Luminescence and EPR properties of high quality ruby crystals prepared by the optical floating zone method

Liu, Fenhong; Goodman, B. A.; Tan, Xuezhi; Wang, Xiangyu; Chen, Danxin; Deng, Wen

doi:10.1016/j.optmat.2019.03.018

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…4a, the split signal situated at 3510 GHz was easily detected with the corresponding g -value of 2.005, indicating the presence of oxygen vacancy-related defects. 34 In addition, it was clear that the increase in the CeO 2 doping amount in Ce2 led to an obvious enhancement of the oxygen-vacancy signal intensity compared to in Ce1, which was due to more oxygen vacancies generated from the Ce 4+ reduction process. Whereas as the concentration of Ce 3+ exceeded a certain value, the negative Ce 3+ ions interactions reduced the probability of oxygen vacancies to capture the excitation electrons, which tremendously worsened the LPL performance.…”

Section: Resultsmentioning

confidence: 95%

Observation of long persistent luminescence in Ce³⁺-doped glass

Guan

et al. 2022

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 95%

Observation of long persistent luminescence in Ce³⁺-doped glass

Guan

et al. 2022

J. Mater. Chem. C

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“…The ruby has widely been used as jewelry, laser and applied in various industries such as medical industries, jewelry industries and many more. Due to its significant optical properties, such as having high hardness (9 on Mohs scale), strong, have stable chemical and thermal properties, high insulation and optical transparency is an advantage for modern technological applications which is applied in lasers, optoelectronics, temperature sensors and precision machinery devices [3].…”

Section: Introductionmentioning

confidence: 99%

Non-Invasive Grading Technique for Ruby Gemstone Using Charge-Coupled Device (Ccd)

Rahalim

Jamaludin²,

Raisin³

2023

AEJ

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Ruby is one of the most popular and high-value gemstones that always attract the gemologist and jeweler in the diamond market. The wide use of ruby in various industries makes the grading of this gems more complicated due to a lot of synthetic and imitation rubies are made. The current grading techniques are mostly depending on the human visual assessment which prone to errors. This paper proposes a system that helps in grading the clarity characteristic of the ruby in non-invasive manner. The system includes a charge-coupled devices (CCD) and laser that is designed in the most suitable and effective way to conduct inspection on the light intensity of the ruby which will then determine the clarity of the ruby. CCD linear sensor is widely known as the reliable sensor especially when use in the optical system. The CCD linear sensor capture the light intensity from the ruby and convert it into the voltage value. The result shows a value of 1.7918 V obtained from the CCD linear sensor when ruby is placed in the system. This concludes that the CCD system can detect even slightest changes in the light intensity that can pass through the ruby and falls on the CCD linear sensor. The system is proven to be a reliable and effective system with 80% accuracy.

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“…Besides these classical crucible methods, the crucible-free floating zone method also has passed significant instrumental progress triggered by its utilization in the growth of single crystals of high- T c superconductors . A very popular branch of the floating zone method (FZM) is its implementation to mirror optical furnaces with halogen or xenon lamps produced commercially as the so-called traveling solvent zone method (TSZM). − Such an arrangement allows the melting and single crystal growth of materials with a melting point up to 3000 °C based on oxides ,− as well as a very recent series of metallic systems originally often unavailable by the Czochralski method. − …”

Section: Introductionmentioning

confidence: 99%

Nd:YAG Single Crystals Grown by the Floating Zone Method in a Laser Furnace

Zajíc

Klejch

Eliáš

et al. 2023

Crystal Growth & Design

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We report on single crystal growth of laser material Nd:YAG widely used in the applications by the innovative crucible-free floating zone method implemented in an advanced laser optical furnace. We have optimized the parameters for the production of high-quality single crystals of the size typical for laser rods. To reduce the strain and improve machinability, we have developed an afterheater to thermalize the grown part of a single crystal below the hot zone, which is a technique unavailable in common mirror furnaces. The high quality of the single crystals was verified by Laue diffraction, and the internal strain was documented by neutron diffraction. The absorption spectrum corresponds with the parameters of the commercially used material produced by the Czochralski method. The presented methodology for the single crystal growth by the floating zone method with laser heating is applicable for the preparation of other high-quality single crystals of oxide-based materials, particularly in an oxidizing environment unattainable in commonly used crucible methods.

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Luminescence and EPR properties of high quality ruby crystals prepared by the optical floating zone method

Cited by 10 publications

References 26 publications

Observation of long persistent luminescence in Ce³⁺-doped glass

Observation of long persistent luminescence in Ce³⁺-doped glass

Non-Invasive Grading Technique for Ruby Gemstone Using Charge-Coupled Device (Ccd)

Nd:YAG Single Crystals Grown by the Floating Zone Method in a Laser Furnace

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Luminescence and EPR properties of high quality ruby crystals prepared by the optical floating zone method

Cited by 10 publications

References 26 publications

Observation of long persistent luminescence in Ce3+-doped glass

Observation of long persistent luminescence in Ce3+-doped glass

Non-Invasive Grading Technique for Ruby Gemstone Using Charge-Coupled Device (Ccd)

Nd:YAG Single Crystals Grown by the Floating Zone Method in a Laser Furnace

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Observation of long persistent luminescence in Ce³⁺-doped glass

Observation of long persistent luminescence in Ce³⁺-doped glass