| Zugriffsnummer | 16144 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Optical measurement of electric fields |
| Autor(in); Institution |
Steiger, Andreas; 7.201, Strahlergestützte Radiometrie optischer Strahlung, PTB-Berlin
de la Rosa, M. Inmaculada; Departamento de Óptika y Física Aplicada, Facultad de Ciencias, Valladolid, SPAIN
Pérez, Conceptión; Departamento de Óptika y Física Aplicada, Facultad de Ciencias, Valladolid, SPAIN
Gemišic' Adamov, Minja; 7.201, Strahlergestützte Radiometrie optischer Strahlung, PTB-Berlin
Grützmacher, Klaus; 7.201, Strahlergestützte Radiometrie optischer Strahlung, PTB-Berlin
Seidel, Joachim; 7.2, Hochtemperaturphysik und Vakuum, PTB-Berlin
|
| Quelle/Jahr | Optical measurement systems for industrial inspection III:(2003), 823 - 830 |
| Schriftenreihe | Proceedings of SPIE: 5144 |
| Herausgeber(in) |
Osten, Wolfgang
Creath, Katherine
Kujawinska, Malgorzata
|
| ISSN | 0277-786X |
| ISBN | 0-8194-5014-6 |
| Verlag | Bellingham, Wash.: SPIE |
| Konferenzangaben | Optical Measurement Systems for Industrial Inspection III, Munich, 23-26 June 2003, Germany |
| Freie Schlagworte | plasma diagnostics ; two-photon spectroscopy ; Stark-splitting ; atomic hydrogen ; UV laser spectrometer |
| Zusammenfassung | 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 an 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. |
