发明公开
EP0368335A2 Polarization beam coupler adapted to produce output beam for monitoring
失效
Polarisationsstrahlkoppler zur Erzeugung eines AusgangsstrahlsfürÜberwachungszwecke。
- 专利标题： Polarization beam coupler adapted to produce output beam for monitoring
- 专利标题（中）： Polarisationsstrahlkoppler zur Erzeugung eines AusgangsstrahlsfürÜberwachungszwecke。
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申请号： EP89120884.5申请日： 1989-11-10
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公开(公告)号： EP0368335A2公开(公告)日： 1990-05-16
- 发明人: Naganuma, Norihisa , Takamatsu, Hisashi , Abe, Kenichi
- 申请人： FUJITSU LIMITED
- 申请人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 当前专利权人地址： 1015, Kamikodanaka, Nakahara-ku Kawasaki-shi, Kanagawa 211 JP
- 代理机构： Lehn, Werner, Dipl.-Ing.
- 优先权： JP283814/88 19881111; JP283815/88 19881111; JP230453/89 19890907
- 主分类号： G02B27/28
- IPC分类号： G02B27/28
摘要：
A polarization beam coupler adapted to produce an output light beam for monitoring is disclosed. The polarization beam coupler includes a polarization beam coupling cube (22) for coupling two incident light beams having polarization planes perpendicular to each other and projecting the coupled light beams on the same optic axis (21), a beam splitting cube (24) having a beam splitting film (23) formed from a dielectric multi-layer or single-layer film for extracting a monitor beam, and a quarter-wave plate (25) interposed between the polarization beam coupling cube (22) and the beam splitting cube (24) such that incident light beams to the beam splitting cube (24) may be circularly polarized light. Due to the construction, the output level of a monitor light beam can be prevented from depending upon the polarization planes of the incident light.
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