THz measurements are usually performed in focused beam geometry while the standard extraction procedure of the sample refractive index assumes plane-wave approximation. We propose a new retrieval model for spatially limited Gaussian terahertz beams.
© 2011 OSA
C. Kadlec, H. Nemec, F. Kadlec, and P. Kuzel, "Terahertz spectroscopy with focused beams: Gouy shift correction for highly accurate refractive index retrieval," in CLEO:2011 - Laser Applications to Photonic Applications, OSA Technical Digest (CD) (Optical Society of America, 2011), paper JThB105.
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