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Improved calculation of the Mie solution and the geometrical optics approximation for large droplets 大液滴的米氏解法和几何光学近似的改进计算
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-05 DOI: 10.1088/1555-6611/ad0ec1
D. N. Gabyshev, R. M. Ganopolsky
{"title":"Improved calculation of the Mie solution and the geometrical optics approximation for large droplets","authors":"D. N. Gabyshev, R. M. Ganopolsky","doi":"10.1088/1555-6611/ad0ec1","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0ec1","url":null,"abstract":"This article considers energy distribution of light inside a uniformly illuminated transparent water droplet. Two methods are used: the geometrical optics approximation and the Mie solution derived from wave optics. The authors describe in detail calculation algorithms suitable for efficient computer implementation and ways to improve them. In the limit for large droplets, both similarities and differences between the methods are pointed out. Resonant states are discussed, when the usually dark regions of the droplet turn out to be illuminated.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"26 12","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural changes in the crystal lattice in enamel under Er,Cr:YSGG laser irradiation and oven heated by Rietveld analysis 通过里特维尔德分析法研究珐琅质在 Er,Cr:YSGG 激光辐照和烘箱加热条件下的晶格结构变化
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-12-04 DOI: 10.1088/1555-6611/ad0cb2
Astro Ltd, J. S. R. Neto, P. A. D. Ana, V. L. Mazzocchi, E. G. Valério, D. Zezell
{"title":"Structural changes in the crystal lattice in enamel under Er,Cr:YSGG laser irradiation and oven heated by Rietveld analysis","authors":"Astro Ltd, J. S. R. Neto, P. A. D. Ana, V. L. Mazzocchi, E. G. Valério, D. Zezell","doi":"10.1088/1555-6611/ad0cb2","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0cb2","url":null,"abstract":"Changes in the crystal lattices and compositions of the dental enamel powders were evaluated after oven or Er,Cr:YSGG laser irradiation. A decrease in the Ca/P ratio to levels close to the ideal theoretical value of laser irradiation caused a considerable decrease in the hydroxyapatite crystallite size but without changes in the crystallographic phase. These changes alter the material, can affect the demineralization process, and are useful for the prevention of caries and dental erosion.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"6 9","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Peer Support and Second Victim Programs for Anesthesia Professionals Involved in Stressful or Traumatic Clinical Events. 为涉及紧张或创伤性临床事件的麻醉专业人员提供同伴支持和第二受害者计划。
4区 物理与天体物理
Laser Physics Pub Date : 2023-12-01 Epub Date: 2023-07-11 DOI: 10.1016/j.aan.2023.05.003
Robyn E Finney, Adam K Jacob
{"title":"Peer Support and Second Victim Programs for Anesthesia Professionals Involved in Stressful or Traumatic Clinical Events.","authors":"Robyn E Finney, Adam K Jacob","doi":"10.1016/j.aan.2023.05.003","DOIUrl":"10.1016/j.aan.2023.05.003","url":null,"abstract":"<p><p>Modern anesthetic care is very safe, but stressful and traumatic clinical events may occur. When they occur, anesthesia professionals are vulnerable to second victim experiences, resulting in significant and long-lasting psychological and emotional consequences if not addressed. Peer support can help anesthesia professionals cope with the negative effects of second victim experiences.</p>","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"21 1","pages":"39-52"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85969989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser speckle-based estimation of surface condition for designing quieter material 基于激光斑点的表面状况估算，用于设计更安静的材料
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-30 DOI: 10.1088/1555-6611/ad0ec0
Mausumi Mahapatra, Priyanka P Singh, Ganeswar Nath
{"title":"Laser speckle-based estimation of surface condition for designing quieter material","authors":"Mausumi Mahapatra, Priyanka P Singh, Ganeswar Nath","doi":"10.1088/1555-6611/ad0ec0","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0ec0","url":null,"abstract":"Laser speckle is a non-contact, non-interfering, non-destructive, rapid and controllable technique with a large area of coverage that has attracted much attention for surface analysis of materials. The emergence of different natural cellulosic materials as potential candidates for the replacement of synthetic ones is promising, but their sustainability from the point of view of material design is still in question. Machining of the surface of cellulosic components for making sound-dampening materials has a critical effect on determining their surface condition. Laser speckle is an emerging tool for surface analysis of a variety of materials, and it has important applications in material design and analysis. As a cutting-edge research tool, ultrasonic wave technology has maintained a significant contribution to the design and structural monitoring of composite materials. The present work uses date palm leaf fibers for composite reinforcement. The sound-dampening properties, such as sound absorption and transmission, were analyzed on the basis of surface roughness observed with the laser speckle technique and modified by ultrasonically blended surfactants. The surface roughness of the synthesized material was found to increase with sonication time with an <italic toggle=\"yes\">R</italic>\u0000<sup>2</sup> value of 0.944 and observed fluctuation in roughness data on the surface of the material. The sound absorption coefficient is 0.98 with a transmission loss of 60 dB, for which the material is classified as an ASTM E1050 Class A acoustic material. Further, the method of laser speckle-based roughness estimation is found to be potential tool for the design of any type of quieter material.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"2018 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of x-ray bremsstrahlung generation under vacuum heating of solid target electrons 模拟固体靶电子在真空加热条件下产生的 X 射线轫致辐射
