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Comparison of terahertz radiation spectra emitted from single-color IR and UV filaments 单色红外和紫外灯丝发射的太赫兹辐射光谱的比较
Pub Date : 2019-12-11 DOI: 10.1117/12.2543372
G. Rizaev, Y. Grudtsyn, A. Ionin, O. Kosareva, A. Koribut, Y. Mityagin, D. Mokrousova, N. Panov, S. Savinov, L. Seleznev, D. Shipilo
Emission of THz radiation from a single-color ultraviolet (248 nm) and infrared (744 nm) filament in air is studied experimentally and compared at similar pulse durations, focusing conditions and excess of peak pulse power over the critical power for self-focusing. An angular distribution of the terahertz emission for both ultraviolet and infrared pump is conical with the closed cone angle. In contrast, the terahertz radiation energy and spectrum differ significantly. The energy of terahertz emission from ultraviolet filament is 1-2 orders of magnitude lower than the terahertz yield from the infrared filament. The terahertz spectrum of ultraviolet filament is shifted to the low-frequency range and narrower as compared to the spectrum of terahertz emission from infrared filament. We explain qualitatively the difference in terahertz yields and spectra by lower intensity and plasma density in the ultraviolet filament. Similar behavior of THz spectra is observed when changing the IR filament parameters.
实验研究了单色紫外(248 nm)和红外(744 nm)灯丝在空气中的太赫兹辐射,并在相似的脉冲持续时间、聚焦条件和峰值脉冲功率超过自聚焦临界功率时进行了比较。紫外泵浦和红外泵浦的太赫兹发射角分布均为圆锥形,且呈闭锥角。相比之下,太赫兹辐射的能量和光谱差异很大。紫外灯丝的太赫兹发射能量比红外灯丝的太赫兹产生能量低1-2个数量级。紫外线灯丝的太赫兹光谱被移到低频范围内,与红外灯丝的太赫兹发射光谱相比,太赫兹光谱更窄。我们定性地解释了太赫兹产量和光谱的差异,通过较低的强度和等离子体密度在紫外线灯丝。当改变红外灯丝参数时,观察到类似的太赫兹光谱行为。
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引用次数: 1
Comparison of the characteristics of the light field in a one-dimensional photonic crystal with the harmonic dielectric constant obtained according to the theory of the perturbations and with the direct calculation 根据微扰理论得到一维光子晶体的谐波介电常数,并与直接计算结果进行了光场特性的比较
Pub Date : 2019-12-11 DOI: 10.1117/12.2548865
Aleksandr V. Kraiski, Anton A. Kraiski, M. Kazaryan
Previously, was developed the method for calculating the light field inside a one-dimensional photonic crystal using perturbation theory by the value detuning from the band edge and calculating using this method the resonance properties of spectral transparency windows adjacent to band edge of a photonic crystal. The method allows to find the field when light propagates with frequencies lying near the band edge by using a set of eigenfunctions corresponding to the band edge for an infinite medium. The analytical expressions are obtained to describe this field and its characteristics, through these eigenfunctions. In the present work, the solution errors obtained by this method are investigated in comparison with direct computer-aided calculation of the field for a medium with a harmonic variation of the dielectric constant under various conditions for implementing this method. The problems of limiting the set of used spatial harmonics when calculating eigenfunctions (2 or more), limiting the number of eigenfunctions involved in constructing a solution (2 or more) are considered.
在此之前,提出了利用微扰理论计算一维光子晶体内部光场的方法,利用该方法计算了光子晶体带边缘附近的光谱透明窗的共振特性。该方法利用一组与无限介质的带边相对应的本征函数,求出光以靠近带边的频率传播时的场。通过这些特征函数,得到了描述该场及其特征的解析表达式。在本工作中,研究了在实现该方法的各种条件下,用该方法得到的解的误差,并与直接计算机辅助计算介电常数有谐波变化的介质的场进行了比较。考虑了计算本征函数(2个或更多)时所使用的空间谐波集的限制问题,以及构造解(2个或更多)时所涉及的本征函数的数量的限制问题。
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引用次数: 0
Study of the temperature effect on the laser amplification process 温度对激光放大过程影响的研究
Pub Date : 2019-12-11 DOI: 10.1117/12.2550839
G. V. Kuptsov, V. Petrov, V. Petrov, A. V. Laptev, A. Kirpichnikov, E. Pestryakov
This paper is focused on the investigation of the effect of temperature on the laser amplification process. In case of Ybdoped active media there is a significant dependency of laser and physical properties on temperature that leads to reducing of gain coefficient. Theoretical description and experimental study carried out based on Yb:YAG crystal pumped by high power laser diode. Despite the cooling of the active element, the heating significantly affects at cwpumping regime and determines the shape of gain coefficient dependency on the pump power.
