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International Conference on Laser and Laser Information Technologies最新文献

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Powder testing of novel organic materials for second harmonic generation 新型二次谐波产生有机材料的粉末测试
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563102
M. Zidan, M. K. Sabra, A. Allaham
{"title":"Powder testing of novel organic materials for second harmonic generation","authors":"M. Zidan, M. K. Sabra, A. Allaham","doi":"10.1117/12.563102","DOIUrl":"https://doi.org/10.1117/12.563102","url":null,"abstract":"We present preliminary results on the SHG properties of a number of organic materials in powder form using a Q-switched Nd-YAG laser (7 ns, λ=1064 nm) as the fundamental input. The organic powder was packed into sealed cells, which is set at an angle of 450 to the input beam. The intensity of reflected S.H. light (λ= 532 nm) was measured at an angle of 90° to the input beam. The urea was subjected to the same treatment, and used as a reference. Beside that we have calculated second-order hyperpolarizibilities (β) of the studied materials using PC-GAMESS package.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"02 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127333001","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}
引用次数: 0
Coherent population trapping resonance on degenerate two-level system for magnetic field measurement 简并二能级磁场测量系统的相干居群俘获共振
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563195
E. Alipieva, S. Gateva, E. Taskova
{"title":"Coherent population trapping resonance on degenerate two-level system for magnetic field measurement","authors":"E. Alipieva, S. Gateva, E. Taskova","doi":"10.1117/12.563195","DOIUrl":"https://doi.org/10.1117/12.563195","url":null,"abstract":"Coherent population trapping (CPT) resonances on the degenerate two-level system of the (Fg=2→Fe=1) transition of the 87Rb D1 line were investigated in an uncoated vacuum cell by means of level-crossing type experiments-sweeping a magnetic field around zero value and using a single laser beam. The two-photon resonance manifests itself as fluorescence canceling when the system of levels is degenerate (at zero point of magnetic field). The influence of weak transverse magnetic fields on the amplitude and width of the resonance was investigated. The CPT resonances were observed with linear, circular and elliptical polarized laser light. Transverse magnetic field widens the resonances obtained by linear and circular polarization but splits the resonance created by slightly elliptically polarized laser light. The dependence of this splitting on the elliptical ratio and experimental geometry were investigated. Due to its narrow width and sensitivity to low magnetic fields (< 1 G) this resonance is very promising for small magnetic field measurement.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127482519","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}
引用次数: 7
Ion-beam-modified surfaces as substrates for hydroxyapatite growth induced by laser-liquid-solid interaction 离子束修饰表面作为激光-液-固相互作用诱导羟基磷灰石生长的底物
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563091
L. Pramatarova, E. Pecheva, T. Petrov, N. Minkovski, A. Kondyurin, Radina Pramatarova
{"title":"Ion-beam-modified surfaces as substrates for hydroxyapatite growth induced by laser-liquid-solid interaction","authors":"L. Pramatarova, E. Pecheva, T. Petrov, N. Minkovski, A. Kondyurin, Radina Pramatarova","doi":"10.1117/12.563091","DOIUrl":"https://doi.org/10.1117/12.563091","url":null,"abstract":"In this study stainless steel, silicon and silica glass are used as representatives of metal, semiconductor and isolator with the purpose to create an experimental model for studying the formation of minerals like hydroxyapatite (HA, the bone and teeth mineral part) from aqueous solutions. The samples are Na+ implanted and consequently subjected to thermal treatment in air at 873 K. Implantation with Na+ is known to lead to formation of hydroxylated surface, i.e. formation of metal- or Si-OH- groups upon immersion in a liquid, simulating the human blood plasma (simulated body fluid, SBF). The negatively charged hydroxylated surfaces induce HA formation in SBF. The samples are immersed in SBF, irradiated through the solution with a scanning laser beam (CuBr pulsed laser equipped with a scanning system) and subsequently soaked in the solution at 37°C for a shorter time, comparing to the traditional methods for HA growing. The grown HA layers are investigated by Fourier Transform Infrared (FTIR) and Raman Spectroscopies, X-ray Diffraction (XRD), Light Microscopy (LM), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX) Spectroscopy to evaluate the effect of the surface modification by the thermal treatment following the ion implantation, as well as the effect of the laser irradiation on the process of HA formation.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122136051","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}
