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State-of-the-Art in cw Photomixing Systems

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Abstract

Frequency-domain terahertz techniques offer spectral selectivity, high resolution and excellent signal-to-noise ratios. Two-color distributed feedback (DFB) diode lasers now form the basis of compact and portable systems. Photomixers – photoconductors or fast p-i-n photodiodes – convert the optical beat signal of the two lasers into tunable, narrow-band terahertz radiation. Optimized laser tuning and data processing algorithms reduce the acquisition time for a complete spectrum from several hours to below 2 minutes.

This talk compares THz systems based on GaAs photomixer technology and recent developments using InGaAs/InP emitters and detectors. Selected application examples are presented.

© 2012 Optical Society of America

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