本文着重研究了温度对激光放大过程的影响。在掺镱的有源介质中,激光和物理性质对温度的依赖性很大,导致增益系数降低。基于高功率激光二极管泵浦的Yb:YAG晶体进行了理论描述和实验研究。尽管对有源元件进行了冷却,但加热对泵浦状态的影响很大,并决定了增益系数依赖于泵浦功率的形状。
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引用次数: 3
The impact of photoactivation on the antibacterial effect of nanoparticles obtained by pulsed laser ablation 光活化对脉冲激光烧蚀纳米颗粒抗菌效果的影响
Pub Date : 2019-12-11 DOI: 10.1117/12.2545864
D. Goncharova, Anna L. Nemoykina, Vadim O. Trufanov, S. Kulinich, V. Svetlichnyi
This paper studies the influence of photoactivation on the antibacterial activity of nanoparticles (NPs) obtained by pulsed laser ablation (PLA) of a brass target. The initial composition of the target is presented by a cubic phase is Cu65Zn35/Cu50Zn50. PLA in water was found to produce Cu2O and ZnO NPs. Generation of a different phase of brass (Cu85Zn15) was also observed. A number of studies was conducted to test the antibacterial properties of cotton treated with colloidal solution. Strain of S.aureus bacteria was used to evaluate antibacterial activity of prepared NPs, and it turned out to be high enough; an additional exposure of red light (610 nm) did not induce any changes in the antibacterial activity of the samples. Irradiation of the "soft" ultraviolet (365 nm) led to a sharp spike of the antibacterial activity an d complete death of bacteria.
本文研究了光活化对脉冲激光烧蚀黄铜靶材制备的纳米颗粒抗菌活性的影响。靶材的初始组成为Cu65Zn35/Cu50Zn50立方相。发现PLA在水中产生Cu2O和ZnO NPs。还观察到铜的不同相(Cu85Zn15)的生成。对胶体溶液处理棉花的抗菌性能进行了试验研究。利用金黄色葡萄球菌菌株对制备的NPs进行抑菌活性评价,结果表明NPs具有较高的抑菌活性;额外的红光照射(610 nm)没有引起样品抗菌活性的任何变化。“软”紫外线(365 nm)照射导致抗菌活性急剧上升,细菌完全死亡。
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引用次数: 1
Influence of phase and amplitude distortions of initial beam profile on the characteristics of filamentation domain 初始光束相位和振幅畸变对成丝畴特性的影响
Pub Date : 2019-12-11 DOI: 10.1117/12.2554667
D. V. Apeksimov, P. A. Babushkin, A. Zemlyanov, A. M. Kabanov, G. Matvienko, V. Oshlakov, A. V. Petrov
The results of experimental research of the filamentation of femtosecond laser pulses using a bimorph deformable mirror, which allows controlling the position of the filamentation domain determining localization of filaments and high-intensity channels in the beam cross section. The introduction of distortions into the amplitude profile of the beam with using masks showed the inability to control the number and position of filaments in the beam cross section.
利用双晶形可变形反射镜对飞秒激光脉冲的成丝进行了实验研究,该实验可以控制成丝域的位置,确定光束截面上的丝和高强度通道的定位。利用掩模在波束的振幅分布中引入畸变,表明无法控制波束截面中细丝的数量和位置。
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引用次数: 0
Use of longwave remote sensing for aerosol research 长波遥感在气溶胶研究中的应用
Pub Date : 2019-12-11 DOI: 10.1117/12.2554946
A. Karapusikov, A. Klimkin, G. Kokhanenko, A. Kuryak, K. Osipov, Y. Ponomarev, Zhang Shuo
In the report the results of experiments on the registration of IR radiation backscattering from organic aerosol are presented and discussed. The studies were conducted on the bench for prototyping lidar measurements at a controlled optical way. Water aerosol and water aerosol containing organic components like tryptophan, alcohol, glycerin, and reduced nicotinamide adenine dinucleotide (NADH) served as model media. For these experiments we have modified the experimental set up under replacing UV laser on IR one -- a tunable waveguide CO2- laser. The IR photodetector MCT cooled by liquid nitrogen was used. As a result of the study, the ability to discriminate a number of aerosols among themselves by difference of the absorption spectra under CO2- laser wavelength tuning was demonstrated. It can be used in remote sensing of the different types of organic aerosols.
