Quantum Theory of Laser Radiation. II. Statistical Aspects of Laser Light

1966 ◽  
Vol 149 (1) ◽  
pp. 322-329 ◽  
Author(s):  
J. A. Fleck
Keyword(s):  
Quantum Theory ◽  
Laser Radiation ◽  
Laser Light

Laser and Radiowave Technologies in Dermatovenerology and Cosmetology

2021 ◽  
Vol 65 (5) ◽  
pp. 68-76
Author(s):  
E Lipova ◽  
M Rakhmatulina ◽  
I Glazko ◽  
A Chekmarev
Keyword(s):  
Laser Radiation ◽  
Laser Light ◽  
Current Data ◽  
Fractional Laser ◽  
Skin Rejuvenation ◽  
Skin Exposure ◽  
Low Intensity ◽  
High Intensity Laser ◽  
Detailed Characteristic ◽  
Intensity Laser

The article presents current data on the use of laser and radio-wave techniques in dermatology and cosmetology. Types of lasers, reactions of interaction of laser light with skin are characterized, the detailed characteristic of low-intensity and high-intensity laser radiation and opportunities of their application in dermatology and cosmetology is given. Ablative and non-ablative methods of skin exposure, the principle of fractional laser photothermolysis are described. The method of radiowave influence on tissues and its modes is presented. The principles of radiowave surgery and the possibility of using radiowave techniques in the treatment of skin tumors and aesthetic cosmetology are discussed. The data on the use of Plasma RFL regime for plasma skin rejuvenation are described.

scholarly journals Quantum theory of the dispersion of the laser light

2018 ◽  
Vol 7 (6) ◽  
pp. 1-9
Author(s):  
Miroslav Pardy ◽  
Keyword(s):  
Quantum Theory ◽  
Laser Light

scholarly journals Effect of laser on the remnant liver after the first 24 hours following 70% hepatectomy in rats

2011 ◽  
Vol 26 (6) ◽  
pp. 470-474 ◽  
Author(s):  
Ailton Jose Barbosa ◽  
Ana Carolina Delazia Albuquerque Santana ◽  
Tiago Castro e Silva ◽  
Cristina Kurachi ◽  
Natalia Inada ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Mitochondrial Function ◽  
Laser Light ◽  
Substantial Reduction ◽  
Respiratory Control ◽  
Control Group ◽  
Remnant Liver ◽  
Concomitant Increase ◽  
Group 4 ◽  
Male Wistar Rats

PURPOSE: To evaluate the mitochondrial function of the remnant liver (RL) in the early phase of liver regeneration in rats after 70% partial hepatectomy (PH). METHODS: Sixty male Wistar rats (200-250g) submitted to 70% PH were divided into five groups according to the time of euthanasia and application or not of laser light: C = Control, time zero; 2 minutes, 4, 6 and 24 hours after PH. The dose of laser radiation was 22.5 J/cm², wavelength of 660 nm (visible/red), in the remnant liver. We studied the respiration activated by ADP (state 3), basal mitochondrial respiration (state 4), respiratory control ratio (RCR) and mitochondrial membrane potential (MMP). RESULTS: The mitochondrial function of RL changed at 4 and 6 hours after PH, with a significant increase in state 3 and a concomitant increase in state 4 and with maintenance of RCR. MMP differed significantly between the groups biostimulated with laser radiation and the control group 4 hours after HP, with a substantial reduction in the non-laser groups. CONCLUSION: The laser light at the dose used in this study did not induce additional damage to the RL and seems to have delayed the hepatocellular metabolic overload of the remnant liver.

scholarly journals Влияние содержания меди на кинетику микроволновой фотопроводимости твердых растворов CIGS

2019 ◽  
Vol 53 (3) ◽  
pp. 323
Author(s):  
Г.Ф. Новиков ◽  
Е.В. Рабенок ◽  
П.С. Оришина ◽  
М.В. Гапанович ◽  
И.Н. Один
Keyword(s):  
Laser Radiation ◽  
Light Intensity ◽  
Solid Solutions ◽  
Skin Effect ◽  
Laser Light ◽  
Chalcopyrite Structure ◽  
Radiation Density ◽  
Light Pulses ◽  
Intensity Range ◽  
Kinetics Of

AbstractThe kinetics of the photoresponse of microwave photoconductivity (9 GHz, TE_101-type cavity) on excitation by laser light pulses with a wavelength of 337 nm and a duration of 8 ns in copper-deficient Cu_1 –_ x (In_0.7Ga_0.3)Se_2 (CIGS) (0 < x ≤ 0.4) solid solutions with the chalcopyrite structure is investigated in a wide light intensity range. With an increase in the laser radiation density to ~5 × 10^14 photon/cm^2 per pulse, the photoresponse acquires, along with the previously revealed skin effect, the effect of the filling of traps created by V _Cu vacancies and Cu^+2 · V _Cu defect associates, the concentration of which increases with a decrease in x in the CIGS formula.

