Theoretical and experimental evaluation of piezo-optic parameters and photoelastic constant in tetragonal PWO

Natali, P. P.; Montalto, Luigi; Davı́, Fabrizio; Mengucci, P.; Ciriaco, Andrea; Paone, Nicola; Rinaldi, D.

doi:10.1364/ao.57.000730

Cited by 15 publications

(17 citation statements)

References 23 publications

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“…In fact, Equation 9is also valid for naturally birefringent crystals, taking into account that the unstressed interference pattern is composed of CL curves. For the analytical expression of the photoelastic constant and the ellipticity, refer to [25][26][27]. By observing orthogonally to the optic axis (or along the obtuse bisector of biaxial crystals), the interferogram appears as a series of hyperbolas (Figure 2a,b).…”

Section: Conoscopic Fringe Patterns and Their Interpretationmentioning

confidence: 99%

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals

et al. 2019

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Nowadays, radiation detectors based on scintillating crystals are used in many different fields of science like medicine, aerospace, high-energy physics, and security. The scintillating crystals are the core elements of these devices; by converting high-energy radiation into visible photons, they produce optical signals that can be detected and analyzed. Structural and surface conditions, defects, and residual stress states play a crucial role in their operating performance in terms of light production, transport, and extraction. Industrial production of such crystalline materials is a complex process that requires sensing, in-line and off-line, for material characterization and process control to properly tune the production parameters. Indeed, the scintillators’ quality must be accurately assessed during their manufacture in order to prevent malfunction and failures at each level of the chain, optimizing the production and utilization costs. This paper presents an overview of the techniques used, at various stages, across the crystal production process, to assess the quality and structural condition of anisotropic scintillating crystals. Different inspection techniques (XRD, SEM, EDX, and TEM) and the non-invasive photoelasticity-based methods for residual stress detection, such as laser conoscopy and sphenoscopy, are presented. The use of XRD, SEM, EDX, and TEM analytical methods offers detailed structural and morphological information. Conoscopy and sphenoscopy offer the advantages of fast and non-invasive measurement suitable for the inspection of the whole crystal quality. These techniques, based on different measurement methods and models, provide different information that can be cross-correlated to obtain a complete characterization of the scintillating crystals. Inspection methods will be analyzed and compared to the present state of the art.

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Section: Conoscopic Fringe Patterns and Their Interpretationmentioning

confidence: 99%

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals

et al. 2019

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“…В последнее время существенно увеличилось количество работ, посвященных изучению фотоупругости (пьезои упругооптический эффекты) в кристаллах, имеющих разные классы симметрии [1][2][3][4][5][6][7][8][9]. Это обусловлено поиском новых оптических материалов с высокой акустооптической (АО) эффективностью.…”

Section: Introductionunclassified

Фотоупругие Свойства Кристаллов Сульфата Калия

Стадник¹,

Матвиив²,

Щепанский³

et al. 2019

Физика Твердого Тела

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Поступила в Редакцию 25 июня 2019 г. В окончательной редакции 25 июня 2019 г. Принята к публикации 8 июля 2019 г.Изучены спектральные зависимости абсолютных пьезооптических коэффициентов кристаллов сульфата калия и установлена их незначительная дисперсионная зависимость. Используя значения коэффициентов упругой жесткости и абсолютных пьезооптических коэффициентов, заполнена матрица упругооптических коэффициентов pin данных кристаллов. Рассчитан коэффициент акустооптической эффективности M 2 и показано, что за величиной максимальных значений он более чем на порядок выше, чем у кристаллов кварца и бората стронция. Предложено, учитывая коротковолновую границу области прозрачности кристаллов сульфата калия (∼ 170 nm), использовать их для акустооптической модуляции ультрафиолетового излучения.Ключевые слова: сульфат калия, пьезо-и упругооптические коэффициенты, акустооптическая эффективность.

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“…In order to face these challenges, the light performances of scintillator materials need to be improved through theoretical efforts and experimental assessment [8,9]. The condition of scintillators must be accurately evaluated, and it is mandatory to finely tune the production process parameters via feedback from the crystal final state [10][11][12]. Structural conditions and elasto-optical properties of scintillators play a crucial role that must be deeply investigated [13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of a Surface Finishing Method on Light Collection Behaviour of PWO Scintillator Crystals

et al. 2018

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In the field of scintillators, high scintillation and light production performance require high-quality crystals. Although the composition and structure of crystals are fundamental in this direction, their ultimate optical performance is strongly dependent on the surface finishing treatment. This paper compares two surface finishing methods in terms of the final structural condition of the surface and the relative light yield performances. The first polishing method is the conventional “Mechanical Diamond Polishing” (MDP) technique. The second polishing technique is a method applied in the electronics industry which is envisaged for finishing the surface treatment of scintillator crystals. This method, named “Chemical Mechanical Polishing” (CMP), is efficient in terms of the cost and material removal rate and is expected to produce low perturbed surface layers, with a possible improvement of the internal reflectivity and, in turn, the light collection efficiency. The two methods have been applied to a lead tungstate PbWO4 (PWO) single crystal due to the wide diffusion of this material in high energy physics (CERN, PANDA project) and diagnostic medical applications. The light yield (LY) values of both the MDP and CMP treated crystals were measured by using the facilities at CERN while their surface structure was investigated by Scanning Electron Microscopy (SEM) and Grazing Incidence X-ray Diffraction (GID). We present here the corresponding optical results and their relationship with the processing conditions and subsurface structure.

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Theoretical and experimental evaluation of piezo-optic parameters and photoelastic constant in tetragonal PWO

Cited by 15 publications

References 23 publications

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals

Фотоупругие Свойства Кристаллов Сульфата Калия

Influence of a Surface Finishing Method on Light Collection Behaviour of PWO Scintillator Crystals

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