Our colleague Masahiro Yamanari recently reported a new polarization sensitive optical coherence tomography (PS-OCT) for retinal and choroidal imaging. This new PS-OCT utilized a probe beam with 1-micron wavelength enabled high-penetration to the choroid, and a full range measurement scheme based on the modulation of reference beam of OCT (BM-scan). This system enables detailed investigation of birefringence property of the deep posterior eye. After all, this OCT possesses a depth measurement range of 5.3 micrometers in air, a depth resolution of 11.4 micrometers in tissue, and a measurement speed of 30,000 depth-scan/sec. The intensity ratio between an OCT signal and its suppressed mirror signal was found to be 40.5 dB.
This PS-OCT is the first demonstration of 1-um PS-OCT with a clinically useful depth measurement range.
The details are available in the following Optics Express paper.
>> Full length article on Journal web site (open access)
Citation: M. Yamanari, S. Makita, Y. Lim, and Y. Yasuno, "Full-range polarization-sensitive swept-source optical coherence tomography by simultaneous transversal and spectral modulation," Opt. Express 18, 13964-13980 (2010).