ISSTT Proceedings

ISSTT Proceedings

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Measure the Beam Wavefronts of a Terahertz Source

Authors:
M. Cui, J.N. Hovenier, Y. Ren, J.R. Gao, and T.M. Klapwijk
Abstract:
Terahertz (THz) quantum cascade lasers (QCL) are one of the most promising THz sources as local oscillators (LO) for heterodyne receivers at super-THz frequencies. To effectively couple the radiation from a THz QCL to a lens-antenna-coupled THz mixer, which usually has a Gaussian beam pattern, understanding the beam pattern of the QCL is crucial. The beam pattern of a THz QCL with regard to the intensity has been studied extensively. However, the wavefront of the beam has never been measured. The latter can be more crucial for the use as a LO in a receiver because the mixer is a phase sensitive, coherent detector, Here we propose a measurement technique for the phase front in the THz domain by adapting the Shack-Hartmann wavefront sensors (SH-WFS) in the optical wavelengths. SH-WFS can provide accurate measurements of the wavefronts of beams. It is made of a panel of lens array, which creates a spot field from the incident wavefront on the detection plane, located at the focus plane of the lenses. The wavefront of the beam can be reconstructed from the locations of the spots.
Categories:
Poster Session, Miscellaneous
Year:
2011
Session:
PS
Full-text:
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Page Number(s):
71