Full-field swept source optical coherence tomography using an acousto-optically tuned external-cavity laser diode is proposed and demonstrated. The wavelength of the light source is controlled by diffraction in an acousto-optic modulator, instead of by mechanical motion. This allows tuning rates of over 100 kHz without mode hopping. For phase analysis, we used a continuous wavelet transform. This allows for accurate signal processing that reduces calculation error caused by the nonstationary features of an interference signal. We measured the two-dimensional thickness distribution of a thin glass plate. The average thickness of the glass plate was found to be 152.2 μm.

Date Published: 20 December 2019
PDF: 8 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120922 (20 December 2019); doi: 10.1117/12.2547786

Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)