Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854047
V. N. Bykov, A. S. Viltchinsky, E. Prilepsky
A class of the apodizating pupil neccessary functions (PF)s which affords non-negativity of the point spread function (PSF) or the line-spread function (LSF) has been proposed previously, and we also examine a class of the PFs which affords non-negativity and monotonic decrease of the PSF or LSF on both sides of the maximum. Such a behavior of the PSF or LSF makes it possible to suppress oscillations in the image of the extended object edge, but it increases the shift and spreading of the image edge, because these phenomena are mutually complementary.
{"title":"Apodization in coherent image formation","authors":"V. N. Bykov, A. S. Viltchinsky, E. Prilepsky","doi":"10.1109/LFNM.2000.854047","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854047","url":null,"abstract":"A class of the apodizating pupil neccessary functions (PF)s which affords non-negativity of the point spread function (PSF) or the line-spread function (LSF) has been proposed previously, and we also examine a class of the PFs which affords non-negativity and monotonic decrease of the PSF or LSF on both sides of the maximum. Such a behavior of the PSF or LSF makes it possible to suppress oscillations in the image of the extended object edge, but it increases the shift and spreading of the image edge, because these phenomena are mutually complementary.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121484330","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854034
N.G. Nokody
Thermal meters are often used for measurement of optical radiation parameters. The investigation of the processes which act on the optical radiation of the receiver with the help of mathematical modeling allows one to increase the measurement precision, and to improve the space and time resolution and other parameters of the device. It is necessary to find the solution of the inverse heat problem (IHP) for this purpose, that is to reconstruct parameters of the heating the receiver of the radiation on the measured temperature. It is expedient to apply the mathematical modeling for debugging of the IHP solution algorithms. The radiation parameters are reconstructed. The algorithm parameters are optimized. Inverse heat problems can be divided into two groups. They are reconstructed data by the radiation intensity distribution in the space at fixed moment of the time in the first group and time dependence of the intensity on the fixed point in the second group. The methods of the solution of these problems are different.
{"title":"Mathematical modeling at development of the optical measuring devices","authors":"N.G. Nokody","doi":"10.1109/LFNM.2000.854034","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854034","url":null,"abstract":"Thermal meters are often used for measurement of optical radiation parameters. The investigation of the processes which act on the optical radiation of the receiver with the help of mathematical modeling allows one to increase the measurement precision, and to improve the space and time resolution and other parameters of the device. It is necessary to find the solution of the inverse heat problem (IHP) for this purpose, that is to reconstruct parameters of the heating the receiver of the radiation on the measured temperature. It is expedient to apply the mathematical modeling for debugging of the IHP solution algorithms. The radiation parameters are reconstructed. The algorithm parameters are optimized. Inverse heat problems can be divided into two groups. They are reconstructed data by the radiation intensity distribution in the space at fixed moment of the time in the first group and time dependence of the intensity on the fixed point in the second group. The methods of the solution of these problems are different.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123900208","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854056
M.Yu. Maslakov, A. Y. Kochetov, A. Zheleznyak
We have derived that the resulting speckle pattern has the highest possible contrast. The produced analytical estimation of the speckle pattern distribution description is reached at the assumption of the rectangular distributions of the used parameters. The purpose of the given work is to develop a technique of the detection of heterogeneity in a structure of the surface microrelief, using an analysis of a speckle pattern formed by this surface.
