YAG : R3+ (R = Ce, Dy, Yb) nanophosphor-based luminescent fibre-optic sensors for temperature measurements in the range 20–500 °C

2022 ◽  
Vol 52 (1) ◽  
pp. 94-99
Author(s):  
S K Evstropiev ◽  
V V Demidov ◽  
D V Bulyga ◽  
R V Sadovnichii ◽  
G A Pchelkin ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Signal Amplitude ◽  
Temperature Sensors ◽  
Yttrium Aluminium Garnet ◽  
Optical Fibres ◽  
Fibre Optic ◽  
Excitation Light ◽  
Yttrium Aluminium ◽  
Increasing Temperature ◽  
Silica Capillary

Abstract We report the development of a group of luminescent fibre-optic temperature sensors that use Ce3+-, Dy3+-, and Yb3+-doped yttrium aluminium garnet (YAG) nanophosphors as thermosensitive materials. The nanophosphors have been prepared in the form of powders with a crystallite size from 19 to 27 nm by a polymer ? salt method and exhibit bright luminescence at 550 (YAG : Ce3+), 400, 480 (YAG : Dy3+), and 1030 nm (YAG : Yb3+). The sensor design includes a silica capillary, partially filled with a nanophosphor, and two large-aperture multimode optical fibres located in the capillary, which deliver excitation light and receive and transmit the photoluminescence signal. The photoluminescence signal amplitude of all the sensors decreases exponentially with increasing temperature, pointing to characteristic thermal quenching of photoluminescence and adequate operation of the devices up to 500 °C. The highest temperature sensitivity among the fibre-optic sensors is offered by the YAG : Ce3+ nanophosphor-based devices.

scholarly journals Minimally invasive (flapless) crown lengthening by erbium:YAG laser in aesthetic zone

F1000Research ◽  
2021 ◽  
Vol 9 ◽  
pp. 1185
Author(s):  
Saverio Capodiferro ◽  
Angela Tempesta ◽  
Luisa Limongelli ◽  
Giuseppe Barile ◽  
Daniela Di Venere ◽  
...  
Keyword(s):  
Surgical Technique ◽  
Bone Remodelling ◽  
Tooth Surface ◽  
Yttrium Aluminium Garnet ◽  
Anterior Maxilla ◽  
Erbium:Yag Laser ◽  
Yttrium Aluminium ◽  
Erbium Doped ◽  
Flap Elevation ◽  
Crown Lengthening

Crown lengthening is a surgical procedure aimed at exposure of a larger tooth surface by gingivectomy alone or with cortical bone remodelling for aesthetic purposes in the anterior zone of the maxilla or for reconstruction of teeth affected by subgingival caries. We report two cases of crown lengthening in the anterior maxilla for aesthetic purposes by gingival and bone re-contouring performed by erbium-doped yttrium aluminium garnet (erbium:YAG) laser. As highlighted in this report, the erbium:YAG laser-assisted crown lengthening is less invasive and also leads to faster clinical outcomes in contrast to the conventional surgical technique by scalpel incision, flap elevation and osteoplastic.

scholarly journals Guidelines for removing permanent makeup

2016 ◽  
Vol 1 (3) ◽  
Author(s):  
C.Bettina Rümmelein
Keyword(s):  
Treatment Guidelines ◽  
Yttrium Aluminium Garnet ◽  
Retrospective Evaluation ◽  
Cosmetic Procedure ◽  
Technical Point ◽  
Eye Protection ◽  
Yttrium Aluminium ◽  
Laser Treatments ◽  
Colour Changes ◽  
Set Up

<p>Permanent makeup (PMU) is a frequently implemented cosmetic procedure performed by beauticians. From a technical point, PMU is considered a facial tattoo. Failed procedures or a change of mind can lead to the desire for removal. The purpose of this retrospective evaluation of patients who came to the clinic with the desire to remove PMU between 2011 and 2015 was to explore the problems, side effects, and results in order to define treatment guidelines for other doctors. We evaluated 87 individual cases in total. In treatable cases, i.e. 52 out of the 87 cases, laser treatments were performed using a nanosecond Q-switched neodymium-doped yttrium aluminium garnet (Nd:YAG) laser. It takes between 1-12 treatments to remove the PMU. In three cases, the colour of the PMU could not be removed by laser and remained after the treatment. In two cases, laser treatment had to be terminated due to colour changes towards the green-blue spectrum. Before PMU removal, laser test shots are urgently recommended as unforeseeable colour changes can cause severe aesthetically unpleasant results. Covered up PMU (skin colour) is particularly susceptible to changes in colour. Heat-induced shrinking of the eye area can cause an ectropium. Surgical solutions also have to be taken into consideration. The use of proper eye protection with intraocular eye shields is mandatory. This article is an attempt to set up some guidelines for the treatment of PMU removal.</p>

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