En-face OCT system at 1060 nm

Liviu Neagu; Antonio B. Lobo Ribeiro; Radu G. Cucu; Adrian Bradu; Lisha Ma; Adrian Gh. Podoleanu

doi:10.1117/12.822500

30 December 2008 En-face OCT system at 1060 nm

Liviu Neagu, Antonio B. Lobo Ribeiro, Radu G. Cucu, Adrian Bradu, Lisha Ma, Adrian Gh. Podoleanu

Proceedings Volume 7139, 1st Canterbury Workshop on Optical Coherence Tomography and Adaptive Optics; 71390B (2008) https://doi.org/10.1117/12.822500
Event: 1st Canterbury Workshop and School in Optical Coherence Tomography and Adaptive Optics, 2008, Canterbury, United Kingdom

Abstract

A highly efficient power optical coherence tomography configuration is implemented using a Multiwave Photonics broadband source centred at 1060 nm wavelength, FWHM = 50 nm and a Mach Zehnder interferometer. The interferometer contains a fibre acousto-optic modulator in each arm. One is driven at a fixed frequency of 40 MHz while the other via an RF Function Generation. In this way, the en-face OCT signal is modulated on a carrier frequency adjustable in the range 0 kHz to 1.5 MHz. A circulator is placed in the sample arm. Light retroreflected from the sample is sent via the circulator to a balanced coupler where it interferes with the reference beam. A translation stage is used in the reference arm to adjust the optical path difference in the interferometer. The result is photodetected using two InGaAs photodetectors followed by a differential amplifier in a balance detection configuration The system has been used to acquire en-face images as well as cross section optical coherence tomography images from skin and embryos based on T-scans (transversal reflectivity profiles).

Citation Download Citation

Liviu Neagu, Antonio B. Lobo Ribeiro, Radu G. Cucu, Adrian Bradu, Lisha Ma, and Adrian Gh. Podoleanu "En-face OCT system at 1060 nm", Proc. SPIE 7139, 1st Canterbury Workshop on Optical Coherence Tomography and Adaptive Optics, 71390B (30 December 2008); https://doi.org/10.1117/12.822500

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KEYWORDS

Optical coherence tomography

3D image processing

Photonics

Interferometers

Tissues

Bragg cells

Imaging systems

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