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Adrian Carter - One of the best experts on this subject based on the ideXlab platform.
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a review of recent progress in Holmium doped silica fibre sources
Optical Fiber Technology, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:In this paper we present a review of Holmium-doped silica fibre based sources. We discuss recent demonstrations of an efficient cladding-pumped fibre geometry and the impact it has made on the power scaling of these sources. We discuss the wavelength region that is addressable by Holmium-doped silica based devices and highlight the advantage over thulium-doped fibres in terms of atmospheric transmission. Finally we review the development and current status of the pulsed and CW operation of Holmium fibre sources and discuss the future development potential of sources in the ns-fs pulse-width range.
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High power resonantly pumped Holmium-doped fibre sources
Optical Components and Materials XI, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres provide a power scalable gain-medium capable of operation at wavelengths beyond 2.05 μm. We discuss and review our approach to the power scaling of pulsed and CW laser sources at 2.1 μm using Holmium-doped fibres. This paper outlines experiments which demonstrate the wavelength region accessible using Holmium-doped silica fibres, as well as a linearly polarised pulsed master-oscillator power amplifier and high average power CW laser and amplifier systems. These devices demonstrate the applicability of Holmium fibre lasers to a range of scientific, medical, industrial and defence applications.
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Recent progress in resonantly pumped Holmium fibre lasers
Advanced Solid State Lasers, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres enable the operation of silica fibre sources beyond 2.1 µm. We will discuss their applications and present recent results of resonantly core and cladding-pumped Holmium fibre devices.
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a cladding pumped tunable Holmium doped fiber laser
Optics Express, 2013Co-Authors: Nikita Simakov, Alexander Hemming, Andrew W Clarkson, John Haub, Adrian CarterAbstract:We present a tunable, high power cladding-pumped Holmium doped fiber laser. The laser generated >15 W CW average power across a wavelength range of 2.043 – 2.171 μm, with a maximum output power of 29.7 W at 2.120 μm. The laser also produced 18.2 W when operating at 2.171 µm. To the best of our knowledge this is the highest power operation of a Holmium doped laser at a wavelength >2.15 µm. We discuss the significance of background losses and fiber design for achieving efficient operation in Holmium doped fibers.
K N Clausen - One of the best experts on this subject based on the ideXlab platform.
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magnetic structure of Holmium yttrium superlattices
Physical Review B, 1993Co-Authors: D A Jehan, D F Mcmorrow, R A Cowley, R C C Ward, M R Wells, N Hagmann, K N ClausenAbstract:We present the results of a study of the chemical and magnetic structures of a series of Holmium-yttrium superlattices and a 5000 \AA{} film of Holmium, all grown by molecular-beam epitaxy. By combining the results of high-resolution x-ray diffraction with detailed modeling, we show that the superlattices have high crystallographic integrity: the structural coherence length parallel to the growth direction is typically \ensuremath{\approxeq}2000 \AA{}, while the interfaces between the two elements are well defined and extend over approximately four lattice planes. The magnetic structures were determined using neutron-scattering techniques. The moments on the ${\mathrm{Ho}}^{3+}$ ions in the superlattices form a basal-plane helix. From an analysis of the superlattice structure factors of the primary magnetic satellites, we are able to determine separately the contributions made by the Holmium and yttrium to the total helical turn angle per bilayer. It is found that the effective turn angle per atomic plane in the yttrium, which has a value of approximately 50\ifmmode^\circ\else\textdegree\fi{}, is independent of both temperature and the number of yttrium or Holmium planes. The turn angle in the Holmium blocks changes with temperature, and always has a value that is greater than in bulk Holmium. The variation in the turn angle with temperature depends on the length of the Holmium block, but is largely independent of the thickness of the yttrium block. At low temperatures, the (1/6)${\mathbf{c}}^{\mathrm{*}}$ phase found in bulk Holmium is suppressed. The observation of high-order magnetic satellites indicates that the moments instead form long-period, commensurate spin-slip structures. The results are discussed in terms of the strain present in these samples.
Nikita Simakov - One of the best experts on this subject based on the ideXlab platform.
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a review of recent progress in Holmium doped silica fibre sources
Optical Fiber Technology, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:In this paper we present a review of Holmium-doped silica fibre based sources. We discuss recent demonstrations of an efficient cladding-pumped fibre geometry and the impact it has made on the power scaling of these sources. We discuss the wavelength region that is addressable by Holmium-doped silica based devices and highlight the advantage over thulium-doped fibres in terms of atmospheric transmission. Finally we review the development and current status of the pulsed and CW operation of Holmium fibre sources and discuss the future development potential of sources in the ns-fs pulse-width range.
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High power resonantly pumped Holmium-doped fibre sources
Optical Components and Materials XI, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres provide a power scalable gain-medium capable of operation at wavelengths beyond 2.05 μm. We discuss and review our approach to the power scaling of pulsed and CW laser sources at 2.1 μm using Holmium-doped fibres. This paper outlines experiments which demonstrate the wavelength region accessible using Holmium-doped silica fibres, as well as a linearly polarised pulsed master-oscillator power amplifier and high average power CW laser and amplifier systems. These devices demonstrate the applicability of Holmium fibre lasers to a range of scientific, medical, industrial and defence applications.
