Sensitive laser spectroscopy measurement system

摘要

A sensitive laser spectroscopy measurement system having a laser radiation source and a dual beam and detection scheme that allows for the measurement of small intensity differences between a probe beam and a reference beam resulting from the absorption, gain or scattering of the probe beam by a medium placed in its optical path. The system attains measurement sensitivities of less than 10-4 when the laser radiation source for the probe and reference beams is modulatable. Further included within the system is a prism placed in the optical path of the laser beam before the beam splits into the probe and reference beams and a detector for each beam. The detectors are electrically connected to a sensitivity differential amplifier and an oscilloscope for displaying the intensities of the beams.