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    • 8. 发明授权
    • Device for source compensating a fiber optic coupler output
    • 用于源补偿光纤耦合器输出的装置
    • US5054878A
    • 1991-10-08
    • US533186
    • 1990-06-04
    • John S. GergelyWilbur J. Myers
    • John S. GergelyWilbur J. Myers
    • G02B6/42
    • G02B6/4206G02B6/4296
    • A device for source compensating a fiber optic coupler output automatically compensates for changes in light intensity at the output end of the fiber caused by changes in light intensity from the source, beam walking at the input of the fiber and mode changes in the fiber. Laser light enters a frequency doubler and exits as a doubled frequency output which is focused onto the input face of a fiber optic cable by a lens. The lens is selected so that the spot size of the focused light on the face of the fiber is smaller than the diameter of the fiber and that the entry angle of the light cone is within the acceptance angle of the fiber. The fiber is tightly wound into a mode scrambler to provide a uniform intensity distribution of the light exiting the fiber. The light leaving the fiber is collimated and directed to additional optical elements. The collimated beam is directed to a beam splitter which reflects 8% of the incident beam to a calibrated photodiode that is terminated with a transimpedance amplifier. The light that transmits through the beam splitter can be focused onto the sample. To compensate for light fluctuations, the signal from the transimpedance amplifier is divided into the signal from the sample.
    • 用于源补偿光纤耦合器输出的装置自动补偿由光源的光强度的变化引起的光纤输出端的光强度的变化,光纤输入端的光束行进和光纤中的模式变化。 激光进入倍频器并作为双倍频率输出退出,该输出通过透镜聚焦在光纤电缆的输入面上。 选择透镜使得光纤表面上的聚焦光的光点尺寸小于光纤的直径,并且光锥的入射角在光纤的接受角度内。 光纤被紧密缠绕到模式扰频器中以提供离开光纤的光的均匀强度分布。 离开光纤的光被准直并定向到附加的光学元件。 准直光束被引导到分束器,其将8%的入射光束反射到用跨阻放大器端接的校准光电二极管。 通过分束器传输的光可以聚焦在样品上。 为了补偿光波动,来自跨阻放大器的信号被分为来自样品的信号。