Gary Agnew
University of Queensland
28 Papers
80 Citations
Gary Agnew is an academic researcher from University of Queensland. The author has contributed to research in topics: Terahertz radiation & Laser. The author has an hindex of 10, co-authored 26 publications.
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Papers
Determination of the gravitational constant at an effective mass separation of 22 m
G. I. Moore,Frank D. Stacey,G. J. Tuck,B. D. Goodwin,Nicholas P. Linthorne,M. A. Barton,D. M. Reid,Gary Agnew +7 more
TL;DR: Measurements from a vacuum balance that compares the weights of 10-kg stainless-steel masses suspended in evacuated tubes at different levels in a hydroelectric reservoir are used to measure the gravitational attractions of layers of lake water up to 10 m in depth, making it the largest-scale measurement of G using precisely controlled moving masses.
Observation of optical feedback dynamics in single-mode terahertz quantum cascade lasers: Transient instabilities
Xiaoqiong Qi,Karl Bertling,Thomas Taimre,Gary Agnew,Yah Leng Lim,Tim Gillespie,Ashley Robinson,Michael Brünig,Aleksandar Demić,Paul Dean,Lianhe Li,Edmund H. Linfield,A. Giles Davies,Dragan Indjin,Aleksandar D. Rakić +14 more
TL;DR: In this article, the authors provide experimental evidence of transient instabilities in a terahertz (THz) quantum cascade laser (QCL) under optical feedback, in contrast to the widely accepted claim that THz QCLs are ultrastable against feedback.
Laser feedback interferometry in multi-mode terahertz quantum cascade lasers.
Xiaoqiong Qi,Gary Agnew,Thomas Taimre,She Han,Yah Leng Lim,Karl Bertling,Aleksandar Demić,Paul Dean,Dragan Indjin,Aleksandar D. Rakić +9 more
TL;DR: The typical modal characteristics arising during laser feedback interferometry (LFI) in multi-mode terahertz (THz) quantum cascade lasers (QCLs) are investigated and the dependence of the aforementioned mapping of these three regimes on the linewidth enhancement factor of the laser is explored, which provides a systematic picture of the potential of LFI inMulti-mode THz QCLs for spectroscopic sensing applications.
20
Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer
Xiaoqiong Qi,Gary Agnew,Iman Kundu,Thomas Taimre,Yah Leng Lim,Karl Bertling,Paul Dean,Andrew Grier,Alexander Valavanis,Edmund H. Linfield,A. Giles Davies,Dragan Indjin,Aleksandar D. Rakić +12 more
TL;DR: A multi-spectral laser feedback interferometry system based on such a coupled-cavity THz QCL will permit ultra-high-speed sensing and spectroscopic applications including material identification.
17
Frequency Tuning Range Control in Pulsed Terahertz Quantum-Cascade Lasers: Applications in Interferometry
Gary Agnew,Andrew Grier,Thomas Taimre,Karl Bertling,Yah Leng Lim,Zoran Ikonic,Paul Dean,Alexander Valavanis,Dragan Indjin,Aleksandar D. Rakić +9 more
TL;DR: In this paper, the authors demonstrate that by appropriate manipulation of the drive pulse, they can not only obtain a higher optical output at increased operating temperature but also both extend and linearize a terhertz quantum cascade-laser's frequency sweep.