Diagnostic apparatus using terahertz radiation
US6605808B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2001 |
| Grant date | Aug 12, 2003 |
| Priority date | — |
| Expiry date | Dec 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/49
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A diagnostic apparatus including a terahertz generator taking the form of a femtosecond laser exciting either an optoelectric crystal of a photoconductive dipole antenna the terahertz radiation is directed onto a target preferably held close by or abutting an enclosure including a reflection receiving window and housing terahertz detector for detecting terahertz radiation. Preferably the terahertz radiation generator forms part of the receiving window. The enclosure has a modified atmosphere to permit ready transmission of terahertz radiation. A beam splitter is positioned between the laser and the terahertz generator to split off a probe laser beam from the terahertz inducing laser radiation which is also directed to the detector means. The output from the detector being determined by the amplitude of that part of the reflected teraherz radiation wave coaligned with the probe laser at the detector. A delay is positioned in the probe laser path to altering the length of the probe laser path over terahertz subwavelength distances so that different parts of the terahertz wave form can be interrogated by the probe laser to thereby ascertain the shape and dimensions of the reflected te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.