
CPCG02B27/283G02B5/3083
Inventor 薛蒙常克伟王兴隆于池利弘
Owner JDS UNIPHASE CORP