Quantum Electronics最新文献_第9页

Influence of the measurement configuration on the results of Raman microspectroscopy of human hair 测量结构对头发拉曼光谱结果的影响

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17973

N. N. Brandt, E. Travkina, E. Mikhal'chik, A. Chikishev

引用次数: 0

In vitro study of cataract extraction by bursts of microsecond 1.54-μm laser pulses 1.54 μm微秒激光脉冲体外白内障摘除实验研究

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/QEL17959

A. V. Belikov, S. Smirnov, Yuriy Batov, A. B. Gubin, Yu. B. Pirozhkov, E. Boiko, M. Nemsitsveridze

{"title":"In vitro study of cataract extraction by bursts of microsecond 1.54-μm laser pulses","authors":"A. V. Belikov, S. Smirnov, Yuriy Batov, A. B. Gubin, Yu. B. Pirozhkov, E. Boiko, M. Nemsitsveridze","doi":"10.1070/QEL17959","DOIUrl":"https://doi.org/10.1070/QEL17959","url":null,"abstract":"Laser extraction of a model porcine eye cataract has been performed for the first time in an in vitro experiment using a 1.54-μm Yb, Er : glass laser generating bursts of microsecond pulses. We used effective pulse repetition rates from 36 to 75 Hz and average laser output powers from 3.9 to 5.25 W. The results demonstrate for the first time that, at an effective pulse repetition rate of 45 Hz, burst repetition rate of 15 Hz, three microsecond pulses per burst, and a burst energy from 260 to 265 mJ, the laser step duration in cataract extraction is 130 ± 10 s, which is comparable to the ultrasonic phacoemulsification and laser extraction time in the case of a Nd : YAG laser emitting at 1.44 μm. Acoustometry and high speed video recording of hydroacoustic processes accompanying interaction of water with 1.54-μm radiation from the Yb, Er : glass laser generating bursts of microsecond pulses have made it possible for the first time to detect overlap of hydroacoustic processes at the pulse spacing in bursts reduced to under 700 μs. In the case of overlap of hydroacoustic processes, despite the increase in average power and effective pulse repetition rate, acoustic wave generation is ineffective because pulses propagate through bubbles formed in the water. Laser cataract extraction is shown to be most effective at a lower average power, lower effective pulse repetition rate, and burst pulse spacing of 850 ± 10 μs.","PeriodicalId":20775,"journal":{"name":"Quantum Electronics","volume":"88 1","pages":"69 - 77"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90057260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Estimation of a minimum laser power with wavelengths of 1.47, 1.56, and 1.68 μm for efficient obliteration of varicose veins 估计波长为1.47、1.56和1.68 μm的最小激光功率，有效地消除静脉曲张

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17968

N. Ignat'eva, O. Zakharkina, A. Sviridov, K. V. Mazaishvili, A. Shekhter

{"title":"Estimation of a minimum laser power with wavelengths of 1.47, 1.56, and 1.68 μm for efficient obliteration of varicose veins","authors":"N. Ignat'eva, O. Zakharkina, A. Sviridov, K. V. Mazaishvili, A. Shekhter","doi":"10.1070/qel17968","DOIUrl":"https://doi.org/10.1070/qel17968","url":null,"abstract":"Experiments modelling endovenous laser obliteration (EVLO) are performed. As a result, laser radiation powers P c at which collagen denaturation, tissue necrosis, and vasa vasorum destruction occur throughout the entire venous-wall thickness and, at the same time, the surrounding tissues are not subjected to unnecessary heating, are found. The main criterion for determining P c is the achievement of 100 % denaturation of venous-wall proteins, confirmed by morphological and calorimetric analysis. The P c values for laser wavelengths of 1.47, 1.56, and 1.68 μm are found to be 6.0 ± 0.2, 5.0 ± 0.2, and 6.0 ± 0.2 W, respectively. It is established for all wavelengths in use that the temperature of the external venous-wall surface reaches 91 ± 2 °C at the corresponding power P c. We relate the dependence of P c on the radiation wavelength to the formation of a coagulum on the optical fibre tip moving through a blood-filled vessel. The achievement of temperature necessary for coagulum formation is determined by the simultaneously occurring processes of energy absorption and its dissipation in the form of heat. These processes become more intense with an increase in the absorption coefficient of the medium. A mechanism is proposed to explain the relationship between the P c value and laser wavelength, based on the influence of the absorption coefficient of medium (blood) on the temperature near the fibre tip.","PeriodicalId":20775,"journal":{"name":"Quantum Electronics","volume":"22 1","pages":"78 - 82"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90059025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Terahertz microscope with oblique subwavelength illumination: design principle 倾斜亚波长照明的太赫兹显微镜:设计原理

