17-21 June 2007 ECBO 2007 Munich, Germany Static depth dependent dispersion compensation in a real-time static delay line grating-based correlation OCT system L. Froehly, P. Sandoz, L. Furfaro, M.Ouadour Institut FEMTO-ST; Département d’Optique P.M. Duffieux Besançon, France
Static depth dependent dispersion compensation in a real-time static delay line grating-based correlation OCT system. L. Froehly, P. Sandoz, L. Furfaro, M.Ouadour Institut FEMTO-ST; Département d’Optique P.M. Duffieux Besançon, France. 100 m m. Dispersion problem in OCT. - PowerPoint PPT Presentation
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
17-21 June 2007 ECBO 2007 Munich, Germany
Static depth dependent dispersion compensation in a real-time static delay line
grating-based correlation OCT system
L. Froehly, P. Sandoz, L. Furfaro, M.Ouadour
Institut FEMTO-ST; Département d’Optique P.M. Duffieux Besançon, France
17-21 June 2007 ECBO 2007 Munich, Germany
Dispersion problem in OCT
100m
•Dispersion limits axial resolution
•Dispersion depends on the material thickness
•Dispersion decreases the Signal to Noise ratio
tseS TFenc
j'
12
m1
m13
17-21 June 2007 ECBO 2007 Munich, Germany
Hardware correction
S.L.S.
M1
S1O1
O2
17-21 June 2007 ECBO 2007 Munich, Germany
Hardware correction (rapid scanning delay line)
K. F. Kwong, D. Yankelevich, K. C. Chu, J. P. Heritage, and A. Dienes, Opt. Lett. 18, 558- (1993) ->first demonstration for pulse measurements
Rollins, S. Yazdanfar, M. Kulkarni, R. Ung-Arunyawee, and J. Izatt, Rollins, S. Yazdanfar, M. Kulkarni, R. Ung-Arunyawee, and J. Izatt, Opt. Express 3, 219-229 (1998)Opt. Express 3, 219-229 (1998)
G. J. Tearney, B. E. Bouma, and J. G. Fujimoto, Opt. Lett. 22, 1811-1813 (1997) ->Application of the system to TD-OCT system
17-21 June 2007 ECBO 2007 Munich, Germany
Numerical correction
tIeeI
eItI
dTFjj
jTFd
c
1
•Phase correction in Fourier space•Influence of the phase correction on the image contrast
L. Froehly, M. Ouadour, L. Furfaro, P. Sandoz, T. Gharbi et al, Real-time optical coherence spectrotomography : proof of principle volume 6191 of Biophotonics and New Therapy Frontiers. SPIE, Apr. 2006.