Invention Grant
- Patent Title: Optical wavelength tunable filter
- Patent Title (中): 光波长可调滤波器
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Application No.: US12391997Application Date: 2009-02-24
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Publication No.: US08687267B2Publication Date: 2014-04-01
- Inventor: Peiliang Gao
- Applicant: Peiliang Gao
- Agency: IPxLaw Group LLP
- Main IPC: G02F1/33
- IPC: G02F1/33 ; G02F1/11 ; G01J3/12 ; G02F1/125

Abstract:
An acousto-optical tunable filter is disclosed. The filter includes a medium having one or more indices of refractions alterable by the application of acoustic waves to the medium. The filter also includes an acoustic transducer coupled to the medium to generate the acoustic waves Altering the frequency of the acoustic wave selects among the different wavelengths in the incident light ray. The device also includes an optical mirror for reflecting a wave diffracted by the medium back to the medium so that it can again be diffracted. The first diffracted wave has its frequency shifted in one direction by the frequency of the acoustic wave while the second diffracted wave has its frequency shifted in the opposite direction, thereby compensating for the first shift. The result is an output ray with little or no frequency shift.
Public/Granted literature
- US20100214648A1 OPTICAL WAVELENGTH TUNABLE FILTER Public/Granted day:2010-08-26
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