Laser power and stability

Higher laser power is preferred since acquisition time (signal strength) is directly related to laser power for a given system. Lower-power lasers are used when samples are not suitably robust or for budget considerations. The maximum sampling rate in a process application is limited by acquisition time, which depends on the molecule s Raman 

Fiber-optic cables up to approximately 100 meters connect each measurement point to the instrument. The cables typically contain four single fibers a primary pair with one to carry laser light to the sample and another to return the Raman signal to the spectrometer, and a spare pair. If a fiber is broken, fight will not reach the sample and the spare fiber must be used instead. 

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