scholarly journals Импульсный индукционный CO-=SUB=-2-=/SUB=--лазер с энергией излучения 1 J и высоким КПД с ВЧ возбуждением

2022 ◽  
Vol 130 (3) ◽  
pp. 400
Author(s):  
А.М. Ражев ◽  
Е.С. Каргапольцев ◽  
И.А. Трунов
Keyword(s):  
Laser Radiation ◽  
Co2 Laser ◽  
Radiation Energy ◽  
Maximum Efficiency ◽  
Cross Sectional ◽  
Energy Characteristics ◽  
Inductive Discharge ◽  
Cross Sectional Dimension ◽  
Pulsed Gas Discharge ◽  
First Time

An efficient pulsed gas-discharge inductive CO2-laser with a radiation energy of 1.05 J has been developed for the first time. In this case, the pulse duration of the laser radiation was about 10 msec. The maximum efficiency of 21.1% was obtained at a radiation energy of 340 mJ. RF current pulses propagated along the inductor conductor and, thus, an inductive discharge was formed to create an inverse population at the infrared (IR) transitions of CO2* molecules. The temporal and energy characteristics of the radiation of the inductive CO2-laser depending on the duration of the pump pulse are investigated. The spatial characteristics and spectrum of the radiation of the developed laser are estimated. The divergence of the laser radiation was 0.52 mrad. The cross-sectional dimension of the laser output beam was about 35 mm in diameter.

Investigation of the energy characteristics of a plasma created in air near a target by CO2 laser radiation

1984 ◽  
Vol 24 (5) ◽  
pp. 607-611
Author(s):  
G. G. Dolgov-Savel'ev ◽  
V. A. Zhuk ◽  
A. M. Orishich ◽  
A. G. Ponomarenko ◽  
V. G. Posukh ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Co2 Laser ◽  
Energy Characteristics ◽  
Co2 Laser Radiation

scholarly journals Новый люминофор ИК-диапазона на основе германата Sr-=SUB=-3-=/SUB=-La-=SUB=-2-=/SUB=-(Ge-=SUB=-3-=/SUB=-O-=SUB=-9-=/SUB=-)-=SUB=-2-=/SUB=- : Nd-=SUP=-3+-=/SUP=-, Ho-=SUP=-3+-=/SUP=-

2018 ◽  
Vol 60 (2) ◽  
pp. 358
Author(s):  
М.А. Мелкозерова ◽  
Я.В. Бакланова ◽  
О.А. Липина ◽  
А.Ю. Чуфаров ◽  
А.П. Тютюнник ◽  
...  
Keyword(s):  
Radiation Energy ◽  
Short Wave ◽  
Maximum Efficiency ◽  
Luminescence Spectra ◽  
Laser Radiation Energy ◽  
Precursor Method ◽  
Relaxation Energy ◽  
Infrared Luminescence ◽  
Concentration Dependences ◽  
First Time

AbstractCyclogermanate Sr_3La_2(Ge_3O_9)_2, isostructural to silicate Sr_3Er_2(Si_3O_9)_2, activated by neodymium and holmium is obtained for the first time by the precursor method. Ion Nd^3+ in the structure of Sr_3La_2(Ge_3O_9)_2 is a sensitizer of the infrared luminescence of Ho^3+. Excitation by radiation with a wavelength of 808 nm leads to a series of emission lines in the luminescence spectra of Sr_3La_2- x Nd_ x (Ge_3O_9)_2 : Ho^3+ in the short-wave and middle-IR ranges (1.0–3.4 μm). The highest intensity of lines at 2.1 and 2.7 μm, associated with the ^5 I _7 → ^5 I _8 and ^5 I _6 → ^5 I _7 transitions in the Ho^3+ ion, is found for compositions containing traces of holmium. Based on the analysis of the concentration dependences of the luminescence intensity, an optimal composition of the phosphor is determined, which ensures the maximum efficiency of conversion of laser radiation energy. The data obtained are interpreted in the assumption of cross-relaxation energy transfer from Nd^3+ to Ho^3+.

