Comparison of Physical and System Factors Impacting Hydration Sensing in Leaves Using Terahertz Time-Domain and Quantum Cascade Laser Feedback Interferometry Imaging [PDF]
Sensors, 2023 To reduce the water footprint in agriculture, the recent push toward precision irrigation management has initiated a sharp rise in photonics-based hydration sensing in plants in a non-contact, non-invasive manner.
Khushboo Singh +11 more
doaj +4 more sources
Coherent terahertz laser feedback interferometry for hydration sensing in leaves [PDF]
Optics Express, 2023 The response of terahertz to the presence of water content makes it an ideal analytical tool for hydration monitoring in agricultural applications. This study reports on the feasibility of terahertz sensing for monitoring the hydration level of freshly harvested leaves of Celtis sinensis by employing a imaging platform based on quantum cascade lasers ...
Mayuri Kashyap +17 more
core +7 more sources
Laser feedback interferometry and applications: a review [PDF]
Optical Engineering, 2017 The progress on laser feedback interferometry technology is reviewed. Laser feedback interferometry is a demonstration of interferometry technology applying a laser reflected from an external surface, which has features including simple structure, easy alignment, and high sensitivity.
Yanxiong Niu
exaly +3 more sources
Sensing and imaging using laser feedback interferometry with quantum cascade lasers [PDF]
Applied Physics Reviews, 2019 Quantum cascade lasers (QCLs) are high-power sources of coherent radiation in the midinfrared and terahertz (THz) bands. Laser feedback interferometry (LFI) is one of the simplest coherent techniques, for which the emission source can also play the role of a highly-sensitive detector.
Aleksandar D Rakic +2 more
exaly +7 more sources
Nanometric sensing with laser feedback interferometry
Optics Letters, 2019 We demonstrate a nanometric sensor based on feedback interferometry in a distributed feedback (DFB) laser by using a measurement of either the optical frequency or laser voltage. We find that in an optimal range of optical feedback, the sensor operates reliably down to an extrapolated 12 nm; for the sensor demonstrated here at ∼1550 nm, this provides ...
Daeyoung Choi +2 more
exaly +7 more sources
Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives [PDF]
Sensors, 2016 We propose a self-consistent method for the analysis of granular materials at terahertz (THz) frequencies using a quantum cascade laser. The method is designed for signals acquired from a laser feedback interferometer, and applied to non-contact ...
She Han +12 more
doaj +3 more sources
Publisher Correction: Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry. [PDF]
Sci Rep, 2018 A correction to this article has been published and is linked from the HTML and PDF versions of this paper.
Keeley J +11 more
europepmc +8 more sources
Terahertz radar cross‐section characterisation using laser feedback interferometry with quantum cascade laser [PDF]
Electronics Letters, 2015 Radar cross‐section (RCS) measurements of complex, large objects are usually performed on scale models so that the measurement is carried out in a well‐controlled environment. The feasibility of RCS measurement using a terahertz (THz) quantum cascade laser (QCL) via laser feedback interferometry is explored.
H.S. Lui +11 more
core +7 more sources
On Line Sensing of Ultrafast Laser Microdrilling Processes by Optical Feedback Interferometry [PDF]
Physics Procedia, 2013 The instantaneous measurement of both ablation front displacement and removal rate during ultrafast laser microdrilling is demonstrated by on line sensing technique based on optical feedback interferometry in both unipolar and bipolar semiconductor laser.
Antonio Ancona +2 more
exaly +6 more sources
Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers [PDF]
Optics Express, 2019 We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed THz QCL feedback interferometer permits both high peak powers and improved thermal efficiency, which enables the cryogen-free operation of the system.
Yah Leng Lim +12 more
core +8 more sources