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-30 DOI: 10.1088/1555-6611/ad0ec2
O F Kostenko
{"title":"Simulation of x-ray bremsstrahlung generation under vacuum heating of solid target electrons","authors":"O F Kostenko","doi":"10.1088/1555-6611/ad0ec2","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0ec2","url":null,"abstract":"An extended Brunel model of hot electron generation in nonrelativistic laser-plasma interactions is considered. The model takes into account the permittivity of the surface plasma and the energy absorbed by electrons accelerated by the electric field components perpendicular and parallel to the target. A model for the generation of x-ray bremsstrahlung in the case of a Gaussian laser beam is presented. It is shown that the influence of electron motion parallel to the plasma surface on the absorbed intensity becomes distinguishable only at relatively low absolute values of the permittivity. Calculations of the dependences of the yield of hard bremsstrahlung x-rays on the angle of incidence of laser radiation and on the energy interval in which the yield of bremsstrahlung is measured are in qualitative agreement with the experimental data, if we assume that the electron concentration in the skin layer is relatively low (approximately 5–7 times the critical concentration).","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"2018 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A five-level cold atomic system for the orbital angular momentum exchange based on a four-wave mixing setup 基于四波混合设置的轨道角动量交换五级冷原子系统
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-24 DOI: 10.1088/1555-6611/ad06a0
E Ali, S M Husein Kamona, T Kh Hussein, H A Abbas, F A Rasen, M S Alhassan, S M Hameed, D N Al-Saidi, A Alawadi, A Alsalamy
{"title":"A five-level cold atomic system for the orbital angular momentum exchange based on a four-wave mixing setup","authors":"E Ali, S M Husein Kamona, T Kh Hussein, H A Abbas, F A Rasen, M S Alhassan, S M Hameed, D N Al-Saidi, A Alawadi, A Alsalamy","doi":"10.1088/1555-6611/ad06a0","DOIUrl":"https://doi.org/10.1088/1555-6611/ad06a0","url":null,"abstract":"In this paper, we suggest a theoretical model for the exchange of the orbital angular momentum (OAM) state of laser fields in a real cold atomic system for realization in an experimental setup. By using four-wave mixing (FWM) processes, we study the spatial dependence of the new weak generated signal light under electromagnetically induced transparency conditions when one of the laser lights becomes an optical vortex. We discuss the spatial dependence of FWM processes via experimental parameters for different conditions of the OAM of vortex light. We have found that the intensity and phase distributions of the new generated light depends strongly on the OAM number of the optical vortex light. Moreover, we investigate the absorption spectrum of the new generated signal light for different OAM of the optical vortex light. Our obtained results may have potential applications in quantum information science.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"175 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138685339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multipulse operation in Mamyshev oscillator: influence of external seed source 马迈雪夫振荡器中的多脉冲运行：外部种子源的影响
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-24 DOI: 10.1088/1555-6611/ad0cb4
Anshuman Nigam, Pradeep K Gupta, C P Singh, Bhuvnesh1, P K Mukhopadhyay, R Arya, S K Dixit
{"title":"Multipulse operation in Mamyshev oscillator: influence of external seed source","authors":"Anshuman Nigam, Pradeep K Gupta, C P Singh, Bhuvnesh1, P K Mukhopadhyay, R Arya, S K Dixit","doi":"10.1088/1555-6611/ad0cb4","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0cb4","url":null,"abstract":"We study the influence of an external seed source on the startup of a fiber Mamyshev oscillator (MO). Depending on the seed source parameters, while keeping MO parameters fixed, we observe diverse mode-locked operations from the MO, generating stable single, double, triple and even up to a group of seven pulses. The probability of the occurrence of such mode-locked operations is studied. There can be different operating regimes in a particular multipulse operation. We find that there is an optimum spectral width of the seed source for which the probability of generating mode-locked stable train of single pulses from a fiber MO is maximum. Further, we find that the power of the seed source has less influence on the mode-locking state of the fiber MO; however, the probability of single or double pulse operation is relatively higher than that of multipulse operation at higher power of the seed source. These experimental observations will enrich the database of multipulse patterns and help in understanding pulse dynamics in the fiber MO. Suitably chosen seed source parameters can generate the desired pulse pattern. Such tailored outputs could have prospective applications in laser micromachining and high bit rate data transfer in optical networks.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"30 1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of intensity error on temperature estimation in laser-induced breakdown spectroscopy: a numerical study 激光诱导击穿光谱中强度误差对温度估算的影响：数值研究
