The Experts below are selected from a list of 45342 Experts worldwide ranked by ideXlab platform
Huan Yang - One of the best experts on this subject based on the ideXlab platform.
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theoretical exploration of Laser Parameter effects on the generation of an isolated attosecond pulse from two color high order harmonic generation
Physical Review A, 2010Co-Authors: Tianjiao Shao, Guangjiu Zhao, Bin Wen, Huan YangAbstract:In the present work, Laser-Parameter effects on the isolated attosecond pulse generation from two-color high-order harmonic generation (HHG) process are theoretically investigated by use of a wave-packet dynamics method. A 6-fs, 800-nm, $6\ifmmode\times\else\texttimes\fi{}{10}^{14}{\mathrm{W}/\mathrm{cm}}^{2}$, linearly polarized Laser pulse serves as the fundamental driving pulse and parallel linearly polarized control pulses at 400 nm (second harmonic) and 1600 nm (half harmonic) are superimposed to create a two-color field. Of the two techniques, we demonstrate that using a half-harmonic control pulse with a large relative strength and zero phase shift relative to the fundamental pulse is a more promising way to generate the shortest attosecond pulses. As a consequence, an isolated 12-as pulse is obtained by Fourier transforming an ultrabroad xuv continuum of 300 eV in the HHG spectrum under half-harmonic control scheme when the relative strength $\sqrt{R}=0.6$ and relative phase $=0$.
Wei Qiang Zhu - One of the best experts on this subject based on the ideXlab platform.
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generation of textured diamond abrasive tools by continuous wave co2 Laser Laser Parameter effects and optimisation
Journal of Materials Processing Technology, 2020Co-Authors: Ke Ge Xie, Wei Qiang ZhuAbstract:Abstract Textured Diamond Abrasive Tools (TDATs) have been attracted multitudes of attentions from both academic scholars and industrial engineers due to the reported superior grinding performances. However, the absence of appropriate fabrication technologies can still be considered as the bottleneck of wide applications of TDATs. To fill this gap, this paper utilised the continuous-wave CO2 Laser to produce passive-grinding structures on the diamond abrasive tool surfaces. Not only the theoretical analysis of the non-metallic multi-material ablation threshold for diamond abrasive tools, but also the experimental investigation of the effects of both the Laser power and the beam feed rate on both the topographies and morphologies of the produced structures were studied. The different structure generation mechanisms under different Laser Parameters were analyzed as well. Based on this, the strategy for selecting proper ablation Parameters was provided. Various examples of the produced textured wheels were given in the end to prove the study significance and feasibility. The presented work was expected helpful to provide a new method for industries to produce textured grinding wheels in an efficient and low-cost way.
Chaolin Tan - One of the best experts on this subject based on the ideXlab platform.
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Selective Laser melting of tungsten-copper functionally graded material
Materials Letters, 2019Co-Authors: Chaolin Tan, Kesong Zhou, Tongchun KuangAbstract:Abstract A tungsten-copper functionally graded material was processed based on SLM additive manufacture despite encountering some difficulties from materials characters. The effect of Laser Parameter on the interfacial defects and bonding performance are evaluated. The SLM produced tungsten is in columnar structures with random orientation. Plenty of fine tungsten grains are present at the bonding region, owing to a high cooling rate incited by the underlying copper. A metallurgically bonded interface with a 50–80 μm inter-diffusion region is formed. The interfacial bonding mechanism, which associates with intense Marangoni convection at the interface, is revealed and discussed.
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Interfacial characteristic and mechanical performance of maraging steel-copper functional bimetal produced by selective Laser melting based hybrid manufacture
Materials and Design, 2018Co-Authors: Chaolin Tan, Wenyou Ma, Kesong Zhou, Liu MinAbstract:A combination of selective Laser melting (SLM) additive manufacture and subtractive process was explored to produce maraging steel‑copper bimetal. Relationships among Laser Parameter, interfacial characteristic and mechanical performance are elucidated. A metallurgical bonded interface with a 30–40 μm inter-diffusion region is formed. Gradient submicro grains with strong 〈111〉 orientation exhibit at the interface, which owe to high cooling rate and temperature gradient caused by high thermal conductive copper. A selected region of the interface was extracted by focused ion beam (FIB) for interfacial bonding analysis. The bonding mechanism is revealed and illustrated in detail. Interfacial intense Marangoni flows pull the copper toward the molten pool of maraging steel and the liquid maraging steel penetrates into the melting copper, which contributes to interfacial bonding. The bonding strength of hybrid processed bimetals are evaluated. Fracture in tensile is not present at the interface but on the copper side. The highest flexural strength reaches 557 MPa, which is slightly higher than that of the copper. Effects of Parameter on fracture behaviors are also elucidated. This hybrid manufacture increases the productivity and functionality of the direct SLM-produced part, and provides a new approach for producing high-performance functional dissimilar bimetals based on Laser additive manufacture.
Milan R Amin - One of the best experts on this subject based on the ideXlab platform.
