Abstract

Fourier domain optical coherence tomography (FDOCT) is used to non-invasively measure properties of the hole pattern in microstructured fibers. Features in the FDOCT data are interpreted and related to the hole diameter and spacing. Measurement examples are demonstrated for three different fibers with one hole, three holes at the vertices of an equilateral triangle, and a full triangular lattice. These studies provide the first path to real time monitoring of microstructured fibers during their draw.

© 2005 Optical Society of America

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References

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  1. J. C. Knight, T. A. Birks, and P. S. J. Russell, Optics of Nanostructured Materials, chap. Holey Silica Fibers, pp. 39–71 (John Wiley Sons, Inc., 2001).
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    [CrossRef] [PubMed]

J. Opt. Soc. Am. B (1)

Opt. Express (2)

Opt. Lett. (3)

Rep. Prog. Phys. (1)

A. F. Fercher, W. Drexler, C. K. Hitzenberger, and T. Lasser, “Optical Coherence Tomography - Principles and Applications,” Rep. Prog. Phys. 66, 239–303 (2003).
[CrossRef]

Other (1)

J. C. Knight, T. A. Birks, and P. S. J. Russell, Optics of Nanostructured Materials, chap. Holey Silica Fibers, pp. 39–71 (John Wiley Sons, Inc., 2001).

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Figures (4)

Fig. 1.
Fig. 1.

Schematic of FDOCT experimental setup.

Fig. 2.
Fig. 2.

FFT for fiber with a single 8µm hole with peaks at A=530.8, B=702.1, C=721.1, & D=896.6µm. X-axis is the round trip optical distance from reference mirror.

Fig. 3.
Fig. 3.

FFTs recorded for the, (a) M, and (b) K, orientations of the holes with respect to the incident beam. In (a) the positions of the peaks are, S=608.3µm, A=839.8µm, B=856µm, X=868µm, C=877.2µm, and D=894.6µm. In (b) the peak positions are, S=487.7µm, A=709.7µm, C=730µm, D=744.2µm, E=755.4µm, and F=768.6µm. The insets show the various reflecting planes for the two orientations. The peaks arising from these planes are labeled accordingly. The x-axis is the round trip optical distance from the reference arm mirror.

Fig. 4.
Fig. 4.

(a) and (b): FFT for MOF (shown in inset of (a)) along diagonalM with the reference arm, (a) blocked (spectrogram shown in inset), and (b) unblocked. In (a) the first few peak locations are 11.0, 25.7, 39.0, 47.7, 61.3, 84.6, 112.4, 124.9, 135.8, 148.5, 172.2, 187.6, 202.1, 213.4, 225.7, 235.9, 248.5, 271.6, and 286.1 µm. In (b) the distance of peaks from peak A are -186.3, 0, 18.8, 29.1, 41.3, 54.1, 65.6,78.4, 89.6, 104.1, 116.4, 130.0, 165.6, 177.9, 191.7, 222.8, 252.1 µm. (c): FFT along diagonal K of the MOF. The distance of peaks from A are -161.3, 0, 19.4, 35.0, 49.9, 72.6, 88.8, 120.6, 131.1, 158.5, 176.7, 189.9, 213.6, 227.1, 227.2, 254.7, 269.3, 284.7,300.7, 318.4, 337.6, 350.8, 390.1, 407.3, 422.1, 440.3, 458.8, and 503.7µm. X-axes are the round trip optical distance from the reference mirror. (d): Calculated and measured distance of peaks from peak A for FFT in (b).

Equations (3)

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I ( ν ) = I r + i I i + 2 I r i I i cos ( 2 π ν 2 d i c ) + 2 i I i j > i I j cos ( 2 π ν 2 ( d i d j ) c ) ,
T = 2 n [ Λ tan θ d 2 ( 1 cos θ ) ] ,
sin θ = 1 2 [ d 4 Λ ( d 4 Λ ) 2 + 2 ] .

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