1,721,044 research outputs found
Chemical sensing in the submillimeter wave regime
No full text© 2004 COPYRIGHT SPIE--The International Society for Optical EngineeringT-ray systems offer an exciting range of capabilities for chemical and biological diagnostics using the emerging technology of terahertz pulse imaging. We report results from the first Australian T-ray program and discuss how MOEMS techniques can be applied to decrease the system size. A small portable T-Ray system will cost less and is needed, for example, in endoscopic applications.Samuel P. Mickan, Xi-Cheng Zhang, Jesper Munch, and Derek Abbot
Suppression of self-pulsing behaviour in Tm:YAlO(3) lasers via pump diode-current feedback
No full textPaper C818Strong self-pulsation is inherent in Tm:YAlO 3 lasers, making them difficult to use. The suppression methods reported in literature use an intra-cavity AOM, which is not viable for high power operation. We demonstrate the first reported suppression of such self-pulsing in Tm:YAlO 3 using a feedback loop with current directly injected into the diode. © 2011 IEEE.Ka S. Wu, Jesper Munch, Peter J. Veitch, David J. Ottawa
Upconversion lasing for index sensing and strong amplitude modulation of WGMs in Er-Yb co-doped tellurite spheres
Full text linkWe fabricated Er-Yb codoped tellurite spheres for strong upconversion WGM lasing with Q up to 27,000 for 15μm diameter and achieved the index sensitivity of 8.8nm/RIU. Strong amplitude modulation in the modes was also observedYinlan Ruan, Keiron Boyd, Hong Ji, Heike Ebendorff-Heidepriem, Jesper Munch, and Tanya M. Monro
Noise reduction in terahertz thin film measurements using a double modulated differential technique
No full text© World Scientific Publishing CompanyDifferential terahertz (THz) time-domain spectroscopy (TDS) is a technique for decreasing noise levels in THz thin film characterization experiments. Characterizing thin films in the GHz to THz range is critical for the development of fast integrated circuits and photonic systems, and is potentially applicable to biosensors and proteomics. This paper shows how the differential technique, combined with double modulation, enables the study of thin films with noise reduction over normal TDS that improves at the film gets thinner. Double modulated differential THz-TDS has enabled the characterization of films with less than 1-μm thickness.Samuel P. Mickan, Derek Abbott, Jesper Munch and X.-C. Zhan
A 10W cw Nd:YAG laser for gravitational wave interferometry
No full textDavid Hosken, Damien Mudge, Peter Veitch, Jesper Munch, and Kohei Taken
10W Nd:YAG Laser for TAMA300
No full textDavid J. Hosken, Damien Mudge, Peter J. Veitch, Jesper Munch and Kohei Taken
New energy-transfer upconversion process in Er(3+):ZBLAN mid-infrared fiber lasers
Full text linkAbstract not availableOri Henderson-Sapir, Jesper Munch, and David J. Ottawa
Increased sensitivity in T-ray liquid spectroscopy using rapid sample modulation
No full text© 2004 COPYRIGHT SPIE--The International Society for Optical EngineeringPulsed THz (T-ray) spectroscopy is sensitive, non-invasive tool for studying materials from physics to biology, but transmission measurements of liquid samples, especially water, have been limited by noise. This paper shows that the accuracy of T-ray material parameter measurements of liquid samples can be greatly increased, especially for highly-absorbing liquids, by using a rapid modulation of the liquid in the T-ray beam path, coupled with a novel implementation of mean and amplitude detection to T-ray spectroscopy. The experiments are supported by calculations quantifying the sources of uncertainty. Liquid transmission T-ray studies are valuable for understanding solvation dynamics of salts, exploring long-range structure in mixtures and probing biomolecules in suspension.Samuel P. Mickan, Jesper Munch, Xi-Cheng Zhang, and Derek Abbot
Hartmann Wavefront Sensors for Advanced LIGO
No full textOSA Technical Digest (online) (Optical Society of America, 2018), paper SW3M.5.
From the session Beam Control & Measurement (SW3M)The operation and sensitivity of the Advanced LIGO gravitational wave detector are degraded by absorption-induced wavefront distortion. We describe the use of ultra-sensitive Hartmann wavefront sensors to tune detector operation and optimize sensitivity.Peter Veitch, Aidan Brooks, Won Kim, Carl Blair, Huy Cao, Greg Grabeel, Terra Hardwick, Matthew Heintze, Alastair Heponstall, Craig Ingram, Jesper Munch, David Ottaway and Thomas V
Label-free bioaffinity detection using terahertz technology
Full text link© 2002 IOP PublishingWe report the first use of differential terahertz time-domain spectroscopy for bioaffinity sensing. Binding is observed by measuring the transmission of a thin layer of biotin bound to the sensor protein avidin. We demonstrate the THz wave transmission of a sub-micron-thick film and sensitivity to 0.1 µg cm−2 of biotin. These results point the way for a host of biosensor applications using T-rays, or pulsed far-infrared (FIR) radiation.Samuel P Mickan, Abdellah Menikh, Haibo Liu, Carmen A Mannella, Robert MacColl, Derek Abbott, Jesper Munch and X-C Zhan
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