Improved common-path fast-scanning heterodyne interferometer system as potential dense-plasma diagnostics

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1786639· OSTI ID:20636641

Nam, Y U; Cheon, M S; Ha, J H; Hwang, Y S ^[1]

---

1. Department of Nuclear Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of)

An improved common-path fast-scanning heterodyne interferometer system has been developed. The mechanical vibration is one of the most critical error sources in typical interferometry system. These errors can be mostly eliminated in a common-path interferometry using a full common-mode rejection scheme. Taking advantage of it, the common-path interferometry is suitable for the measurements in noisy environments and can be applied even to the scanning interferometry. A prototype common-path interferometer system with He-Ne laser has been constructed with the capability of fast scanning by adding a rotating polygon mirror. A test of this system has been completed successfully by measuring the thickness profile of the scratched glass. In this study, the interferometer system is proposed and discussed as a potential density profile diagnostics for dense plasmas. By using a CO{sub 2} laser instead of a He-Ne laser, it may also be applied to get the time evolution of steep density profiles of plasma transport barriers in tokamak plasmas.

• OSTI ID: 20636641
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 75; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON DIOXIDE LASERS
ERRORS
GLASS
INTERFEROMETERS
INTERFEROMETRY
PLASMA DENSITY
PLASMA DIAGNOSTICS
REFRACTIVE INDEX
TOKAMAK DEVICES