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Type: Artigo de evento
Title: Imaging At 0.2 And 2.5 Terahertz
Author: Melo A.M.
Toledo M.A.P.
Maia F.C.B.
Rocha A.
Plotegher M.B.
Pereira D.
Cruz F.C.
Abstract: We report the development and initial results of two Terahertz imaging systems based on monochromatic sources at 0.2 and 2.52 THz. The first is based on a microwave oscillator, whose frequency is multiplied to 0.2 THz, used in conjunction with a zero-bias detector. The sample is scanned across the beam, and transmission images are obtained after processing. The second system allows real-time images, and consists of a methanol gas laser emitting at 119 microns (2.52 THz) and a commercial camera based on a microbolometer array. We describe the construction and performance of the methanol laser and a tunable CO 2 laser, which emits 20 W at the 9P(36) pump line. Due to the high coherence of the laser, this system is particularly suited for diffraction and interference imaging. We have measured the absorption coefficients of a few samples assuming the Beer law. © 2013 Copyright SPIE.
Citation: Proceedings Of Spie - The International Society For Optical Engineering. , v. 8624, n. , p. - , 2013.
Rights: aberto
Identifier DOI: 10.1117/12.2002108
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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