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quantification of benign lesion regression as a function of 532 nm pulsed potassium titanyl phosphate Laser Parameter selection
Laryngoscope, 2011Co-Authors: Pavan S Mallur, Bobby A Tajudeen, Nicole Aaronson, Ryan C Branski, Milan R AminAbstract:Objectives/Hypothesis: Although the potassium titanyl phosphate (KTP) Laser is versatile, the variability in Laser Parameters for laryngeal pathologies and the lack of clinical efficacy data remain problematic. We provide preliminary data regarding these Parameters for benign lesion regression. In addition, we describe a novel method for the quantification of the effects of the KTP Laser on vocal fold (VF) lesions. Study Design: Retrospective chart review. Methods: Images were captured from examinations before and after in-office KTP treatment in patients with a range of benign lesions. Laser settings were noted for each patient. Imaging software was then used to calculate a ratio of lesion area to VF length. Ten percent of images were requantified to determine inter-rater reliability. Results: Thirty-two patients underwent 47 procedures for lesions including hemorrhagic polyp, nonhemorrhagic polyp, vocal process granuloma, Reinke's edema, cyst/pseudocyst, leukoplakia, and squamous cell carcinoma in situ. No statistically significant differences were observed with regard to the Laser Parameters used as a function of lesion type. Regardless, by 1 month following treatment, all lesions had significantly decreased in size, except nonhemorrhagic polyps. Similar data were obtained at 2-month follow-up. We then compared the pre-KTP lesion size with the smallest lesion size quantified during the 1-year follow-up period. All lesions were significantly smaller, with the exception of Reinke's edema. Inter-rater reliability was quite good. Conclusions: KTP Laser effectively reduced VF lesion size, irrespective of the Laser Parameters used. In addition, our quantification method for lesion size appeared to be both viable and reliable.
Pavan S Mallur - One of the best experts on this subject based on the ideXlab platform.
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analysis of potassium titanyl phosphate Laser settings and voice outcomes in the treatment of reinke s edema
Annals of Otology Rhinology and Laryngology, 2015Co-Authors: Vyvy N Young, Pavan S Mallur, Adrienne Wong, Rajarsi Mandal, Giuseppe V Staltari, Jackie Gartnerschmidt, Clark A RosenAbstract:Objective:Despite increased clinical utility of the 532-nm potassium titanyl phosphate (KTP) Laser, no studies have examined outcomes for Reinke’s edema (RE) as a function of Laser Parameters and initial treatment effects. Variability in delivery Parameters, fiber-to-tissue distance, and immediate end-tissue effects limits universal application of existing study outcomes. We examine voice outcomes using standardized treatment classification, providing justification for Laser Parameter selection and immediate tissue effect in clinical use.Methods:Retrospective review of 9 patients who underwent KTP Laser treatment for RE. Demographics, RE severity, Laser settings, total Laser energy, and immediate tissue effects were correlated with quantified voice outcomes.Results:An average of 157 joules (6-640 J) was delivered over a 0.369-second exposure time (0.1-0.9 seconds). Immediate tissue effects varied from nonablative treatment (type I and type II) to ablation without tissue removal (type III). Overall, Voice ...
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quantification of benign lesion regression as a function of 532 nm pulsed potassium titanyl phosphate Laser Parameter selection
Laryngoscope, 2011Co-Authors: Pavan S Mallur, Bobby A Tajudeen, Nicole Aaronson, Ryan C Branski, Milan R AminAbstract:Objectives/Hypothesis: Although the potassium titanyl phosphate (KTP) Laser is versatile, the variability in Laser Parameters for laryngeal pathologies and the lack of clinical efficacy data remain problematic. We provide preliminary data regarding these Parameters for benign lesion regression. In addition, we describe a novel method for the quantification of the effects of the KTP Laser on vocal fold (VF) lesions. Study Design: Retrospective chart review. Methods: Images were captured from examinations before and after in-office KTP treatment in patients with a range of benign lesions. Laser settings were noted for each patient. Imaging software was then used to calculate a ratio of lesion area to VF length. Ten percent of images were requantified to determine inter-rater reliability. Results: Thirty-two patients underwent 47 procedures for lesions including hemorrhagic polyp, nonhemorrhagic polyp, vocal process granuloma, Reinke's edema, cyst/pseudocyst, leukoplakia, and squamous cell carcinoma in situ. No statistically significant differences were observed with regard to the Laser Parameters used as a function of lesion type. Regardless, by 1 month following treatment, all lesions had significantly decreased in size, except nonhemorrhagic polyps. Similar data were obtained at 2-month follow-up. We then compared the pre-KTP lesion size with the smallest lesion size quantified during the 1-year follow-up period. All lesions were significantly smaller, with the exception of Reinke's edema. Inter-rater reliability was quite good. Conclusions: KTP Laser effectively reduced VF lesion size, irrespective of the Laser Parameters used. In addition, our quantification method for lesion size appeared to be both viable and reliable.
