We report on recent development of the Cavity Enhanced Thomson Scattering (CETS) diagnostic, which is based on using high intra-cavity beams, within a high-finesse cavity, as a scattering source. The implementation of a high power 5.3 W continuous-wave fiber laser system has resulted in intra-cavity powers of 3.2 kW, substantially higher than what has been obtained in past work. Data is presented demonstrating the linear scaling of scattering signal strength with incident laser power as well as rotational Raman spectra in laboratory air. The addition of new optical components, reconfiguration of the beam line, and initial cavity locking results in the plume of a BaO hollow cathode are presented. Application of the CETS technique to electric propulsion devices is discussed.
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