发明名称 |
Wavelength Tunable Filter |
摘要 |
A wavelength tunable filter selectively transmitting light of any desired wavelength within the range of 450 nm to 1100 nm without using a band pass filter is disclosed. The wavelength tunable filter comprises a plurality of polarizers and a plurality of units between the adjacent polarizers on a common optical axis in a housing. Each unit has, in order from light incident side, a quartz birefringent plate, an ultra-wide band ¼ waveplate and an ultra-wide band ½ waveplate. The ultra-wide band ½ waveplate is accommodated in a cylindrical rotatable body and it is rotated by a rotating mechanism. |
申请公布号 |
US2017059851(A1) |
申请公布日期 |
2017.03.02 |
申请号 |
US201615241666 |
申请日期 |
2016.08.19 |
申请人 |
Luceo Co., Ltd. |
发明人 |
Ichimoto Kiyoshi;Yoshimura Kensho;Sakashita Ryuichi;Honda Umehiko;Hanashima Masakazu;Seo Kazuhiro |
分类号 |
G02B26/00;G02B27/28;G02B5/30 |
主分类号 |
G02B26/00 |
代理机构 |
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代理人 |
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主权项 |
1. A wavelength tunable filter comprising:
n+1 (n is an integer) polarizers disposed on a common optical axis; n units disposed between said polarizers, arranged by aligning on said optical axis, each unit including, in an order that incident light transmits, a quartz birefringent plate, an ultra-wide band ¼ waveplate and an ultra-wide band ½ waveplate, each of said n quartz birefringent plates having a thickness of 21−1 d (i=1 to n) where d is a thickness of the thinnest quartz birefringent plate; a housing adapted to hold said polarizers and said units therein; a cylindrical rotatable body adapted to hold the ultra-wide band ½ waveplate therein and rotatable about said optical axis within said housing; and a rotating mechanism to rotate said rotatable body. |
地址 |
Tokyo JP |