1,720,958 research outputs found
Laser operation of a Tm:Y<sub>2</sub>O<sub>3</sub> planar waveguide
No full textWe demonstrate the first Tm-doped yttria planar waveguide laser to our knowledge, grown by pulsed laser deposition. A maximum output power of 35 mW at 1.95 µm with 9% slope efficiency was achieved from a 12 µm-thick film grown on a Y3Al5O12 substrate
Diode-end-pumped 1.2W Yb:Y<sub>2</sub>O<sub>3</sub> planar waveguide laser
No full textFabrication, characterization and laser performance of a Watt level ytterbium-doped yttria waveguide laser is presented. The waveguide was grown onto a YAG substrate by pulsed laser deposition and features a 6 µm thick ytterbium-doped yttria layer sandwiched between two 3 µm undoped yttria layers. The laser deposited film was characterized by X-ray diffraction, showing a high degree of crystallinity and analyzed spectroscopically, showing performance indistinguishable from previously reported bulk material. When pumped with 8.5 W from a broad area diode laser the waveguide laser produces 1.2 W of output at 1030 nm
An 11.5 W Yb:YAG planar waveguide laser fabricated via pulsed laser deposition
No full textWe present details of the homo-epitaxial growth of Yb:YAG onto a <100> oriented YAG substrate by pulsed laser deposition. Material characterization and initial laser experiments are also reported, including the demonstration of laser action from the 15 µm-thick planar waveguide generating 11.5 W of output power with a slope efficiency of 48%. This work indicates that under appropriate conditions, high-quality single-crystal Yb:YAG growth via pulsed laser deposition is achievable with characteristics comparable to those obtained via conventional crystal growth techniques
Pulsed laser deposited diode-pumped 7.4 W Yb:Lu<sub>2</sub>O<sub>3</sub> planar waveguide laser
No full textFabrication, characterization, and laser performance of an Yb:Lu2O3 planar waveguide laser are reported. Pulsed laser deposition was employed to grow an 8 µm-thick Yb-doped lutetia waveguide on a YAG substrate. X-ray diffraction was used to determine the crystallinity, and spectroscopic characterization showed the absorption and emission cross-sections were indistinguishable from those reported for bulk material. When end-pumped by a diode-laser bar an output power of 7.4 W was achieved, limited by the available pump power, at a wavelength of 1033 nm and a slope efficiency of 38% with respect to the absorbed pump power
A 11.5 W Yb:YAG planar waveguide fabricated via pulsed laser deposition
No full textDataset for the figures in Grant-Jacob, James A, Beecher, Stephen J, Parsonage, Tina L, Hua, Ping, Mackenzie, Jacob I, Shepherd, David P and Eason, Robert W (2015) An 11.5 W Yb:YAG planar waveguide laser fabricated via pulsed laser deposition. Optical Materials Express
Data collection method: Optical spectrum analyzer (Ando AQ6317).</span
Reflecting photonics: reaching new audiences through new partnerships – IYL 2015 and the Royal Horticultural Society Flower Show
Full text linkThe ‘Reflecting Photonics’ show garden was exhibited at the 2015 Royal Horticultural Society (RHS) Flower Show in Tatton Park, UK, to celebrate the International Year of Light and Light-based Technologies. Elks-Smith Garden Design alongside landscapers ‘Turf N’ Earth’ collaborated with researchers, marketing and outreach professionals from the University of Southampton to design, construct and exhibit a photonics-themed garden. The garden and supporting exhibition united science and art to reach new audiences – particularly family groups alongside other key influencers to the young – and showcased the world-leading research in optical fibers at the university in an accessible manner. Researchers and a publicity professional, funded by the EPSRC Centre for Innovative Manufacturing in Photonics, developed an integrated approach to the event’s public engagement and marketing. The overarching aim was to influence a positive change in the attitude of the garden visitors towards physics and photonics, with additional focus on promoting careers for women in STEM. The show garden won an RHS Gold Medal award and the coveted ‘People’s Choice Award’ for the best large garden. The project subsequently won the South East England Physics Network Public Engagement Innovation Project Award. Approximately 80,000 visitors saw the garden, with a further three million television viewers on a popular British gardening show. There were also over 75,400 Tweet impressions on social media. This paper discusses the project aims, explores the design of the garden and its relationship with the research, describes the work of the public engagement team, and outlines the impact of the event
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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