| Full text | |
| Author(s): |
Melo, Arline M.
;
Toledo, Mauricio A. P.
;
Maia, Francisco C. B.
;
Rocha, Andre
;
Plotegher, Matheus B.
;
Pereira, Daniel
;
Cruz, Flavio C.
;
Sadwick, LP
;
OSullivan, CM
Total Authors: 9
|
| Document type: | Journal article |
| Source: | TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS VI; v. 8624, p. 6-pg., 2013-01-01. |
| 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 CO2 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. (AU) | |
| FAPESP's process: | 06/53713-0 - Development of powerful lasers and precision spectroscopy in imprisoned ultra-cool atoms |
| Grantee: | Daniel Pereira |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 05/51689-2 - Optics and Photonics Research Center at UNICAMP |
| Grantee: | Hugo Luis Fragnito |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |