Heterodyne CO2‐laser interferometer with direct phase read‐out
A CO2‐laser interferometer with heterodyne detection has been built to measure electron line densities of plasmas in the range of 1018 to 5×1022 m−2. Heterodyne operation is accomplished by using two counteracting acousto‐optic modulators at a difference frequency of 500 kHz. A digital phase compara...
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| Veröffentlicht in: | Review of scientific instruments 1979-09, Vol.50 (9), p.1123-1124 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | A CO2‐laser interferometer with heterodyne detection has been built to measure electron line densities of plasmas in the range of 1018 to 5×1022 m−2. Heterodyne operation is accomplished by using two counteracting acousto‐optic modulators at a difference frequency of 500 kHz. A digital phase comparator is used to obtain direct read‐out of the phase shift. The time resolution is 3.5 μs. |
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| ISSN: | 0034-6748 1089-7623 |
| DOI: | 10.1063/1.1135997 |