Abstract
A submillimeter heterodyne detector employing a laser as the local oscillator is reported. A description is given of the mixer and the diodes used in it. The detector was applied in low-level detection at 891 GHz using an HCN laser LO. The ninth harmonic of a 3 mm klystron obtained from a harmonic generator could be directly displayed on a scope. Evaluation of the noise equivalent power yielded values of 1.9×10−17 W/Hz. Application of an external bias reduced the required laser power from 30 mW to values below 10 mW.
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References
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