Atomic and Molecular Pulsed Lasers最新文献

{"title":"DNA destruction under the influence of VUV radiation","authors":"G. Zvereva, I. Y. Kirtsidely, E. M. Machs","doi":"10.1117/12.2613831","DOIUrl":"https://doi.org/10.1117/12.2613831","url":null,"abstract":"In the work were investigated the effect of vacuum ultraviolet (VUV) radiation (λ=147 nm, 173 nm) on the DNA of microscopic fungi spores of the species Rhodotorula colostri, Aurobasidium pullulans (colored and uncolored types), Cladosporium herbarum containing different types of protective pigments. The DNA molecules inside the spores (in vivo) and isolated from them (in vitro) were irradiated. The results of electrophoresis showed, that VUV irradiation leads to the appearance of light DNA fragments with sizes 100-750 base pairs, as well as high molecular weight fragments containing more than 20 000 base pairs. The greatest features were observed during the irradiation of Rhodotorula colostri DNA: 1) were formed longer fragments (100-750 base pairs); 2) at λ=172 nm threshold effect was observed: DNA destruction appeared starting from radiation energies of 35 mJ/cm2 during in vivo irradiation and, starting from radiation energies of 20 mJ/cm2, during in vitro irradiation; 2) when irradiated at the wavelength λ=147 nm, the relative destruction of DNA increased, while for other types of the spores it fell. These features can be explained by the presence in Rhodotorula colostri spores of carotene capable of exercising both the properties of the antioxidant and to produce reactive radicals. When irradiated at a wavelength of λ=173 nm in vivo and in vitro, each type of spore had the same characteristic features, which may indicate a small effect on DNA of free water molecules photolysis products. When irradiated at the wavelength λ=147 nm, the influence of melanin was observed: in melanin containing spores the results in vivo and in vitro exposure had the same characteristic features, in the spores without melanin- differed. In the first case, this can be explained by a smaller concentration of reactive radicals due to VUV radiation absorption by melanin, in the second - participation in the DNA destruction of free water molecules photolysis products. A common feature of the electrophoresis results was the presence of long DNA fragments of about 20,000 base pairs in all types of spores. The brightness of these fragments correlated with the DNA destruction degree.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114760279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single wall carbon nanotubes and their conjugates with dimeric phthalocyanine complexes of Cu for optical limiters in the protection of photosensitive detectors and micro-optoelectromechanical systems","authors":"M. Savelyev, P. Vasilevsky, A. Tolbin, A. Gerasimenko","doi":"10.1117/12.2606048","DOIUrl":"https://doi.org/10.1117/12.2606048","url":null,"abstract":"To protect photosensitive detectors and micro-optoelectromechanical systems, protective equipment is needed against the ingress of powerful laser radiation. Conventional color filters pose a problem for such devices by cutting out the region of the spectrum in which the laser operates. To ensure the possible operation, passive limiters based on nonlinear optical effects can be used. They are capable of transmitting non-hazardous laser radiation with insignificant attenuation (transmission of the order of 70%), and when hit by powerful laser radiation they can quickly darken. The urgency of this problem only increases with the development and widespread use of laser systems. In particular, when using lidars, receiving photosensitive detectors are often damaged. The use of various conjugates with carbon nanotubes is promising for creating limiters. In this work, it is proposed to use conjugates of dimeric phthalocyanine complexes of Cu to create nonlinear optical materials. This material demonstrates the ability to attenuate laser radiation with a nanosecond duration of 16 ns, even in the case of single pulses, due to the synergistic effect of absorption and scattering of radiation. In addition, in the case of 140 fs femtosecond periodic radiation, with a pulse repetition rate of 80 MHz, this material demonstrates the attenuation of radiation when using a cut-off diaphragm due to the effect of self-phase modulation (SSPM). The characteristics of the SSPM pattern were studied, it was noted that the outer rings have the greatest width. In general, the width of the rings gradually increases with distance from the center of the beam. At the same time, the peak fluence (highest fluence value) of each ring is approximately the same, with the exception of the central part. In the central region, a strong effect is observed from heated flows tending upward and thus strongly violating symmetry.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128199621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A smart data control system for environment recognition lidar on Zynq SoCs","authors":"Ru-qing Liu, Jing-guo Zhu, Feng Li, Yan Jiang, Cheng-hao Jiang, Zhe Meng, Zhengyu Zhang","doi":"10.1117/12.2613429","DOIUrl":"https://doi.org/10.1117/12.2613429","url":null,"abstract":"Nowadays, laser ranging is widely used in industrial and security fields. As one of the most well-known pulse laser detection system, Lidar is a much effective equipment for environmental recognition. Currently, research on autonomous and smart vehicles technology has been growing exponentially in recent years by integrating more and more smart hardware or software inside. Most studies are almost based on non-real-time operating system with random delays, which leads to lag and inaccuracies in the received data. Based on a self-developed three-dimensional Lidar, a smart embedded system for real-time data transmission on the FPGA Zynq is proposed. The real-time signal acquisition and transmission system is implemented and verified in the three-dimensional imaging experiments system. In this system, verilog code is applied for Lidar data control acquisition and transmission. C/C++ code is used for data calculation and uploading the point cloud data to the computer through the network to realize the real-time display of point cloud. Experimental results demonstrate that the Lidar data are correctly read by the FPGA board. In addition, the real time data acquisition meets the requirements of control and real time data acquisition and procession at 20fps. The proposed approach provides a very useful basic platform for many applications using Lidar as a sensor and will improve their detection accuracy.