引用次数: 0
High-precision machining with copper bromide laser 溴化铜激光高精度加工
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563079
I. Balchev, N. Minkovski, Krassimir D. Dimitrov, N. Sabotinov
{"title":"High-precision machining with copper bromide laser","authors":"I. Balchev, N. Minkovski, Krassimir D. Dimitrov, N. Sabotinov","doi":"10.1117/12.563079","DOIUrl":"https://doi.org/10.1117/12.563079","url":null,"abstract":"It has been demonstrated that the Copper Bromide Laser is a promising tool in the micro-machining of several materials (Al, Cu, Brass, Si). These results were achieved with the combination of high average laser power, short pulses, visible radiation, high repetition rate and close to the diffraction-limited beam divergence. The heat-affected zone (HAZ) was relatively small and depends from the cutting speed and number of repetition.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122272801","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}
引用次数: 1
The measuring instrument of characteristics of laser radiation 激光辐射特性测量仪
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563123
A. Eskin, A. N. Kolerov, S. I. Krasnov
{"title":"The measuring instrument of characteristics of laser radiation","authors":"A. Eskin, A. N. Kolerov, S. I. Krasnov","doi":"10.1117/12.563123","DOIUrl":"https://doi.org/10.1117/12.563123","url":null,"abstract":"On the basis of thin-film anisotropic thermo converters was developed universal multifunctional compact measuring instrument of characteristics of high intensity laser radiation.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131819093","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}
引用次数: 0
Radiative lifetimes of Cd I and Cd II excited states Cd I和Cd II激发态的辐射寿命
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563205
Hongqi Xu, A. Persson, S. Svanberg, K. Blagoev, G. Malcheva, V. Pentchev, É. Biémont
{"title":"Radiative lifetimes of Cd I and Cd II excited states","authors":"Hongqi Xu, A. Persson, S. Svanberg, K. Blagoev, G. Malcheva, V. Pentchev, É. Biémont","doi":"10.1117/12.563205","DOIUrl":"https://doi.org/10.1117/12.563205","url":null,"abstract":"Radiative lifetimes of 1 1 levels in Cd I belonging to the 5s5p 1po1 and 5snd 3D1,2(n=6-9) and 5sns 3S1 (n=7,8) series, and of 5 levels of Cd II belonging to the 4d105p 2po1/2,3/2, 4d106s 2S1/2, and 4d105d 2D3/2,5/2 configurations were measured using the time-resolved laser-induced fluorescence technique. Free neutral and singly ionized cadmium were generated by laser ablation. Single- or two-step excitation processes were used to populate the levels under study. Transition probabilities and oscillator strengths for Cd I and Cd II transitions were also deduced by combining the experimental lifetimes and theoretical branching fractions obtained in multiconfigurational relativistic Hartree-Fock calculations, taking core-polarisation effects into account.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134365959","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}
引用次数: 0
Application of laser therapy in the surgical treatment of periodontal osseous defects with the Bio-Oss Spongiosa 激光治疗牙周骨缺损的临床应用
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563282
T. Uzunov, T. Uzunov, R. Grozdanova
{"title":"Application of laser therapy in the surgical treatment of periodontal osseous defects with the Bio-Oss Spongiosa","authors":"T. Uzunov, T. Uzunov, R. Grozdanova","doi":"10.1117/12.563282","DOIUrl":"https://doi.org/10.1117/12.563282","url":null,"abstract":"We have made an investigation on three-wall and four-wall osseous defects on which a surgical treatment was conducted with application of Bio-Oss ( Geistlich ) and laser therapy. After conducting of clinical oral hygiene to the patients and curettage with flap, a Bio-Oss Spongiosa of Geistlich is applied. We have conducted the laser therapy pre- and postoperative scanning with power density of 100 mW/cm2 on scheme. The patients were traced out within 1 year. The obtained results showed that the application of laser therapy gives anaesthetic, anti-inflammatory and regeneration stimulating effect.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"5449 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129948157","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}
