Single-crystal sapphire-based optical high-temperature sensor for harsh environments

Zhang, Yibing; Pickrell, Gary; Qi, Bing; Safaai‐Jazi, A.; Wang, Anbo

doi:10.1117/1.1629123

Cited by 39 publications

(19 citation statements)

References 8 publications

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“…23 Based on these refractive index changes induced in the surroundings of focal volume and by translation of the sample during irradiation, channel buried waveguides have been fabricated with a great relevance as potential integrated laser sources and high temperature optical sensors. [24][25][26] Nevertheless, and despite its interest from both fundamental and applied point of views, the time and thermal stability of the microstructural changes induced in the sapphire network ͑i.e., stability of the fabricated waveguides͒ after ultrafast laser inscription are still unexplored. This information is of relevance since it provides fundamental information about the physics beyond the ultrafast driven microstructural modifications and establishes the working limits of the fabricated photonic devices.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of microstructural and optical modifications induced in sapphire by ultrafast laser filamentation

Benayas

Jaque

McMillen

et al. 2010

Journal of Applied Physics

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We report on the thermal stability of both structural and optical micromodifications created by ultrafast laser written filaments in sapphire crystals. By using the Cr 3+ traces as optical probes, we have concluded that the filaments are constituted by both reversible and nonreversible defects with very different spatial locations. The strain field measured from the analysis of R lines has been found to be erased at the same time when the reversible centers are recombined ͑ϳ1100°C͒. This fact seems to indicate that these defects act as pinning centers for the induced stress. Furthermore, we have found that the waveguide generated in the proximity of the filament disappear for annealing temperatures above 1100°C. This clearly supports the assumption that waveguiding is produced by the strain stress induced refractive index increment based on the dominant electronic polarizability enhancement.

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Section: Introductionmentioning

confidence: 99%

Thermal stability of microstructural and optical modifications induced in sapphire by ultrafast laser filamentation

Benayas

Jaque

McMillen

et al. 2010

Journal of Applied Physics

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“…The working principle of the sensing system has been reported in reference [8]. It will be briefly described here, and the improved design will be detailed.…”

Section: Sensor System Designmentioning

confidence: 99%

Single-crystal Sapphire Based Optical Polarimetric Sensor for High Temperature Measurement

Zhang

Pickrell

et al. 2006

Sensors

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Optical sensors have been investigated and widely deployed in industrial and scientific measurement and control processes, mainly due to their accuracy, high sensitivity and immunity to electromagnetic interference and other unique characteristics. They are especially suited for harsh environments applications, where no commercial electrical sensors are available for long-term stable operations. This paper reports a novel contact optical high temperature sensor targeting at harsh environments. Utilizing birefringent single crystal sapphire as the sensing element and white light interferometric signal processing techniques, an optical birefringence based temperature sensor was developed. With a simple mechanically structured sensing probe, and an optical spectrum-coded interferometric signal processor, it has been tested to measure temperature up to 1600 °C with high accuracy, high resolution, and long-term measurement stability.

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“…The high temperature stability and corrosion resistance of single crystal sapphire optical fiber has made it the material of choice for harsh environment sensing applications and high temperature environments (> 1000°C) [1,2]. Unfortunately, the inherent properties that make sapphire an attractive option for these applicationsalso make it very difficult to process.…”

Section: Introductionmentioning

confidence: 99%

Submicron diameter single crystal sapphire optical fiber

et al. 2015

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Submicron diameter single crystal sapphire optical fiber, Materials Letters, http://dx. AbstractIn this work, a submicron-diameter single crystal sapphire optical fiber was demonstrated via wet acid etching at elevated temperatures. Etch rates on the order 2.3 μm/hr were achievable with a 3:1 molar ratio sulfuric-phosphoric acid solution maintained at a temperature of 343°C. A sapphire fiber with an approximate diameter of 800 nm was successfully fabricated from a commercially available fiber with an original diameter of 50 μm.The simple and controllable etching technique provides a feasible approach to the fabrication of unique waveguide structures via traditional silica masking techniques. The 2 ability to tailor the geometry of sapphire optical fibers is the first step in achieving optical and sensing performance on par with its fused silica counterpart.

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Single-crystal sapphire-based optical high-temperature sensor for harsh environments

Cited by 39 publications

References 8 publications

Thermal stability of microstructural and optical modifications induced in sapphire by ultrafast laser filamentation

Thermal stability of microstructural and optical modifications induced in sapphire by ultrafast laser filamentation

Single-crystal Sapphire Based Optical Polarimetric Sensor for High Temperature Measurement

Submicron diameter single crystal sapphire optical fiber

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