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127517338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Light scattering by large irregular ice crystals of cirrus clouds","authors":"N. Kustova, A. G. Borovoi, A. Konoshonkin, Zhenzhu Wang","doi":"10.1117/12.2605256","DOIUrl":"https://doi.org/10.1117/12.2605256","url":null,"abstract":"The scattering matrixes for randomly oriented large particles of faceted shapes have been calculated using both the geometrical optics and physical optics approximations. We showed that the scattering matrixes are different for regular and irregular particle shapes since the corner reflection effect is predominant at the backward direction for the regular shapes. In the case of irregular shapes, the scattering matrixes have the common feature. Namely, the elements of the matrix reveal near the backward scattering direction some typical peaks that are explained by interference of the backscattered waves. In particular, the negative polarization effect known in astrophysics can be explained by the interference.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131108972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Features of the xenon excimer VUV spectra formation","authors":"G. Zvereva","doi":"10.1117/12.2614089","DOIUrl":"https://doi.org/10.1117/12.2614089","url":null,"abstract":"The change in the shape of xenon dimers second continuum spectrum (3,1Σ+u→1Σ+g), excited in a barrier discharge (P = 300 Torr), depending on the gas temperature is studied. It was found that an increase in the gas temperature from Т = 500 K to 1300 K leads to a broadening of the continuum at half maximum from Δλ = 15 nm to Δλ = 20.5 nm and a shift of its maximum to the short-wave region from λ = 173.2 nm to λ = 172.5 nm. The relative increase in intensity occurred in the short-wavelength wing, while the position of the short-wavelength continua boundary did not depend on temperature.The shape of the second continuum of krypton dimers experienced much smaller changes under similar excitation conditions, which was explained by the lower heating of the gas and the lower change in the relative population of the vibrational levels.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133658095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of the scattering phase function in the interaction of ultrashort laser pulses with a drop and aerosol in a nonlinear mode","authors":"P. Babushkin, A. Bulygin, E. Danilkin, O. Kuchinskaya, O. Minina, A. V. Petrov","doi":"10.1117/12.2606961","DOIUrl":"https://doi.org/10.1117/12.2606961","url":null,"abstract":"The propagation of ultrashort laser pulses in the atmosphere is accompanied by nonlinear effects. The most low-threshold of them is the effect of cubic nonlinearity along with nonlinear absorption manifesting in aerosol. This effect should lead to the transformation of the scattering phase function formed in a liquid droplet aerosol. To study this effect, numerical and experimental studies on droplets of various sizes and geometries were carried out. As expected, the cubic nonlinearity inclusion should lead to an increase in the effect of backward scattering.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128305669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Specifics of multiple filamentation formation for femtosecond laser radiation with topological charge","authors":"A. Bulygin, A. Zemlyanov","doi":"10.1117/12.2602421","DOIUrl":"https://doi.org/10.1117/12.2602421","url":null,"abstract":"Evolution of local instability in a ring vortex beam propagating in the turbulent atmosphere with highest nonlinearities of the refractive index as well as in uence of the effective characteristics of the light beam is investigated based on numerical calculation of the nonlinear Schrodinger equation with high-order nonlinearities. Propagation of high-power femtosecond laser radiation (HPFLR) with topological charge in the random medium under overlap of an amplitude-phase mask and an original beam is considered. Depending on the mask configuration and initial radiation power, rotation of the beam can lead both to converge and growth more distant of filamentation beginning as well as extension of filamentation area by two and more times.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"12086 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129407935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pulse-periodical TEA-CO2 laser with wavelength tuning and pulse energy up to 1.5 J and duration up to 100 ns","authors":"B. Kozlov, D. S. Makhanko, A. Y. Payurov","doi":"10.1117/12.2613560","DOIUrl":"https://doi.org/10.1117/12.2613560","url":null,"abstract":"The conditions for the formation of stable volume discharges at atmospheric pressure in CO2–laser mixtures with an increased content of carbon dioxide and providing the generation of laser radiation pulses in the form of a \"giant peak\" with a base duration of up to 100 nanoseconds and a radiation energy of up to 1.5 J are determined. With the help of a selective resonator, a discrete rearrangement of radiation on individual vibrational–rotational transitions in the wavelength range of 9.2–10.8 μm is realized. The operation of the TEA–CO2 laser at pulse repetition frequencies up to 50 Hz is ensured.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"66 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132812273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active medium parameters of molecular nitrogen ions in air laser plasma","authors":"I. A. Zyatikov, V. Losev, V. Prokopev","doi":"10.1117/12.2613928","DOIUrl":"https://doi.org/10.1117/12.2613928","url":null,"abstract":"In this work, self-seeded lasing pulse duration of the В2Σ+u – X2Σ+g transition of molecular nitrogen ion in air laser plasma at different pump pulse focusing conditions was investigated. Pumping was carried out at the central wavelength of 950 nm, with 60 fs duration (FWHM), and 10 mJ energy. It was shown that lasing pulse duration increases from 1.15 to 4.6 ps, and unsaturated gain coefficient decreases from 6.7 to 4.2 with decreasing pump pulse intensity when geometrical focus length was increased. An explanation for picosecond lasing duration at femtosecond seed amplification is proposed.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123530312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generation mode of runaway electron beams with high amplitude in atmospheric pressure air","authors":"V. Tarasenko, D. Beloplotov, D. Sorokin, M. Lomaev, E. Baksht, A. Burachenko","doi":"10.1117/12.2616494","DOIUrl":"https://doi.org/10.1117/12.2616494","url":null,"abstract":"The results of experimental studies of various generation modes of runaway electron beams (RAEBs) are presented. The main attention is paid to the mode when the RAEB with the highest amplitude are generated in air at atmospheric pressure. Other modes are discussed too: the most implemented and often mentioned by other authors generation mode as well as the mode when RAEB is generated after breakdown.","PeriodicalId":205170,"journal":{"name":"Atomic and Molecular Pulsed Lasers","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122155472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}