23 February 2013 Terahertz quantum cascade laser based optical coherence tomography
Author Affiliations +
Abstract
The interfaces of a dielectric sample are resolved in reflection geometry using light from a frequency agile array of terahertz quantum-cascade lasers. The terahertz source is a 10-element linear array of third-order distributed feedback QCLs emitting at discrete frequencies from 2.08 to 2.4 THz. Emission from the array is collimated and sent through a Michelson interferometer, with the sample placed in one of the arms. Interference signals collected at each frequency are used to reconstruct an interferogram and detect the interfaces in the sample. Due to the long coherence length of the source, the interferometer arms need not be adjusted to the zero-path delay. A depth resolution of 360 μm in the dielectric is achieved with further potential improvement through improved frequency coverage of the array. The entire experiment footprint is <1 m x 1 m with the source operated in a compact, closed-cycle cryocooler.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alan W. M. Lee, Tsung-Yu Kao, Qing Hu, John L. Reno, "Terahertz quantum cascade laser based optical coherence tomography", Proc. SPIE 8585, Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications, 858508 (23 February 2013); doi: 10.1117/12.2001127; https://doi.org/10.1117/12.2001127
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

THz dual-band metasurfaces
Proceedings of SPIE (February 25 2016)
Full-field optical coherence microscopy
Proceedings of SPIE (July 29 2004)
Terahertz dielectric measurements of household powders
Proceedings of SPIE (September 26 2007)
Dielectric properties of GaAs in terahertz wave
Proceedings of SPIE (November 11 2008)
Improved dielectric mirrors for the THz frequency range
Proceedings of SPIE (April 19 2006)

Back to Top