{"title":"Correlation analysis of speckle pattern of inhomogeneous microrelief","authors":"M.Yu. Maslakov, A. Y. Kochetov, A. Zheleznyak","doi":"10.1109/LFNM.2000.854056","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854056","url":null,"abstract":"We have derived that the resulting speckle pattern has the highest possible contrast. The produced analytical estimation of the speckle pattern distribution description is reached at the assumption of the rectangular distributions of the used parameters. The purpose of the given work is to develop a technique of the detection of heterogeneity in a structure of the surface microrelief, using an analysis of a speckle pattern formed by this surface.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125476387","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854033
A. Katrich, A. A. Katrich, I. Priz
In commercial applications the laser beam is a product and then it has to be characterized by the set of the parameters to be compared and to be used. These parameters are standardized and ISO-standards are the basis for the developing of national ones. The discussion at the 5th International Workshop for the Laser Beam and Optics Characterization (LBOC5, Erice, Italy, 20-25.03.2000) has shown that inorder to satisfy demands of the users and developers of the lasers a lot of the methods and definitions have to be modified. At first it was concerned with the beam diagnostics of the novel laser devices: ultra-short-pulsed, DUV/VUV lasers for lithography and diode lasers for communications and industry. To solve these problems the new EUREKA project CHOCLABII (EU 2359) will start in 2000 to organize the cooperation with many research facilities in more, than 12 countries.
{"title":"Laser beam characterization","authors":"A. Katrich, A. A. Katrich, I. Priz","doi":"10.1109/LFNM.2000.854033","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854033","url":null,"abstract":"In commercial applications the laser beam is a product and then it has to be characterized by the set of the parameters to be compared and to be used. These parameters are standardized and ISO-standards are the basis for the developing of national ones. The discussion at the 5th International Workshop for the Laser Beam and Optics Characterization (LBOC5, Erice, Italy, 20-25.03.2000) has shown that inorder to satisfy demands of the users and developers of the lasers a lot of the methods and definitions have to be modified. At first it was concerned with the beam diagnostics of the novel laser devices: ultra-short-pulsed, DUV/VUV lasers for lithography and diode lasers for communications and industry. To solve these problems the new EUREKA project CHOCLABII (EU 2359) will start in 2000 to organize the cooperation with many research facilities in more, than 12 countries.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125186822","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854025
V. Kononenko
The modeling simulation of the asymmetric MQW heterostructure laser performance allows one to chose the active region parameters for required regimes of the operation, such as bistable switching and regular pulsation at several remote wavelengths. In accordance with the structure design and pump conditions, both the spectral and output power characteristics of these laser systems can be easily changed. Use of the asymetric MQW heterostructures gives new opportunities to extend gain spectra and is essential to weaken its sensitivity to polarization.
{"title":"Asymmetric multiple-quantum-well heterostructures: conception, properties, and laser characteristics","authors":"V. Kononenko","doi":"10.1109/LFNM.2000.854025","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854025","url":null,"abstract":"The modeling simulation of the asymmetric MQW heterostructure laser performance allows one to chose the active region parameters for required regimes of the operation, such as bistable switching and regular pulsation at several remote wavelengths. In accordance with the structure design and pump conditions, both the spectral and output power characteristics of these laser systems can be easily changed. Use of the asymetric MQW heterostructures gives new opportunities to extend gain spectra and is essential to weaken its sensitivity to polarization.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128311236","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854041
Y. Machekhin, A.I. Raschektaeva
The high requirements in measuring accuracy of telecommunication spectral range working equipment demand a new approach to metrological maintenance of low intensity laser photometry. Recently this spectral range has not been studied in photometry. Therefore, the creation of a high-precision means for measurements and the development of methods for checking and calibrating devices become a primary problem, which is necessary to solve in Ukraine in the near future for the field of metrological maintenance. The second problem in formation of metrological maintenance is that it is necessary to create methods close to the international requirements and standards.
{"title":"Basic problems of metrology maintenance optical testers and wattmeters","authors":"Y. Machekhin, A.I. Raschektaeva","doi":"10.1109/LFNM.2000.854041","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854041","url":null,"abstract":"The high requirements in measuring accuracy of telecommunication spectral range working equipment demand a new approach to metrological maintenance of low intensity laser photometry. Recently this spectral range has not been studied in photometry. Therefore, the creation of a high-precision means for measurements and the development of methods for checking and calibrating devices become a primary problem, which is necessary to solve in Ukraine in the near future for the field of metrological maintenance. The second problem in formation of metrological maintenance is that it is necessary to create methods close to the international requirements and standards.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116175985","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854035
S. Savenkov, K.E. Yushtin
The new classes of polarisation behaviour of objects have been obtained taking into consideration isotropic depolarisation. The output randomness (value of the square intensity of the depolarised component) it has been used as quantitative value to characterise the depolarisation properties of a studied object.