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-24 DOI: 10.1088/1555-6611/ad0cb3
Lekha Mary John, K K Anoop
{"title":"Impact of intensity error on temperature estimation in laser-induced breakdown spectroscopy: a numerical study","authors":"Lekha Mary John, K K Anoop","doi":"10.1088/1555-6611/ad0cb3","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0cb3","url":null,"abstract":"Laser-induced breakdown spectroscopy (LIBS) is a cutting-edge technique for the compositional analysis of multi-element materials. Under standard circumstances for laser-induced plasma (<italic toggle=\"yes\">T</italic>\u0000<sub>e</sub> = 1 eV and <italic toggle=\"yes\">N</italic>\u0000<sub>e</sub> = 10<sup>16</sup> cm<sup>−3</sup>), we simulated the emission spectrum of a binary alloy (with 70 wt.% Cu–30 wt.% Al). We used the Saha ionization equilibrium formulas to calculate the population of neutral and ionized species of each constituent element, and the Boltzmann distribution to estimate the intensities of emission lines with radiative transition probabilities. The Stark broadening equation is then used to determine the line broadening, yielding a Lorentzian profile for each line. The sum of line emissions of all constituent species will approximate the alloy’s LIBS spectra in an assumption of ideal analytical plasma. Then, we generated random errors in the intensities of spectral lines ranging from 5% to 35%. To investigate temperature estimation accuracy, we utilized three well-established approaches: the Boltzmann plot (BP) method, the Saha–Boltzmann plot (SBP) method, and the Multi-elemental SBP (MESBP) method. As intensity error increases from 5% to 35%, the estimated temperature in the BP method deviates from 0.25% to 18.3%. Whereas the intensity error is almost unaffected using the SBP method and the MESBP method. The temperature deviation is less than 2% in both situations. This study is relevant to calibration-free LIBS, in which the exact temperature determination is crucial for the abundance estimation of trace, major, and minor elements.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"34 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The vortex light induced electric dipole and electric quadru-pole transition in Ca atom 钙原子中涡旋光诱导的电偶极子和电四极子转变
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-23 DOI: 10.1088/1555-6611/ad0a77
Zhenzhong Lu, Min Liu, Ce Feng, Jiannan Zhou
{"title":"The vortex light induced electric dipole and electric quadru-pole transition in Ca atom","authors":"Zhenzhong Lu, Min Liu, Ce Feng, Jiannan Zhou","doi":"10.1088/1555-6611/ad0a77","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0a77","url":null,"abstract":"The Laguerre–Gaussian beam induced electric transition model is presented. The major mechanism of angular momentum exchange between the light and the atomic system is discussed. The influence of the topological charge on the transition probability and selection rules is obtained. Our results show that the Ca(4s<sup>2 1</sup>S<sub>0</sub>–4s3d <sup>1</sup>D<sub>2</sub>) electric quadrupole transition selection rules are sensitive to the sign of <italic toggle=\"yes\">l</italic>, and the center of mass transition selection rules are governed by the topological charge <italic toggle=\"yes\">l</italic> of the light. The electric dipole transition is possible in a field with topological charge <italic toggle=\"yes\">l</italic> &gt; 0, and the quadrupole transition is no longer forbidden. The overall transition probability difference between dipole transition and quadrupole transition can be decreased by the joint action of the light angular momentum exchange with the external and the internal motion.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"51 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138684973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Highly sensitive temperature sensor using nested hollow-core anti-resonant fibers 使用嵌套空芯抗谐振纤维的高灵敏温度传感器
IF 1.2 4区 物理与天体物理
Laser Physics Pub Date : 2023-11-16 DOI: 10.1088/1555-6611/ad0a76
Xiao Yue-Yu, Lai Yan-Xiang, Yao Rui-Ming
{"title":"Highly sensitive temperature sensor using nested hollow-core anti-resonant fibers","authors":"Xiao Yue-Yu, Lai Yan-Xiang, Yao Rui-Ming","doi":"10.1088/1555-6611/ad0a76","DOIUrl":"https://doi.org/10.1088/1555-6611/ad0a76","url":null,"abstract":"A highly sensitive temperature sensor based on composite nested negative curvature hollow-core fiber is proposed. Three resonant tubes are nested inside the cladding tubes to induce a resonant coupling between the fundamental core mode and the dielectric mode of the nested resonant tube. Three glass-sheet conjoined nested tubes are introduced to suppress the comparatively low loss higher-order mode LP<sub>02</sub>. All the air-holes are filled with temperature-sensitive liquid of ethanol. As the temperature changes, the resonant dip in the transmission spectrum corresponding to the coupling will shift. Numerical simulation results indicate that the temperature sensitivity is 3.36 nm °C<sup>−1</sup> in the range of 20 °C–40 °C. Since there is no need of any special post-processing, such as selective infiltration or material coating for the sensors proposed, the sensor provides a promising mechanism for the optical fiber temperature sensing.","PeriodicalId":17976,"journal":{"name":"Laser Physics","volume":"5 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138685567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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