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dc.contributor.authorBehnken, Barry
dc.contributor.authorKarunasiri, Gamani
dc.contributor.authorChamberlin, Danielle
dc.contributor.authorRobrish, Peter
dc.contributor.authorFaist, Jérôme
dc.date.accessioned2016-02-24T18:24:44Z
dc.date.available2016-02-24T18:24:44Z
dc.date.issued2008
dc.identifier.citationTerahertz Technology and Applications, edited by Kurt J. Linden, Laurence P. Sadwick, Proceedings of SPIE Vol. 6893, 68930L, (2008), 9 p.en_US
dc.identifier.urihttp://hdl.handle.net/10945/48011
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1117/12.767671en_US
dc.description.abstractReal-time imaging in the terahertz (THz) spectral range was achieved using a 3.6-THz quantum cascade laser (QCL) and an uncooled, 160x120 pixel microbolometer camera fitted with a picarin lens. Noise equivalent temperature difference of the camera in the 1-5 THz frequency range was calculated to be at least 3 K, confirming the need for external THz illumination when imaging in this frequency regime. After evaluating the effects of various operating parameters on laser performance, the QCL found to perform optimally at 1.9 A in pulsed mode with a 300 kHz repetition rate and 10-20% duty cycle; average output power was approximately 1 mW. Under this scheme, a series of metallic objects were imaged while wrapped in various obscurants. Single-frame and extended video recordings demonstrate strong contrast between metallic materials and those of plastic, cloth, and paper—supporting the viability of this imaging technology in security screening applications. Thermal effects arising from Joule heating of the laser were found to be the dominant issue affecting output power and image quality; these effects were mitigated by limiting laser pulse widths to 670 ns and operating the system under closed-cycle refrigeration at a temperature of 10 K.en_US
dc.description.sponsorshipThis work is supported by the Air Force Office of Scientific Research (AFOSR).en_US
dc.format.extent9 p.en_US
dc.publisherSPIEen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleOptimization of a 3.6-THz quantum cascade laser for real-time imaging with a microbolometer focal plane arrayen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentPhysicsen_US
dc.subject.authorTHzen_US
dc.subject.authorMicrobolometeren_US
dc.subject.authorUncooleden_US
dc.subject.authorQuantum cascade laseren_US
dc.subject.authorImagingen_US
dc.subject.authorDetectionen_US
dc.subject.authorCameraen_US
dc.subject.authorNETDen_US


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