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8 September 2004 Terahertz emission, detection, and military applications
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We review the current status of terahertz technologies, especially terahertz beam generators and detectors, which include those being developed in our laboratory. Of the many promising terahertz technologies, only a few may currently be suitable for military applications in the field, which require a high-power terahertz output and a high sensitivity in detection. In addition to these requirements, terahertz imaging for military applications demands focal-plane-arrayed detectors. Presently we are developing a terahertz source based on a modified difference-frequency technique, in which we employ an optical parametric method. We used a Nd:YAG Q-switched laser as a pump source, and LiNbO3 and GaSe crystals as the optical parametric medium. The phase matching condition is achieved by means of our new electro-optical tuning technique. Our preliminary experiments indicate that the new tuning technique enhances the terahertz-beam output power. Although the output power is currently unstable, our source can produce terahertz peak power as high as a few watts. For terahertz detection we use a Si-bolometer or an electro-optic (EO) detector. In addition to these sensors we are presently developing a new detector based on a quantum dot structure. The sensitivity of the quantum dot detector is expected to be about 10-21 W/(Hz)1/2 in terms of the noise equivalent power (NEP); this is orders of magnitude better than the sensitivity of our bolometer (10-13 W/(Hz)1/2) at 4.2 K or our EO detector (10-12 W/(Hz)1/2) at room temperature.
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Dong Ho Wu and Jerry R. Meyer "Terahertz emission, detection, and military applications", Proc. SPIE 5411, Terahertz for Military and Security Applications II, (8 September 2004);

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