引用次数: 0
Phase transformations induced in CdTe single crystal by ruby laser pulsed irradiation 红宝石激光脉冲辐照诱发CdTe单晶相变
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563082
G. Ivlev, E. Gatskevich, S. Zhvavyi, R. Černý, P. Přikryl, V. Cháb, O. Cibulka
{"title":"Phase transformations induced in CdTe single crystal by ruby laser pulsed irradiation","authors":"G. Ivlev, E. Gatskevich, S. Zhvavyi, R. Černý, P. Přikryl, V. Cháb, O. Cibulka","doi":"10.1117/12.563082","DOIUrl":"https://doi.org/10.1117/12.563082","url":null,"abstract":"Phase transitions induced by laser irradiation in CdTe wafers have been studied in situ and experimental and computer simulation methods. The samples were irradiated by ruby laser with pulse duration 80 ns in energy density range from 0.02 to 0.5 J/cm2. Time-resolved reflectivity (TRR) measurements were carried out at the wavelengths of λ1=1.064 μm and λ2=0.532 μm. Dynamics of transmissivity was studied at λ1. Photoluminescence of CdTe, excited by the ruby laser single pulse, was also investigated. The character of TRR transients changes with the increase of irradiation energy density. The changes are more considerable at λ1 than at λ2. The time dependencies of reflectivity are explained by the changes of optical parameters of CdTe in course of laser-induced melting, solidification and evaporation. The experimental data obtained from transmissivity and photoluminescence measurements correlate with those from TRR transients. Laser-induced melting, crystallization and evaporation processes were studied on the basis of the computational solution of a two-phase moving boundary problem with two moving interfaces. The calculated dependency of melt duration on energy density is in a reasonable agreement with experimental data. From our investigation it follows that in the molten state CdTe is characterized by constant or weakly changing reflectivity in the temperature range from Tm to 3000 K.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128007111","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}
引用次数: 7
A new laser tube construction for the UV Cu+ Ne-CuBr laser 一种新型紫外Cu+ ne - cur激光器激光管结构
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563098
N. Vuchkov, K. A. Temelkov, P. Zahariev, N. Sabotinov
{"title":"A new laser tube construction for the UV Cu+ Ne-CuBr laser","authors":"N. Vuchkov, K. A. Temelkov, P. Zahariev, N. Sabotinov","doi":"10.1117/12.563098","DOIUrl":"https://doi.org/10.1117/12.563098","url":null,"abstract":"An experimental study on a new laser tube construction for the UV Cu+ Ne-CuBr laser, conformable to our previous investigation on the reasons leading to a reduction of the tube lifetime, is reported. An optimization of the UV multilane average output power with respect to the discharge condition is presented. Laser tube lifetime up to 180 hours at an average laser power of about 700 mW is also reported.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125376538","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}
引用次数: 2
Influence of a parasitic magnetic field on the coherence resonances in a strong laser field 寄生磁场对强激光场中相干共振的影响
International Conference on Laser and Laser Information Technologies Pub Date : 2004-06-21 DOI: 10.1117/12.563208
Georgy C. Todorov, L. Petrov, D. Slavov, V. Polischuk, M. Chaika
{"title":"Influence of a parasitic magnetic field on the coherence resonances in a strong laser field","authors":"Georgy C. Todorov, L. Petrov, D. Slavov, V. Polischuk, M. Chaika","doi":"10.1117/12.563208","DOIUrl":"https://doi.org/10.1117/12.563208","url":null,"abstract":"Theoretical model describing the influence of a parasitic magnetic field on CPT-resonance in Hanle configuration in a strong laser field was proposed. The exact solution of the system of equations has been obtained for the transition between a ground state with Jφ=1 and an excited state with Jf=0 and/or 1. The solutions for the tensor components f k0, describing the population and longitudinal alignment of the upper level f, are obtained, and the dependences of the resonances on the different parameters and parasitic fields were analyzed. The results are in qualitative agreement with resent experimental investigations.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903926","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}
引用次数: 4
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