TITLE

Two-color CO2 interferometer with single Bragg cell and improved vibration compensation at 3.39 μm

AUTHOR(S)
Innocente, P.; Martini, S.
PUB. DATE
August 1988
SOURCE
Review of Scientific Instruments;Aug1988, Vol. 59 Issue 8, p1571
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A single-chord CO[sub 2] (10.6-µm) He-Ne (3.39-µm) two-color laser interferometer which has been developed for the ETA-BETA II RFP machine is presented. Compared to the usual 0.633-µm vibration compensation systems, the 3.39-µm interferometer allows faster optical path-length variations to be measured without losing fringes, can stand larger angular deflections of the beams (e.g., due to vibrations of the optic mounts) without losing alignment, and uses the same acoustooptic modulator as the CO[sub 2] system, thus minimizing the differences in the optical path of the two interferometers. The instrument has been extensively utilized on ETA-BETA II, where line density variations larger than 10[sup 20] m[sup -2] and occurring in less than 4 µs can be routinely measured and the residual error after vibration compensation is ≈ 2 × 10[sup 18] m[sup -2]. Some further developments of the diagnostic are presented, which are presently underway or planned.
ACCESSION #
9781564

 

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