1,721,039 research outputs found
Real-time measurements of endogenous CO production from vascular cells using an ultrasensitive laser sensor
No full textYuji Morimoto, William Durante, David G. Lancaster, Jens Klattenhoff, and Frank K. Titte
Modelling and fabrication of a leaky mode depressed clad Ho(3+) fiber
No full textThis work is an investigation of mode suppression in leaky mode fiber lasers. We present modelling and fabrication details for a depressed cladding holmium doped silica fiber.Sebastian W.S. Ng, David G. Lancaster, David J. Ottaway and Tanya M. Monr
Multi-point high temperature optical fiber sensor
Full text linkANZCOP, 2019, Melbourne, AustraliaAbstract not availableErik P. Schartner, Linh V. Nguyen, Dale Otten, Zheng Yu, David G. Lancaster, and Heike Ebendorff-Heidepriem, and Stephen C. Warren-Smit
Low-noise dual-comb platform based on mode-locked lasers in a multi-waveguide chip
No full textOSA Technical Digest (online) (Optical Society of America, 2018), paper SW4L.5. From the session NIR Dual Combs (SW4L)We analyze the frequency noise of a free-running dual-comb source based on twoadjacent waveguide lasers in the same glass chip. We demonstrate high rejection of environmentalnoise and an exceptionally low frequency noise floorNicolas Bourbeau Hébert, David G. Lancaster, George Y. Chen, and Jérôme Genes
High power 2-micrometers Tm3+-doped fibre lasers
No full textUsing Tm 3+-doped double-clad silica fibre we have produced high power, high efficiency 2μm lasers. To date we have achieved a 59% slope efficiency relative to launched pump power using single end pumping and double passing the pump light. By pumping the fibre laser from both ends, we achieved up to 118W peak output power with 54% slope efficiency relative to launched power at 25% duty cycle. The quantum efficiency of this laser was 120% relative to launched pump power, which we attribute to a cross-relaxation process in Tm 3+ ( 3H 4, 3H 6→ 3F 4, 3F 4). We have also demonstrated fixed wavelength operation of the laser near 1.9μm by using fibre Bragg gratings.Gavin P. Frith, David G. Lancaster and Stuart D. Jackso
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Extruded microstructured fiber lasers
No full textWe present the first fiber laser fabricated from an extruded microstructured preform. This laser is also, to the best of our knowledge, the first microstructured tellurite glass fiber laser. The threshold and efficiency of the 980 nm pumped, 1.5 μm erbium-doped tellurite laser were measured to be 1.5 mW and 13 % respectively.Michael R. Oermann, Heike Ebendorff-Heidepriem, David J. Ottaway, David G. Lancaster, Peter J. Veitch, and Tanya M. Monr
Towards distributed particle sensing using a few-mode exposed-core optical fibre with a spatially referenced evanescent field
No full textSession C4D_1We propose a two-dimensional distributed sensing scheme using few-mode exposed-core fibre and optical frequency domain reflectometry. This scheme aims to measure the size and position of particles using the evanescent field of different guided modes.Lu Peng, Linh Viet Nguyen, Nicolas Riesen, Jiawen Li, Dale Otten, David G. Lancaster, Robert A. McLaughlin, Heike Ebendorff-Heidepriem, and Stephen C. Warren-Smit
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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