5,981 research outputs found
Dataset for support of thesis 'Development of Short-wave Infrared Fibre Lasers'
No full textThis dataset supports the University of Southampton Doctoral Thesis "Development of Short-wave Infrared Fibre Lasers".
This dataset contains:
Slope efficiencies and M2 for the key results presented in the thesis, raw data supporting the measurement of aluminium reflectivity, fibre design data
such as refractive index profiles and bend loss values determined in Optifiber, and data supporting the fabrication of a CMS
Associated publications:
M. Burns, P. Shardlow, T. Jefferson-Brain, P. Barua, J. Sahu, W. Clarkson, '47 W Continuous-wave 1726~nm thulium fiber laser core-pumped by an erbium fiber laser,' Optics Letters, vol. 44, no. 21, pp. 5230-5233, 2019.
M. Burns, P. Shardlow, W. Clarkson, 'Widely-tunable operation of a thulium doped fiber laser between 1654~nm and 2025~nm', CJ-7.4, CLEO Europe, 2021.
M Burns, P. Shardlow, P. Barua, T Jefferson-Brain, J. Sahu, W. Clarkson, '47~W 1726~nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser', 112600G, SPIE Photonics West, LASE, 2020.
M. Burns, P. Shardlow, P. Barua, T. Jefferson-Brain, J. Sahu, W. Clarkson, 'Thulium-doped Fibre Laser with 25 W Single-mode Output at 1726 nm', CJ\_1\_2, CLEO Europe, 2019.
M. Burns, P. Shardlow, P. Barua, T. Jefferson-Brain, J. Sahu, W. Clarkson, 'High power 1726nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser', 108970O, Photonics West, 2019.
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Interview with Christopher Clarkson by Miha Zor. Arts Humana. National Radio of Slovenia
No full textThe following interview with Christopher Clarkson was recorded during his visit to Ljubljana in 2008. Most of his time was spent leading a workshop in the National Archive of Slovenia, and he also delivered a public lecture in the Department for Art History at the Faculty of Arts, University of Ljubljana. Miha Zor worked as a journalist in the cultural programme of the National Radio of Slovenia at that point and invited Clarkson to be the guest of the programme Ars Humana, where this interview with him – in Slovene translation – aired on 24th of November 2008. </p
Thomas Clarkson Papers
No full textThomas Clarkson (b. 1760 d. 1846) was a renowned English abolitionist who spent his adult life fighting to end slavery. As a leader in the British anti-slavery society, Clarkson was instrumental in getting the English Parliament to ban the slave trade in 1807 and to abolish the institution of slaver in 1833. The majority of this small collection is comprised of correspondence from Thomas Clarkson and his wife, Catherine, to her father, William Buck. Notable writings by Clarkson include the original essay An Liceat Nolentes In Servitutom Dare? [Is It Lawful to Make Slaves of Others Against Their Will?]. This essay, written in Latin, won the Chancellor's Prize at Cambridge College, England in 1785 and served as the basis for the expanded work, Essay on the Slavery and Commerce of the Human Species, Particularly The African published in 1786.
At the AUC Robert W. Woodruff Library we are always striving to improve our digital collections. We welcome additional information about people, places, or events depicted in any of the works in this collection. To submit information, please contact us at [email protected]
Ultra-low feedback fibre end termination geometry for high power fibre source applications
No full textOptical fibre end termination techniques are very important in the development of fibre-based optical communication systems and high-power fibre sources in laser, amplifier and superfluorescent configurations. There are many situations where unwanted optical feedback from a fibre end-facet can be very detrimental to the performance of the fibre source. For example, in laser configurations in which an external cavity is employed to extend the functionality (e.g. for Q-switching, mode-locking or wavelength tuning), then feedback from the fibre end-facet adjacent to the external cavity will compete with the feedback provided by the external cavity itself and hence may impact adversely on the laser output characteristics
‘Wisselbare Woorde’
No full textCarrol Clarkson’s chapter wrestles with the contentious question of Coetzee’s relation to the Black Consciousness Movement in South Africa of the 1970s and early 1980s, which took its philosophical bearings from Frantz Fanon and found expression in the writings of Steve Biko. Clarkson focuses on the ways in which Coetzee departed from the ideas about writing and resistance that were circulating in his contemporary South Africa, particularly as articulated by novelist Nadine Gordimer. Clarkson discusses two related literary-critical problems: an ethics and politics of representation, and an ethics and politics of address, showing how Coetzee explores a tension between freedom of expression and responsibility to the other. In the slippage from saying to addressing we are led to further thought about modes and sites of consciousness—and hence accountabilities—in the interlocutory contact zones of the post-colony. The chapter invites a sharper appreciation of what a postcolonial philosophy might be.</p
Pattern and process of vegetation change (succession) in recent volcanic landscapes of New Zealand and Hawaii
No full textVolcanic activity (including lava flows, debris flows and tephra eruptions) is a regular feature of many landscapes of the North Island of New Zealand and the Hawaiian archipelago. Over the last 35 years, we have been using a combination of the chronosequence and direct monitoring methodologies (Clarkson 1998; Walker et al. 2010) to research the pattern and process of vegetation change (succession) in these landscapes. The following account summarizes pattern and process from our main study sites: Whakaari (White Island), Rangitoto Island, Mt Tarawera, Mt Ngauruhoe, Mt Ruapehu, and Mt Taranaki in New Zealand and Mauna Loa in Hawaii. The main focus of this account is forest development following significant eruptions
Circular output from a high power Nd:YLF slab laser
No full textNeodymium-doped Yttrium Lithium Fluoride (YLF) lasers have traditionally been power-limited by the relatively low tensile strength of the crystal. When power-scaling solid-state lasers, the choice of the gain media geometry, the doping level, and the pumping scheme is dictated by minimizing the impact of thermally induced stress. To date the slab architecture has been the most successful for scaling the average-power of Nd:YLF lasers due to its favorable thermal management. However, for efficient high-radiance laser action it is also necessary to have a good overlap between the cavity mode and the planar gain volume. We present the performance characteristics for an end-pumped slab-laser utilizing a stable low-loss resonator configuration that transforms a circular cavity mode at the output coupler into a very high aspect ratio elliptical beam in the slab gain element to match the pumped volume. The optical arrangement for transforming the beam shape is also suitable for a double-pass slab amplifier configuration. A polarized CW output power of 50W, on the weaker Nd:YLF 1053nm transition was obtained with a single slab gain element and 110W of incident pump power from three spatially multiplexed diode bars. Laser threshold was around 7W and the slope efficiency, with respect to incident power, 46%
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