Optical measurement of electric fields

Andreas Steiger; M. Inmaculada de la Rosa; Conception Perez; Minja Gemisic; Klaus Gruetzmacher; Joachim Seidel

doi:10.1117/12.500082

30 May 2003 Optical measurement of electric fields

Andreas Steiger, M. Inmaculada de la Rosa, Conception Perez, Minja Gemisic, Klaus Gruetzmacher, Joachim Seidel

Proceedings Volume 5144, Optical Measurement Systems for Industrial Inspection III; (2003) https://doi.org/10.1117/12.500082
Event: Optical Metrology, 2003, Munich, Germany

Abstract

Local electric field strengths in low density plasmas can be measured directly by Doppler-free two-photon spectroscopy of atomic hydrogen mostly present in such discharges. This method is based on the Stark-splitting of the atomic resonance lines and causes no significant perturbation to the discharge. For this purpose, we take advantage of our advanced pulsed UV-laser spectrometers which provide not only the peak power needed for two-photon excitation but also the high spectral resolution to resolve the atomic hyperfine splitting. In a first experiment with opto-galvanic detection, atomic hydrogen was produced by thermal dissociation in a small cell filled with hydrogen gas and the Stark-splitting of the 1S-2S and the 1S-3S/D transition was measured. Electric fields as low as 200 V/cm and 30 V/cm respectively could be determined in accordance with theory. In addition, we have performed measurements in a hollow cathode discharge which provides higher electric fields in its cathode fall region and the 1S-2S spectrum was detected spatially resolved by means of opto-galvanic and polarization spectroscopy as well. Selected experimental results will be presented which clearly demonstrate the high potential of this optical method.

Citation Download Citation

Andreas Steiger, M. Inmaculada de la Rosa, Conception Perez, Minja Gemisic, Klaus Gruetzmacher, and Joachim Seidel "Optical measurement of electric fields", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); https://doi.org/10.1117/12.500082

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