Energy characteristics of laser-oxygen cutting of steel by CO2-laser radiation

2012 ◽  
Vol 42 (7) ◽  
pp. 640-644 ◽  
Author(s):  
A G Malikov ◽  
Anatolii M Orishich ◽  
Viktor B Shulyat'ev
Keyword(s):  
Laser Radiation ◽  
Co2 Laser ◽  
Energy Characteristics ◽  
Co2 Laser Radiation

Pulsed Inductive Molecular Hydrogen Laser

2009 ◽  
Vol 4 (3) ◽  
pp. 12-19
Author(s):  
Aleksandr Razhev ◽  
Dmitriy Churkin ◽  
Alexey Zavyalov
Keyword(s):  
Laser Radiation ◽  
Pulse Duration ◽  
Cross Section ◽  
Molecular Hydrogen ◽  
Laser Emission ◽  
External Diameter ◽  
Inductive Discharge ◽  
Energy Parameters ◽  
Ring Shape ◽  
First Time

A pulsed inductive discharge molecular H2 laser has been created for the first time. The excitation system of a toroidal pulsed inductive discharge for molecular hydrogen electron levels excitation was developed. Generation at two wavelengths of 0,89 and 1,12 m was obtained. The spectral, temporal and energy parameters of laser emission under various pressures and pumping conditions were investigated. The maximum pulse power of 6,7 kW was achieved. The measured pulse duration was 18 ± 1 ns. In the cross-section, the laser radiation had the ring shape with an external diameter of 33 mm and thickness of 4 mm.

scholarly journals Lasers developed in the Institute of Atmospheric Optics of the SB RAS (a review)

2021 ◽  
Vol 9 (5) ◽  
pp. 417-429
Author(s):  
Anatolii Fedorov
Keyword(s):  
Peak Power ◽  
Radiation Power ◽  
Radiation Energy ◽  
Atmospheric Optics ◽  
Maximum Efficiency ◽  
Pulse Excitation ◽  
Nitrogen Laser ◽  
Transverse Excitation ◽  
Excimer Molecules ◽  
First Time

The results of research on the development of the first electric discharge lasers on active media N2, CO2, Cu, CuBr and excimer molecules at the Institute of Atmospheric Optics named after V. E. Zueva SB RAS are given. It created one of the world's first Cu-lasers with a pulse production of copper vapors due to the explosion of conductors and a transverse excitation discharge. For a copper laser, record specific generation parameters were obtained almost equal to the limit: radiation energy 2.4 J/l, peak power 120 MW/l with an efficiency of 0.16 %. For the CuBr laser operating in frequency mode, for the first time, an average radiation power of more than 100 W was obtained. In the dual pulse excitation mode, conditions were found that limit the growth of the efficiency of the CuBr laser. For him, a record efficiency of 2.7 % was obtained. For the first time, a nitrogen laser was developed with a maximum efficiency of 0.27 % with an energy of 0.8 mJ, a peak power of 160 kW. For the first time, a miniature XeCl laser with a longitudinal excitation discharge was developed, which worked both with and without buffer gases He, Ne and Ar.

Psychological Resilience Provides No Independent Protection From Suicidal Risk

Crisis ◽  
2016 ◽  
Vol 37 (2) ◽  
pp. 130-139 ◽  
Author(s):  
Danica W. Y. Liu ◽  
A. Kate Fairweather-Schmidt ◽  
Richard Burns ◽  
Rachel M. Roberts ◽  
Kaarin J. Anstey
Keyword(s):  
Risk Factors ◽  
Well Being ◽  
Current Status ◽  
Psychological Resilience ◽  
Cross Sectional ◽  
Life Project ◽  
Resilience Factors ◽  
First Time

Abstract. Background: Little is known about the role of resilience in the likelihood of suicidal ideation (SI) over time. Aims: We examined the association between resilience and SI in a young-adult cohort over 4 years. Our objectives were to determine whether resilience was associated with SI at follow-up or, conversely, whether SI was associated with lowered resilience at follow-up. Method: Participants were selected from the Personality and Total Health (PATH) Through Life Project from Canberra and Queanbeyan, Australia, aged 28–32 years at the first time point and 32–36 at the second. Multinomial, linear, and binary regression analyses explored the association between resilience and SI over two time points. Models were adjusted for suicidality risk factors. Results: While unadjusted analyses identified associations between resilience and SI, these effects were fully explained by the inclusion of other suicidality risk factors. Conclusion: Despite strong cross-sectional associations, resilience and SI appear to be unrelated in a longitudinal context, once risk/resilience factors are controlled for. As independent indicators of psychological well-being, suicidality and resilience are essential if current status is to be captured. However, the addition of other factors (e.g., support, mastery) makes this association tenuous. Consequently, resilience per se may not be protective of SI.

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