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Recent progress in resonantly pumped Holmium fibre lasers
Advanced Solid State Lasers, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres enable the operation of silica fibre sources beyond 2.1 µm. We will discuss their applications and present recent results of resonantly core and cladding-pumped Holmium fibre devices.
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a cladding pumped tunable Holmium doped fiber laser
Optics Express, 2013Co-Authors: Nikita Simakov, Alexander Hemming, Andrew W Clarkson, John Haub, Adrian CarterAbstract:We present a tunable, high power cladding-pumped Holmium doped fiber laser. The laser generated >15 W CW average power across a wavelength range of 2.043 – 2.171 μm, with a maximum output power of 29.7 W at 2.120 μm. The laser also produced 18.2 W when operating at 2.171 µm. To the best of our knowledge this is the highest power operation of a Holmium doped laser at a wavelength >2.15 µm. We discuss the significance of background losses and fiber design for achieving efficient operation in Holmium doped fibers.
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Tuneable operation of core and cladding pumped Holmium fibre lasers
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE IQEC, 2013Co-Authors: Nikita Simakov, Alexander Hemming, W.a. Clarkson, A. Carter, John HaubAbstract:Holmium fibre lasers are required for remote sensing, LIDAR and some medical applications. In comparison to thulium fibre lasers, the Holmium emission provides efficient access to the 2070 nm-2150 nm wavelength range [1, 2]. We present the first report of the tuneable range of a resonantly, cladding pumped Holmium fibre laser. This is compared to the tuning range of a core pumped Holmium doped fibre.
Glenn M. Preminger - One of the best experts on this subject based on the ideXlab platform.
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Holmium laser for stone management
World journal of urology, 2007Co-Authors: Sean A. Pierre, Glenn M. PremingerAbstract:The efficiency and safety profile of the Holmium laser has made this tool a versatile multi-purpose instrument for use in the endoscopic treatment of a wide variety of urologic disorders, in particular urinary calculi. Herein we review Holmium laser physics, current endourologic laser lithotripsy applications, and the performance of new low power Holmium laser devices.
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Endoscopic management of urologic disease with the Holmium laser.
Current opinion in urology, 2000Co-Authors: Fernando C. Delvecchio, Glenn M. PremingerAbstract:The efficiency and safety profile of the Holmium laser have made this tool a versatile multipurpose instrument for use in the endoscopic treatment of a wide variety of urologic disorders. Herein are reviewed Holmium laser physics and current endourologic applications, as well as the performance of new low-power Holmium lasers.
Alexander Hemming - One of the best experts on this subject based on the ideXlab platform.
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a review of recent progress in Holmium doped silica fibre sources
Optical Fiber Technology, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:In this paper we present a review of Holmium-doped silica fibre based sources. We discuss recent demonstrations of an efficient cladding-pumped fibre geometry and the impact it has made on the power scaling of these sources. We discuss the wavelength region that is addressable by Holmium-doped silica based devices and highlight the advantage over thulium-doped fibres in terms of atmospheric transmission. Finally we review the development and current status of the pulsed and CW operation of Holmium fibre sources and discuss the future development potential of sources in the ns-fs pulse-width range.
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High power resonantly pumped Holmium-doped fibre sources
Optical Components and Materials XI, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres provide a power scalable gain-medium capable of operation at wavelengths beyond 2.05 μm. We discuss and review our approach to the power scaling of pulsed and CW laser sources at 2.1 μm using Holmium-doped fibres. This paper outlines experiments which demonstrate the wavelength region accessible using Holmium-doped silica fibres, as well as a linearly polarised pulsed master-oscillator power amplifier and high average power CW laser and amplifier systems. These devices demonstrate the applicability of Holmium fibre lasers to a range of scientific, medical, industrial and defence applications.
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Recent progress in resonantly pumped Holmium fibre lasers
Advanced Solid State Lasers, 2014Co-Authors: Alexander Hemming, Nikita Simakov, John Haub, Adrian CarterAbstract:Holmium-doped fibres enable the operation of silica fibre sources beyond 2.1 µm. We will discuss their applications and present recent results of resonantly core and cladding-pumped Holmium fibre devices.
-
a cladding pumped tunable Holmium doped fiber laser
Optics Express, 2013Co-Authors: Nikita Simakov, Alexander Hemming, Andrew W Clarkson, John Haub, Adrian CarterAbstract:We present a tunable, high power cladding-pumped Holmium doped fiber laser. The laser generated >15 W CW average power across a wavelength range of 2.043 – 2.171 μm, with a maximum output power of 29.7 W at 2.120 μm. The laser also produced 18.2 W when operating at 2.171 µm. To the best of our knowledge this is the highest power operation of a Holmium doped laser at a wavelength >2.15 µm. We discuss the significance of background losses and fiber design for achieving efficient operation in Holmium doped fibers.
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Tuneable operation of core and cladding pumped Holmium fibre lasers
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE IQEC, 2013Co-Authors: Nikita Simakov, Alexander Hemming, W.a. Clarkson, A. Carter, John HaubAbstract:Holmium fibre lasers are required for remote sensing, LIDAR and some medical applications. In comparison to thulium fibre lasers, the Holmium emission provides efficient access to the 2070 nm-2150 nm wavelength range [1, 2]. We present the first report of the tuneable range of a resonantly, cladding pumped Holmium fibre laser. This is compared to the tuning range of a core pumped Holmium doped fibre.