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Showing 1 to 20 of 225 for “"Sapphire"”.
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Sapphire optical fiber sensors
… with standard optical fiber sensors. Sapphire fiber sensors offer another option for fiber optic sensing. Sapphire fibers are limited by the material properties of sapphire, which include high melting point, extreme hardness and imperviousness to chemical reactions and radiation. These …
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Sapphire fiber in optical sensors
The physical and optical properties of sapphire fiber has been investigated in an effort to create a high temperature optical fiber sensor. Sapphire fiber demonstrates high optical attenuation. This attenuation is very sensitive to injection conditions, and roughly proportional to the cube of the …
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Single Crystal Sapphire Photonic Crystal Fibers
A single crystal sapphire optical fiber has been developed with an optical cladding that is used to reduce the number of modes that propagate in the fiber. This fiber is the first single crystal sapphire photonic crystal fiber ever produced. Fabrication of the optical cladding reduces the number of …
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Sapphire optical fibers: splicing and sensing applications
… 700°C and large working stresses are involved. Sapphire fiber-based sensors present an attractive alternative for use in such environments. The material properties of sapphire like high melting point, extreme hardness and relative imperviousness to chemical reactions, coupled with the advantages …
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Directly diode-laser-pumped titanium-doped sapphire lasers
Titanium-doped sapphire is one of the most versatile laser gain materials. Tunable between 0.7 m and 1.1 m and capable of generating femtosecond pulses, the Ti:sapphire laser has become an important tool for many applications. Its ubiquitous use across many scientific disciplines is increasingly …
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Optimization of sub-10 femtosecond titanium sapphire lasers
Kerr-lens mode locked Ti:sapphire lasers are the backbone of most ultrafast and attosecond pulse generation systems. As such when building such systems the experimentalist desires an easy to use and robust system to produce femtosecond pulses for use in experiments. Towards this end I will discuss …
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Sapphire Fiber-based Distributed High-temperature Sensing System
… by exploring the feasibility of DTS in optical sapphire waveguides. An all sapphire fiber-based Raman DTS system was demonstrated in a 3-meters long sapphire fiber up to a temperature of 1400°C with a spatial resolution of 16.4cm and a standard deviation of a few degrees Celsius. In this …
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Low Modal Volume Single Crystal Sapphire Optical Fiber
… reducing the diameter of single-crystal sapphire optical fiber (SCSF) below the limits of standard production methods, including the first production of subwavelength-diameter optical fiber (SDF) composed of single-crystal sapphire. The first known demonstration of an air-clad single …
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Sapphire Fiber Optic Sensor for High Temperature Measurement
… developing new technologies for ultra-low-cost sapphire fiber-optic high-temperature sensors. The research is divided into three major parts, the souceless sensor, the simple Fabry-Perot (F-P) interrogator, and the sensor system. Chapter 1 briefly reviews the background of thermal radiation, …
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Gallium and titanium diffused optical waveguide devices in sapphire
… new methods to realise an integrated Ti:Sapphire laser using thermal ionic diffusion. Passive and active waveguides were fabricated by thermal diffusion of gallium and titanium ions in sapphire.<br/><br/>Theoretical simulations were established which describe the potential of planar …
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Mode Volume Reduction in Single Crystal Sapphire Optical Fibers
… geometry factors selection for single crystal sapphire optical fiber (SCSF) to improve the optical property in sensing applications. Single crystal sapphire fibers were fabricated with a Laser Heated Pedestal Growth (LHPG) system, which was constructed in-house at Virginia Tech. The cost …
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Sapphire Based Fiber-Optic Sensing for Extreme High Temperatures
… gasifier or an airplane engine. Single crystal sapphire has been studied in the last two decades as a candidate for harsh environment sensing task, due to its excellent mechanical and optical properties under extreme high temperature (over 1000°C). In this research, a sapphire wafer based …
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Sapphire Fiber Based Sensing Technologies for High Temperature Applications
Sapphire fiber has been studied intensively for harsh environment sensing in the past two decades due to its supreme mechanical, physical and optical properties. It is by far the most reported and likely the best optical fiber based sensing technology for sensing applications in temperature beyond …
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Fabry-Perot Sapphire Temperature Sensor for Use in Coal Gasification
Sapphire fiber based temperature sensors are exceptional in their ability to operate at temperatures above 1000C and as high as 1800C. Sapphire fiber technology is emerging and the fiber is available commercially. Sapphire fiber has a high loss, is highly multi-mode and does not have a solid …
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High temperature diffusion bonding of single crystal sapphire to polycrystalline alumina
Includes bibliographical references (pages 76-77).
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Lattice Strain Measurements of Deuteride Phase Formation in Epitaxial Niobium on Sapphire
Evidence of significant dislocation formation has been confirmed with high-resolution electron microscopy (HREM) for the 1200A Nb film. The HREM images were used to estimate a dislocation density of 1012 cm-2 after repeated cycling. A residual out-of-plane compressive strain was observed in the …
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Strictions and New Stripe Phases of Epitaxial Erbium (0001) on Sapphire (1120)
Made available in DSpace on 2015-09-25T20:02:39Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3030427.pdf: 10179606 bytes, checksum: 0e4297083a1aad984468c1708a39a596 (MD5) Previous issue date: 2001
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Strictions and new stripe phases of epitaxial erbium (0001) on sapphire (112̄0)
Erbium thin films provide a valuable model system with which to explore two phenomena that have made the magnetic phase diagram of thin films hard to predict. These are the elastic energy of epitaxial misfit and the magneto static energy of the equilibrium configuration. In both cases, Er is …
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Growth and characterization of gallium arsenide on silicon-on-sapphire and silicon
Made available in DSpace on 2011-05-07T13:17:41Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010855.pdf: 3192198 bytes, checksum: b5aa62a7610c454f8872ee938fbf712c (MD5) Previous issue date: 1989
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Preparation and characterization of metal/sapphire and metal/polyimide thin film laminates
… effect of thermal cycling on metal/insulator (sapphire and polyimide, PI) thin film laminates through studies of microstructure and microchemistry. Systems studied were: Ti/sapphire, Au/Cu/Ti/PI/Si and Cr/Cu/Cr/PI/Si. In the Ti/sapphire system, there was an additional interest to understand the …
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