Spectroscopy of BeAl_2O_4:Cr^3+ with application to high-temperature sensing

Pugh-Thomas, Devin; Walsh, Brian M.; Gupta, Mool C.

doi:10.1364/ao.49.002891

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…The shape of the measured fluorescence spectrum is in good agreement with the measurements done using calibrated spectral systems in the literature [2,38,42,43]. Note, however that, the fluorescence spectra of Alexandrite might show some differences depending on the excitation wavelength as discussed in [41,[43][44][45]. In our study, a 632.8 nm He-Ne laser was chosen for excitation since it lies at the lower wavelength edge of the main emission spectrum, and could be easily distinguished and removed from the Alexandrite emission spectra (spectral peak of the pump source is electronically removed from the emission spectrum measurements shown in this work).…”

Section: Fluorescence Intensity Measurement Resultssupporting

confidence: 87%

“…In this subsection, we will provide the emission spectrum curves for Alexandrite in absolute units. The emission cross section for Alexandrite gain media in E//b axis can be calculated using the modified Füchtbauer-Ladenburg formula [40,41,56]:…”

Section: Emission Cross Section Curves In Absolute Unitsmentioning

confidence: 99%

“…Figure 2 shows a simplified schematic of the emission cross section measurement setup used in this study. A methodology similar to what was employed in [2,38,40,41] was used in the measurements. A linearly polarized 632.8 nm He-Ne laser with around 1 mW of output power excited the laser gain medium.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Demırbas¹,

Sennaroğlu²,

Kärtner³

2019

Opt. Mater. Express

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We present detailed measurements of effective emission cross section spectra of the Alexandrite gain medium in the 25-450°C temperature range and provide analytic formulas that can be used to match the measured spectra. The measurement results have been used to investigate the wavelength and temperature dependence of small signal gain, as well as gain bandwidth relevant for ultrafast pulse generation/amplification. We show that the estimated laser performance based on the measured spectroscopic data provides a good fit to the results in the literature. We further discuss the need for a detailed measurement of excited-state absorption cross section in future studies.

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Section: Fluorescence Intensity Measurement Resultssupporting

confidence: 87%

Section: Emission Cross Section Curves In Absolute Unitsmentioning

confidence: 99%

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Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Demırbas¹,

Sennaroğlu²,

Kärtner³

2019

Opt. Mater. Express

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“…Attaching a GRIN lens of large NA (0.46) to the end of the imaging buddle, it can not only increase the FOV, it can also improve the depth of field (DOF) enlarging the imaging distance. A number of phosphor powder are available for temperature sensing [14] . But different phosphor materials are of different exciting spectrum and fluorescent spectrum, as well as different sensitive temperature range.…”

Section: Considerations Of System Designmentioning

confidence: 99%

Multifunction medical endoscope system with optical fiber temperature sensor

Zhou²,

Luo

et al. 2014

SPIE Proceedings

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Thermal therapy (or hyperthermia) is one of the effective operations for tumor treating and curing. As tumor tissues are more susceptible to heat than normal tissues, in thermal therapy operations, temperature on operation area is a crucial parameter for optimal treating. When the temperature is too low, the tumor tissues cannot be killed; otherwise, the temperature is too high, the operation may damage normal tissues around the tumor. During thermal therapy operation, the heating power is normally supplied by high-frequency EM field, so traditional temperature sensors, such as thermal couples, thermistors, cannot work stably due to EM interference. We present a multi-function endoscope optical fiber temperature sensor system. With this sensor setup based on principle of fluorescence life time, the temperature on operation point is detected in real time. Furthermore, a build-in endoscope centers in the fiber sensor, thus the operation area can be viewed or imaged directly during the operation. This design can navigate the operation, particularly for in vivo operations. The temperature range of the sensor system is 30℃-150℃, the accuracy can achieve to 0.2℃. The imaging fiber buddle is constituted of more than 50k fibers. As the sensor probe is very thin (around 4 mm in diameter), it can also be assembled inside the radiofrequency operation knife. With the presented sensor system in clinic operation physicians can check the temperature in the operation point and view the operation area at the same time.

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“…Alexandrite, an example of an inorganic phosphor, is found to be sensitive between 15–45ºC where its phosphorescence decay time decreases from 300 to 220 μs. [9] However, alexandrite crystals in powder form lose much of their luminescence, thus, cannot be incorporated in sensor films. Lanthanide phosphors such as La 2 O 2 S:Eu are also responsive to temperature over a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Dual optical sensor for oxygen and temperature based on the combination of time domain and frequency domain techniques

Lam

Rao

Loureiro

et al. 2011

Talanta

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In measuring specific conditions in the real world, there are many situations where both the oxygen concentration and the temperature have to be determined simultaneously. Here we describe a dual optical sensor for oxygen and temperature that can be adapted for different applications. The measurement principle of this sensor is based on the luminescence decay times of the oxygen-sensitive ruthenium complex tris-4,7-diphenyl-1,10-phenanthroline ruthenium(III) [Rudpp] and the temperature-sensitive europium complex tris(dibenzoylmethane) mono(5-amino-1,10-phenanthroline)europium(III) [Eudatp]. The excitation and emission spectra of the two luminophores overlap significantly and cannot be discriminated in the conventional way using band pass filters or other optical components. However, by applying both the frequency and time domain techniques, we can separate the signals from the individual decay time of the complexes. The europium complex is entrapped in a poly-(methyl methacrylate) (PMMA) layer and the ruthenium complex is physically adsorbed on silica gel and incorporated in a silicone layer. The two layers are attached to each other by a double sided silicone based tape. The europium sensing film was found to be temperature-sensitive between 10 and 70ºC and the ruthenium oxygen-sensitive layer can reliably measure between 0 and 21% oxygen.

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Spectroscopy of BeAl_2O_4:Cr^3+ with application to high-temperature sensing

Cited by 20 publications

References 17 publications

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Multifunction medical endoscope system with optical fiber temperature sensor

Dual optical sensor for oxygen and temperature based on the combination of time domain and frequency domain techniques

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