Laser system for imaging and materials analysis

US10180397B2 · kind B2 · utility

Assignees

• The University Of Queensland · AU
• University of Leeds · GB

Inventors

• Aleksandar D. Rakic · Echunga, AU
• Paul Dean · Cuyahoga Falls, US
• Alexander Giles Davies · Cambridge, GB
• Dragan Indjin · Heysham, GB
• Edmund Linfield · Cambridge, GB
• Stephen James Wilson · Northampton, GB
• Thomas Taimre · Brisbane, AU
• Karl Bertling · Brisbane, AU
• Yah Leng Lim · Echunga, AU

Key dates

• Filing date: Aug 22, 2014
• Grant date: Jan 15, 2019
• Expiry date: Sep 17, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/12
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A THz quantum cascade laser is used to investigate a target by directing a first beam of laser radiation from the laser at the target to thereby produce a second beam of laser radiation by interaction of the first beam with the target. Self-mixing of the first and second beams occurs within the laser and causes variations in a signal such as the operating voltage of the laser. An operating parameter of the laser that affects the interaction of the first beam with, the target is varied. The operating voltage is monitored and processed to determine phase and amplitude changes associated with material properties of the target. Consequently in one embodiment the invention provides for processing the variations in the signal to produce various images of the target.