Abstract

An orthogonal dispersive spectral-domain optical coherence tomography (SDOCT) system based on a spectrometer consisting of a high spectral resolution virtually-imaged phased array (VIPA) and a low resolution diffraction grating is developed. Two-dimensional (2D) dispersion generated by the combination of the VIPA and the grating in conjunction with a 2D CCD leads to an improved performance of the spectrometer. Ultrahigh spectral resolution of 0.002 nm within a free spectrum range of 50 nm is realized, providing the spectrometer with a spectral sampling rate up to 105. The developed SDOCT realizes an imaging depth over 80 mm, which is the longest depth range ever achieved by SDOCT. The increased spectral sampling rate also results in a high signal-to-noise ratio of the SDOCT system. The application of the developed system is further illustrated by quantitative phase imaging of a glass plate and an optical lens.

© 2012 Optical Society of America

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References

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2011 (1)

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

2009 (1)

2008 (1)

2007 (1)

S. A. Diddams, L. Hollberg, and V. Mbele, Nature 445, 627 (2007).
[CrossRef]

2006 (1)

2005 (2)

2004 (1)

1996 (1)

Bajraszewski, T.

Chen, Z.

Choma, M. A.

Costantino, S.

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

Creazzo, T. L.

Diddams, S. A.

S. A. Diddams, L. Hollberg, and V. Mbele, Nature 445, 627 (2007).
[CrossRef]

Dion, C.

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

Ellerbee, A. K.

Hollberg, L.

S. A. Diddams, L. Hollberg, and V. Mbele, Nature 445, 627 (2007).
[CrossRef]

Huber, R.

Izatt, J. A.

Kowalczyk, A.

Lesk, M. R.

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

Mbele, V.

S. A. Diddams, L. Hollberg, and V. Mbele, Nature 445, 627 (2007).
[CrossRef]

Ozaki, T.

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

Pan, Y.

Rao, B.

Shirasaki, M.

Singh, K.

K. Singh, C. Dion, M. R. Lesk, T. Ozaki, and S. Costantino, Rev. Sci. Instrum. 82, 023706 (2011).
[CrossRef]

Szkulmowska, A.

Szkulmowski, M.

Wang, H.

Wang, S.

Wang, Z.

Weiner, A.

Wojtkowski, M.

Xiao, S.

Yang, C.

Yu, L.

Yuan, Z.

Zhang, J.

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Figures (4)

Fig.1.
Fig.1.

(a) Schematic of the ultralong-range SDOCT system based on a VIPA-grating spectrometer and (b) distribution of peak positions for spectrum ranging from 810 to 860 nm on the 2D CCD.

Fig. 2.
Fig. 2.

(a) 2D spectra recorded on the CCD and an enlarged view of the boxed area corresponding to imaging depth of 81.87 mm. (b) 1D interference spectral signal retrieved from (a). (c) Three reconstructed depth profiles for imaging depths of 3.60, 43.22, and 81.87 mm, and the fitted SNR drop-off profile.

Fig.3.
Fig.3.

Probability distribution of measured phase variations with a glass plate as the sample.

Fig. 4.
Fig. 4.

(a) Three dimensional phase image of a glass plate and (b) cross-sectional phase image of an optical lens.

Equations (3)

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ICCD(x,y,λ)Iinterference(λ)·exp(2fc2y2f2W2)·1(1Rr)2+4Rrsin2(πΔλ)·exp((xλ0f(λλ0)/dcos(θg)fλ/πW)2),
Δ=2ntcos(θin)2ttan(θin)cos(θi)yftcos(θin)y2nf2
δλVIPA=λ022πtncos(θi)1RrRr

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