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A streak camera based fiber optic pulsed polarimetry technique for
magnetic sensing to sub-mm resolution
K. H. Burrell, T. E. Evans, E. J. Doyle, M. E. Fenstermacher, R. J. Groebner, A. W. Leonard, R. A. Moyer, T. H. Osborne, M. J. Schaffer, P. B. Snyder et al., Plasma Phys. Controlled Fusion 47(12B), B37 (2005).
C. B. Forest, K. Flanagan, M. Brookhart, M. Clark, C. M. Cooper, V. Désangles, J. Egedal, D. Endrizzi, I. V. Khalzov, H. Li et al., J. Plasma Phys. 81(05), 345810501 (2015).
M. J. Rosenberg, C. K. Li, W. Fox, I. Igumenshchev, F. H. Séguin, R. P. J. Town, J. A. Frenje, C. Stoeckl, V. Glebov, and R. D. Petrasso, Nat. Commun. 6, 6190 (2015).
D. H. Goldstein, Polarized Light (CRC press, 2010).
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The technique of fiber optic pulsed polarimetry, which provides a distributed
(local) measurement of the magnetic field along an
fiber, has been improved to the point where, for the first time,
photocathode based optical detection of backscatter is possible with sub-mm spatial resolutions. This
has been realized through the writing of an array of deterministic fiber Bragg
gratings along the fiber, a so-called backscatter-tailored
fiber, producing a 34 000-fold increase in backscatter levels over
Rayleigh. With such high backscatter levels, high repetition rate lasers are now
sufficiently bright to allow near continuous field sensing in both space and time
with field resolutions as low as 0.005 T and as high as 170 T over a ∼mm interval
given available fiber materials.
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