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17958

O. Minin, I. Minin

引用次数: 4

Testing the adequacy of a simple theoretical model of dehydration optical clearing of collagen bundles: OCT measurements 检验胶原束脱水光学清除的简单理论模型的充分性:OCT测量

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/QEL17965

O. A. Zyuryukina, M. E. Shvachkina, V. Kochubey, Y. Sinichkin, D. Yakovlev

{"title":"Testing the adequacy of a simple theoretical model of dehydration optical clearing of collagen bundles: OCT measurements","authors":"O. A. Zyuryukina, M. E. Shvachkina, V. Kochubey, Y. Sinichkin, D. Yakovlev","doi":"10.1070/QEL17965","DOIUrl":"https://doi.org/10.1070/QEL17965","url":null,"abstract":"Using optical coherence tomography, the scattering coefficients of collagen bundles are estimated at different levels of tissue hydration. We test the validity of a simple theoretical model of dehydration changes in the optical characteristics of a collagen bundle, which is considered as a system of parallel cylinders that model the collagen fibrils forming the bundle. The characteristics of scattering by individual scatterers are calculated using the Mie theory. To take into account the cooperative effects caused by the close packing of the scatterers, use is made of the standard packing function for a system of identical cylinders. The theoretical model also relies on a certain empirical law of changes in the hydration level of fibrils with a change in the water content in the tissue, which predetermines changes in the diameter and refractive index of fibrils during dehydration and rehydration of the tissue. It is shown that the theoretical estimates obtained using this model are in good agreement with the experimental data, which makes it possible to consider this model as reliable.","PeriodicalId":20775,"journal":{"name":"Quantum Electronics","volume":"21 1","pages":"48 - 55"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73872991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17964

H. Zhang, M. Singh, Fernando Zvietcovich, K. Larin, S. Aglyamov

引用次数: 3

Study of adsorption of the SARS-CoV-2 virus spike protein by vibrational spectroscopy using terahertz metamaterials 太赫兹超材料振动光谱吸附SARS-CoV-2病毒刺突蛋白的研究

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17960

M. Konnikova, O. Cherkasova, T.A. Geints, E. Dizer, A. A. Man'kova, I. S. Vasilievskii, A. Butylin, Y. Kistenev, V. Tuchin, A. Shkurinov

引用次数: 0

Novel approaches in 3D live cell microscopy 三维活细胞显微镜的新方法

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17961

V. Richter, M. Rank, A. Heinrich, H. Schneckenburger

引用次数: 1

Inactivation of coronaviruses under irradiation by UVA-range light-emitting diodes uva范围发光二极管照射下冠状病毒的灭活

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/qel17969

I. Zavestovskaya, V. Gushchin, L. I. Russu, E. Cheshev, A. Koromyslov, I. Tupitsyn, A. A. Fronya, M. S. Grigor'eva

引用次数: 0

Theranostics of skin neoplasms based on luminescence diagnostics in combination with photodynamic therapy in the absorption band of porphyrin 基于荧光诊断结合卟啉吸收带光动力治疗的皮肤肿瘤治疗

IF 0.9 4区工程技术

Quantum Electronics Pub Date : 2022-01-01 DOI: 10.1070/QEL17966

I. Shilov, A. S. Gorshkova, A. Ivanov, V. Rumyantseva, G. Danielyan, V. Kashin

{"title":"Theranostics of skin neoplasms based on luminescence diagnostics in combination with photodynamic therapy in the absorption band of porphyrin","authors":"I. Shilov, A. S. Gorshkova, A. Ivanov, V. Rumyantseva, G. Danielyan, V. Kashin","doi":"10.1070/QEL17966","DOIUrl":"https://doi.org/10.1070/QEL17966","url":null,"abstract":"We report the results of developing a technique for theranostics of skin neoplasms based on luminescence diagnostics in combination with photodynamic therapy (PDT) in the absorption band of porphyrin. It is shown that the therapeutic effect is achieved exclusively due to PDT, without the participation of the hyperthermia process, which occurs at temperatures above 42°C. The Fluroscan gel [based on the dipotassium salt of the ytterbium complex of 2,4-di-(α-methoxyethyl)deuteroporphyrin IX (Yb-DMDP)] is used as a preparation for theranostics. The main photophysical properties and possible mechanisms of accumulation of nanosized low-toxic photosensitisers based on this compound are studied. It is shown that the Yb-DMDP compound in a DMSO solution (30 % aqueous DMSO) enhances photophysical characteristics (luminescence lifetime 5 – 10 μs, luminescence quantum yield up to 1 %, extinction coefficient ∼1.96 × 105 M−1 cm−1 at a wavelength of 398 nm). Experimental animals are used to test the proposed technique for theranostics of tumours using the Fluroscan gel and a fibre-optic laser fluorimeter.","PeriodicalId":20775,"journal":{"name":"Quantum Electronics","volume":"72 1","pages":"56 - 62"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90242783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0