Faraday rotation in a multimode optical fiber in a fast rise-time, high magnetic field

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138692· OSTI ID:5425300

Wessel, F J; Wild, N C; Fisher, A; Rahman, H U; Ron, A; Felber, F S

A magneto-optic Faraday rotation diagnostic was implemented on a Z-italic-pinch driven flux-compression generator to measure line-averaged, megagauss, axial-magnetic fields up to 1.6 MG with rise times of 30 kG/ns. The axial-magnetic field rotated the plane of polarization of a 2-W argon laser beam in a 0.725-mm-diam, fused silica quartz fiber mounted coaxial with the Z-italic pinch. The rapid rise time and the high radiation environment presented by the Z-italic-pinch plasma caused a high-pressure impulse <100 kbar, to be coupled into the quartz-fiber probe disrupting the polarization-preserving properties of the fiber. The time scale for disruption was characteristic of a shock propagating radially through the fiber to its core. This paper will describe the response of the Faraday diagnostic under these conditions and present a simple model that describes the effects of fiber depolarization that is consistent with previous observations of stress-induced depolarization in optical fibers.

• Research Organization: JAYCOR, P. O. Box 85154, San Diego, California 92138-9259
• OSTI ID: 5425300
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 57:9
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LINEAR Z PINCH DEVICES
MAGNETIC FIELDS
PLASMA DIAGNOSTICS
OPTICAL FIBERS
DEPOLARIZATION
FARADAY EFFECT
PULSE RISE TIME
SHOCK WAVES
STRESSES
FIBERS
LINEAR PINCH DEVICES
OPEN PLASMA DEVICES
PINCH DEVICES
THERMONUCLEAR DEVICES
TIMING PROPERTIES
700102* - Fusion Energy- Plasma Research- Diagnostics