本文介绍并讨论了有机气溶胶红外辐射后向散射配准的实验结果。在实验台上进行了激光雷达控制光学测量样机的研究。水气溶胶和含有色氨酸、酒精、甘油和还原性烟酰胺腺嘌呤二核苷酸(NADH)等有机成分的水气溶胶作为模型介质。为了这些实验,我们对红外激光器取代紫外激光器的实验装置进行了改进——可调谐波导CO2激光器。采用液氮冷却的红外光电探测器MCT。研究结果表明,在CO2激光波长调谐下,通过不同的吸收光谱可以区分不同的气溶胶。它可以用于遥感不同类型的有机气溶胶。
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引用次数: 2
Radiation in diamond, leucosapphire, and quartz under the excitation of electron beam with an energy of up to 400 keV 在能量高达400kev的电子束激发下,钻石、白蓝宝石和石英中的辐射
Pub Date : 2019-12-11 DOI: 10.1117/12.2550953
V. Tarasenko, V. Oleshko, E. Lipatov, M. Erofeev
The paper presents measurement data on the radiation excited in synthetic diamonds, leucosapphire, and quartz KU1 at a wavelength of 200–800 nm by a pulsed electron beam with an energy of up to 400 keV. The crystals reveal wide bands whose intensity increases with decreasing wavelength in the range 220–400 nm. For leucosapphire and quartz, the radiation pulse at these wavelengths is close in duration to the electron beam current pulse, suggesting that it is Cherenkov radiation. For synthetic diamonds, both Cherenkov radiation and pulsed cathodoluminescence are detected in this spectral region. In particular, an intense band of free excitons with its maximum at 235 nm is found at high beam current densities and electron energies.
本文介绍了在200 ~ 800 nm波长内,用能量高达400 keV的脉冲电子束激发合成金刚石、白玉和石英KU1的辐射的测量数据。在220 ~ 400 nm范围内,晶体呈现出宽波段,其强度随波长的减小而增大。对于白蓝宝石和石英,这些波长的辐射脉冲在持续时间上接近电子束电流脉冲,这表明它是切伦科夫辐射。对于人造钻石,切伦科夫辐射和脉冲阴极发光都在这个光谱区域被检测到。特别是,在高束流密度和高电子能量下,发现了一个在235 nm处最大的自由激子带。
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引用次数: 0
Terahertz nonlinear waveguide-antenna driven by a femtosecond laser 飞秒激光驱动的太赫兹非线性波导天线
Pub Date : 2019-12-11 DOI: 10.1117/12.2548968
A. Nikoghosyan, M. Kazaryan
An active waveguide-antenna in which the nonlinear crystal is the source of THz radiation is considered. The coherent terahertz radiation generated via optical rectification of 100 fs pulses of a Ti: sapphire laser in a system of a “nonlinear optical crystal partially filling the cross section of a metal rectangular waveguide” is investigated. It is shown that the fulfillment of the phase-matching condition and the optimization of the characteristics of radiation transmission through the integrated system “nonlinear crystal + waveguide” affect the efficiency of generation of THz radiation.
