Fast-Fourier-domain delay line for in vivo optical coherence tomography with a polygonal scanner.
We demonstrate in vivo optical coherence tomography using a Fourier-domain optical delay line constructed with a commercially available polygonal scanner. The 20-faceted polygonal mirror array, capable of scanning at rates up to 15 kHz, is implemented at 4 kHz to acquire 500 x 500 pixel images at 8 frames/s with a signal-to-noise ratio of 80 dB. Features of this delay line include scalability to high repetition rates, 98.6% linearity in group delay over 2 mm, and bandwidth support exceeding 150 nm. Images are obtained in an animal model (Xenopus laevis), and limitations due to phase-delay nonlinearity and polygon asymmetry are discussed.
Oldenburg
Amy L
AL
Department of Electrical and Computer Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 North Mathews, Urbana, Illinois 61801, USA.
Reynolds
J Joshua
JJ
Marks
Daniel L
DL
Boppart
Stephen A
SA
D000818:Animals; D005583:Fourier Analysis; D007814:Larva / Q000033:anatomy & histology; D055095:Optics and Photonics / Q000295:instrumentation*; D013997:Time Factors; D014054:Tomography / Q000295:instrumentation*; D014982:Xenopus laevis / Q000254:growth & development