Experimental study on the performances of second-harmonic dispersion interferometers at 10.6 μm and 1064 nm for plasma density measurements
Anno: 2020
Autori: Brandi F., Frank Wessel, Christopher M. Lohff, James R. Duff, Zachary O. Haralson
Affiliazione autori: L Egant Solut LLC, 22 Santa Eugenia, Irvine, CA 92606 USA; SS Pisa, Ist Nazl Ott CNR INO, Via Moruzzi 1, I-56124 Pisa, Italy; Lockheed Martin Aeronaut Co, 1011 Lockheed Way, Palmdale, CA 93599 USA.
Abstract: Two common-path interferometers based on CO 2 and Nd:Y 3 Al 5 O 12 (Nd:YAG) lasers are benchmarked with a
two-arm microwave interferometer on a hydrogen plasma produced by an RF discharge and injected into a large
magnetic-confinement vessel. The ∼10 19 m −2 line-integrated electron density is clearly measured in agreement
by the interferometers. The frequency spectrum of the measured data is analyzed on the 20 kHz range for all inter-
ferometers and up to 600 kHz for the Nd:YAG laser-based interferometer. Mechanical vibration measurements
performed on the components of the two common-path interferometers result in a peak-to-peak displacement
up to about one and twenty wavelengths for the CO 2 and Nd:YAG laser-based interferometers, respectively. Such
results set for the first time, to the best of our knowledge, a quantitative limit for the displacement that the two
second-harmonic dispersion interferometers can sustain while still providing a high sensitivity for accurate plasma
density measurements.
Giornale/Rivista: APPLIED OPTICS
Volume: 59 (n.27) Da Pagina: 8486 A: 8493
Parole chiavi: plasma diagnostics, interferometryDOI: 10.1364/AO.399551Citazioni: 4dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-06-29Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui