Abstract
The low-frequency homodyne spectrum of the argon laser is known to contain a noise spectrum due to mode interactions, thus limiting the laser's use for low frequency Doppler shift measurements. Results are presented here for lasers of different constructions which show that under appropriate running conditions this noise spectrum may be suppressed. An anemometer based on the argon laser operating under optimum conditions has been developed, and results are presented of the heterodyne spectra from a fluid in both laminar and turbulent flow and the homodyne spectra of fluids in turbulent flow.
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