Abstract
A simple method is demonstrated for internal intensity modulation of the 3.391 and 3.392-μm emissions of a He−Ne laser with equal amplitudes and 180° out of phase to each other. A modulation amplitude of 0.7 mW peak-to-peak at 1kHz for the individual emissions has been obtained from a laser plasma tube 50 cm long while maintaining the total-intensity modulation as low as 0.25 μW for a signal averaging time of 1 s. This laser source can greatly simplify the setup and improve the sensitivity of differential absorption measurements for the methane remote sensing.
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