{"title":"New classes of objects in polarimetry: including the isotropic depolarisation","authors":"S. Savenkov, K.E. Yushtin","doi":"10.1109/LFNM.2000.854035","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854035","url":null,"abstract":"The new classes of polarisation behaviour of objects have been obtained taking into consideration isotropic depolarisation. The output randomness (value of the square intensity of the depolarised component) it has been used as quantitative value to characterise the depolarisation properties of a studied object.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125826435","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854055
L.A. Ageev, V.K. Miloslavsky, E. Larionova
A new method of preparation of holographic gratings based on the usage of the one laser beam is proposed. The beam was incident on the photosensitive thin film deposited on the ZnS crystal surface. The ZnS crystals have a defective structure and consist of alternating regions of the hexagonal and cubical modifications that are thin interlayers, perpendicular to the boundaries of a plate.
{"title":"Holographic gratings in photosensitive film on surface of crystal ZnS substrate","authors":"L.A. Ageev, V.K. Miloslavsky, E. Larionova","doi":"10.1109/LFNM.2000.854055","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854055","url":null,"abstract":"A new method of preparation of holographic gratings based on the usage of the one laser beam is proposed. The beam was incident on the photosensitive thin film deposited on the ZnS crystal surface. The ZnS crystals have a defective structure and consist of alternating regions of the hexagonal and cubical modifications that are thin interlayers, perpendicular to the boundaries of a plate.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124253916","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854057
I. Svir, A. Oleinick, Richard G. Compton
We show the application of the three layer finite implicit (3LFI) method for finding a solution of the ECL diffusion microsphere problem during bipolar impulse non-stationary electrolysis. Two different transformed coordinates in the radial coordinate were employed, a conformal map and an exponentially expanding grid, with aim of optimising the modelling of the diffusion under non steady state conditions.
{"title":"Optimisation of simulation of diffusional transport to microsphere electrode and its application to electrogenerated chemiluminescence","authors":"I. Svir, A. Oleinick, Richard G. Compton","doi":"10.1109/LFNM.2000.854057","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854057","url":null,"abstract":"We show the application of the three layer finite implicit (3LFI) method for finding a solution of the ECL diffusion microsphere problem during bipolar impulse non-stationary electrolysis. Two different transformed coordinates in the radial coordinate were employed, a conformal map and an exponentially expanding grid, with aim of optimising the modelling of the diffusion under non steady state conditions.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116513247","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}
Pub Date : 2000-05-23DOI: 10.1109/LFNM.2000.854058
I. Svir, A. Klimenko, R. Compton
The convection-diffusion kinetics at the channel electrode may be successfully simulated using the alternating direction implicit (ADI) method. We used an irregular grid in all co-ordinates (x, y and t) inorder to obtain efficient results near the electrode surface and at the start of the electrolysis. Calculated currents for each approach (irregular and uniform grid) were compared to using limited current.
{"title":"Alternating direction implicit method, ADI: efficient and stable approach to electrochemical modelling. Simulation of channel flow cell problem","authors":"I. Svir, A. Klimenko, R. Compton","doi":"10.1109/LFNM.2000.854058","DOIUrl":"https://doi.org/10.1109/LFNM.2000.854058","url":null,"abstract":"The convection-diffusion kinetics at the channel electrode may be successfully simulated using the alternating direction implicit (ADI) method. We used an irregular grid in all co-ordinates (x, y and t) inorder to obtain efficient results near the electrode surface and at the start of the electrolysis. Calculated currents for each approach (irregular and uniform grid) were compared to using limited current.","PeriodicalId":265943,"journal":{"name":"Proceedings of LFNM'2000. 2nd International Workshop on Laser and Fiber-Optical Networks Modeling (Cat. No.00EX419)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132430304","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}
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