发明授权
- 专利标题: Optical frequency sweep control and readout by using a phase lock
- 专利标题(中): 光频扫描控制和使用相位锁定读出
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申请号: US10283649申请日: 2002-10-29
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公开(公告)号: US06870629B1公开(公告)日: 2005-03-22
- 发明人: Kurt R. Vogel , Timothy P. Dinneen , Michael E. Deeds , Jason R. Ensher , Christopher J. Myatt
- 申请人: Kurt R. Vogel , Timothy P. Dinneen , Michael E. Deeds , Jason R. Ensher , Christopher J. Myatt
- 申请人地址: US CO Boulder
- 专利权人: Precision Photonics Corporation
- 当前专利权人: Precision Photonics Corporation
- 当前专利权人地址: US CO Boulder
- 主分类号: G01B9/02
- IPC分类号: G01B9/02 ; G01J9/02 ; G01M11/00
摘要:
The invention allows for the accurate, real-time readout of the optical frequency of a swept-wavelength laser device by counting the number of fringes of a calibrated etalon that occur as the laser is swept. The distinguishing feature of the present invention is that the etalon fringe signal is phase-locked to a slave signal of a higher multiple frequency. The higher frequency of the slave signal divides the frequency interval of the etalon fringe spacing by the additional frequency multiple. The slave signal therefore generates a scale for optical frequency that is of higher resolution than possible with the etalon alone. The phase-lock also insures that the slave signal tracks monotonic scans of the optical frequency regardless of scan profile.The invention also allows for the precise, real-time control of the optical frequency of a laser during the sweep of the laser. By comparing a signal proportional to the transmission of light through a calibrated Fabry-Perot etalon to a reference control signal, the phase difference between etalon transmission signal and the reference signal may be fed back to the laser to drive the phase difference to zero (phase-lock). The phase-lock ensures that the optical frequency profile of the sweep follows exactly the frequency profile of the reference signal. Tailoring the input reference signal controls the velocity of the optical-frequency sweep.
公开/授权文献
- US2573442A Circuit integrity indicating system 公开/授权日:1951-10-30