发明名称 |
Polarization beam splitter or combiner |
摘要 |
This invention relates to elements such as birefringent crystals, which are used to separate a non-collimated input beam into two orthogonally polarized sub-beams or to combine two orthogonally polarized beams into a single beam. The optical device lessens or obviates the optical path length difference encountered in prior art devices and provides a polarization beam splitter/combiner that has substantially same optical path lengths for two split or combined beams propagating therethrough. Alternatively, the device is designed to provide a selected path length difference to compensate for polarization mode dispersion in other optical devices. The polarization beam splitter/combiner in accordance with the invention has a first uniaxial crystal having an o-ray path and an e-ray path and having the first port disposed at an end face thereof; a second uniaxial crystal having an o-ray path and an e-ray path, the e-ray path of the second uniaxial crystal being optically coupled with the o-ray path of the first uniaxial crystal and the o-ray path of the second uniaxial crystal being optically coupled with the e-ray path of the first uniaxial crystal. Alternatively, the axis of the second crystal is aligned in such a manner that the o-ray path is retarded by an extraordinary index of refraction of the crystal and the e-ray path is retarded by an ordinary index of refraction to equalize the optical path lengths.
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申请公布号 |
US2001036330(A1) |
申请公布日期 |
2001.11.01 |
申请号 |
US20010836465 |
申请日期 |
2001.04.18 |
申请人 |
DELISLE VINCENT;WILLS GONZALO;WALL PIERRE D.;HNATIW ALAN J.P.;CHENG YIHAO;SPICER DEAN SHELDON;MCLAUGHLIN SHELDON |
发明人 |
DELISLE VINCENT;WILLS GONZALO;WALL PIERRE D.;HNATIW ALAN J.P.;CHENG YIHAO;SPICER DEAN SHELDON;MCLAUGHLIN SHELDON |
分类号 |
G02B6/12;G02B6/32;G02B6/34;G02B27/28;(IPC1-7):G02B6/27 |
主分类号 |
G02B6/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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