研究了一种以非线性晶体为太赫兹辐射源的有源波导天线。研究了Ti:蓝宝石激光器在“非线性光学晶体部分填充金属矩形波导截面”系统中100 fs脉冲光整流产生的相干太赫兹辐射。结果表明,相位匹配条件的满足和“非线性晶体+波导”集成系统中辐射传输特性的优化影响太赫兹辐射的产生效率。
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引用次数: 0
Optical characteristics of natural water samples collected in 2015-2017 in the supralittoral zone of the Alaid Volcano, the Kuril Islands 千岛群岛Alaid火山上滨海带2015-2017年自然水样的光学特征
Pub Date : 2019-12-11 DOI: 10.1117/12.2540278
L. Anikin, O. Lunina, S. Patsaeva, V. Rashidov, A. Zhiltsova
The work presents the results of spectroscopic study of the natural water with microorganisms from the splash baths in the Atlasov Island (the Alaid Volcano). The Alaid Volcano is the highest, northernmost and one of the most active volcanoes of the Kuril Islands, the unique object for interdisciplinary research. In 2015 within the supralittoral zone of the island the several splash pools filled with colored marine water were discovered for the first time. The paper presents the results of spectral measurements and microbiological studies performed on natural water samples taken in 2015-2017 from the supralittoral zone of the Alaid Volcano, the Kuril Islands, as well as the photosynthetic microorganisms cultivated from those samples in laboratory. The absorption spectra of the native samples and the cultures of photosynthetic bacteria cultivated from original water demonstrated pronounced maxima at 380, 590, 806, 854 nm wavelengths and the shoulders peaked at 510, 590 and 890 nm. The observed absorption maxima revealed the presence of bacteriochlorophyll а, the main photosynthetic pigment of purple sulfur bacteria, and additionally the cells of purple sulfur bacteria Thiocystis and Thiorhodococcus morphotypes were detected in water under microscope. Observation of water colored by photosynthetic microbes in different parts of the Atlasov Island within several summer seasons in 2015-2017 allowed us to conclude that the development of the purple phototrophic bacteria in the splash baths above the littoral zone is not an accidental event, but the stable phenomenon. On the other Kuril Islands similar splash baths have not been encountered yet.
这项工作介绍了在阿特拉索夫岛(Alaid火山)的溅水浴中微生物的自然水的光谱研究结果。阿莱德火山是千岛群岛最高、最北端和最活跃的火山之一,是跨学科研究的独特对象。2015年,在岛上的沿海地带首次发现了几个充满彩色海水的溅水池。本文介绍了2015-2017年在千岛群岛Alaid火山沿岸上带采集的天然水样的光谱测量和微生物学研究结果,以及从这些样品中培养的光合微生物。天然样品和从原始水中培养的光合细菌的吸收光谱在380、590、806、854 nm波长处有明显的最大值,肩部在510、590和890 nm处达到峰值。在显微镜下观察到紫色硫细菌的主要光合色素细菌叶绿素的存在,并在水中检测到紫色硫细菌的硫囊菌和硫球菌形态。在2015-2017年的几个夏季,通过对阿特拉索夫岛不同地区光合微生物着色的水的观察,我们得出结论,在沿海地带上方的水花浴池中,紫色光合细菌的发展不是偶然事件,而是稳定的现象。在其他千岛群岛上还没有遇到类似的水花浴。
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引用次数: 1
Dynamic characteristics of a laser system for controlling an object's impact 用于控制物体撞击的激光系统的动态特性
Pub Date : 2019-12-11 DOI: 10.1117/12.2550625
S. Arakelyan, A. A. Asratyan, V. L. Evstigneev, M. Kazaryan, M. Gerke, A. Galkin, S. Zhirnova, A. Osipov, G. Evstyunin, E. Shamanskaya, R. Zakharyan, A. S. Averyushkin, O. Andrienko, P. I. Ivashkin
Presents the operation of a system for monitoring the process of laser processing of the surface of materials in real time, with a resolution of the order of several tens of nanoseconds, with a micron-scale spatial resolution designed to visualize laser-induced dynamic processes directly during laser processing of the surface of an object. The basic physical principles of its operation and the problems existing at the same time, as well as the prospects for overcoming them in various conditions of specific processes of laser thermal strengthening, including using computer simulation to search for optimal optical circuits and modes. The dynamic characteristics of the laser monitoring system are given.
介绍了一种用于实时监测材料表面激光加工过程的系统的操作,该系统的分辨率为几十纳秒,其微米尺度的空间分辨率旨在直观地显示物体表面激光加工过程中激光诱导的动态过程。介绍了其工作的基本物理原理和同时存在的问题,以及在各种条件下激光热强化的具体过程中克服这些问题的前景,包括利用计算机模拟寻找最佳光电路和模式。给出了激光监测系统的动态特性。
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引用次数: 0
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Atomic and Molecular Pulsed Lasers
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