AUTOMATIC LASER LIGHT DETECTION AND FILTERING USING A LIQUID CRYSTAL LYOT FILTER

1993 ◽  
Vol 02 (04) ◽  
pp. 661-676 ◽  
Author(s):  
S. REES ◽  
J. STAROMLYNSKA
Keyword(s):  
Liquid Crystal ◽  
Laser Radiation ◽  
Laboratory Tests ◽  
Laser Light ◽  
Contrast Ratio ◽  
Detection Sensitivity ◽  
Laser Source ◽  
Protection Device ◽  
Cw Laser ◽  
Lyot Filter

A device which acts as both a simple cw laser warner and anti-dazzle protection device has been designed and tested. The design is based on a single stage, double element, tunable liquid crystal Lyot filter. Laboratory tests have shown that the detection sensitivity of the device for monochromatic cw radiation is approximately 43×10−9 W/cm 2 and that the achievable contrast ratio is greater than 100:1 Automatic detection and filtering of a cw laser source has been demonstrated. Results indicate that the algorithm to automatically filter the laser radiation works well and that the extinction obtained is good. Factors which affect the contrast ratio are discussed and improved device design suggested.

THE CHEMISTRY AND BIOLOGY OF GOLD NANOPARTICLE-MEDIATED PHOTOTHERMAL THERAPY: PROMISES AND CHALLENGES

Nano LIFE ◽  
2013 ◽  
Vol 03 (03) ◽  
pp. 1330001 ◽  
Author(s):  
RITA M. CABRAL ◽  
PEDRO V. BAPTISTA
Keyword(s):  
Gold Nanoparticles ◽  
Laser Radiation ◽  
Therapeutic Approach ◽  
Photothermal Therapy ◽  
Thermal Damage ◽  
Laser Light ◽  
Cancer Therapies ◽  
Translation Research ◽  
Localized Heating ◽  
Biological Aspects

Under laser radiation, cells labeled with gold nanoparticles (AuNPs) are believed to suffer thermal damage due to the transfer of the absorbed light from the AuNPs to the cells. This process, which involves complex mechanisms such as the rapid electron–phonon decay in the AuNPs , followed by phonon–phonon relaxation, culminates in the localized heating of both the AuNPs and the cells, setting the rational for the use of these nanostructures, under laser light, in cancer photothermal therapy (PTT). Here, we discuss the chemical and biological aspects of this promising new therapeutic approach, including the advantages over conventional cancer therapies and the challenges that scientists still need to overcome to progress toward translation research.

scholarly journals Analysis of retinal expression of genes involved in the regulation of angiogenesis and endothelial barrier function following exposure of the retina to 577 nm wavelength laser light in continuous mode

2021 ◽  
Vol 24 (2) ◽  
pp. 37-45
Author(s):  
Natalia A. Gavrilova ◽  
Konstantin G. Gurevich ◽  
Olga Yu. Komova ◽  
Alexandra V. Zinoveva
Keyword(s):  
Laser Radiation ◽  
Intravitreal Injection ◽  
Barrier Function ◽  
Laser Light ◽  
Endothelial Barrier ◽  
Therapeutic Effects ◽  
Continuous Mode ◽  
Endothelial Barrier Function ◽  
The Third ◽  
Expression Of Genes

Objective. The aim of the study was to investigate the retinal expression of genes involved in the regulation of angiogenesis and endothelial barrier function after exposure of the retina to 577 nm laser light in a continuous mode in experimental conditions after intravitreal injection of VEGF165 (Vascular endothelial growth factor). Materials and methods. The study was performed on 4-5 week old male C57BL / 6J mice. 4 groups, 5 mice in each, were formed, one animal eye was experimental and the second remained intact. The animals of the first group received intravitreal injection of phosphate-buffered saline (PBS); animals in the second, third and fourth groups received intravitreal injection of 50 ng/ml of recombinant VEGF165; in the third and fourth groups, one day after the VEGF165 intravitreal administration, laser irradiation with a wavelength of 577 nm was performed on the retina in micropulse and continuous modes, respectively. Tissue samples from animals of the first and second groups were taken 2 days after PBS and VEGF165 administration, and in animals from the third and fourth groups one day after laser exposure to the retina. Results. Retinal expression of genes involved in the regulation of angiogenesis and endothelial barrier function as a result of retinal exposure to 577 nm laser radiation in continuous mode following intravitreal injection of VEGF165 was studied. Genes with significant changes in expression levels were identified (genes that regulate the processes of angiogenesis). Conclusion. Understanding the mechanisms of modulation of retinal gene expression may help to identify the key regulatory factors providing therapeutic effects of laser radiation in continuous and micropulsed modes and provide the basis for future therapeutic tactics for retinal diseases.

PL16 Effect of laser radiation on platelet function is dependent on polarization state of laser light

2010 ◽  
Vol 7 ◽  
pp. S29
Author(s):  
G.E. Brill ◽  
I.A. Budnik ◽  
K.V. Agadzhanova ◽  
S.E. Loginovskaya ◽  
A.B. Pravdin ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Platelet Function ◽  
Laser Light ◽  
Polarization State
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