A new method for determining the plasma electron density using optical frequency comb interferometer

Hiroyuki Arakawa; Hiroshi Tojo; Hajime Sasao; Yasunori Kawano; Kiyoshi Itami

doi:10.1063/1.4870925

A new method for determining the plasma electron density using optical frequency comb interferometer

Rev Sci Instrum. 2014 Apr;85(4):043508. doi: 10.1063/1.4870925.

Authors

Hiroyuki Arakawa¹, Hiroshi Tojo¹, Hajime Sasao¹, Yasunori Kawano¹, Kiyoshi Itami¹

Affiliation

¹ Japan Atomic Energy Agency, 801-1 Mukoyama, Naka-shi, Ibaraki 311-0193, Japan.

PMID: 24784608
DOI: 10.1063/1.4870925

Abstract

A new method of plasma electron density measurement using interferometric phases (fractional fringes) of an optical frequency comb interferometer is proposed. Using the characteristics of the optical frequency comb laser, high density measurement can be achieved without fringe counting errors. Simulations show that the short wavelength and wide wavelength range of the laser source and low noise in interferometric phases measurements are effective to reduce ambiguity of measured density.