G. Ostrovskaya, A. Frank, S. Bogdanov, G. Dreiden, V. Markov
Results are presented of holographic investigations of current sheets formed in 3D magnetic fields with X lines. The experimental plasma device, optical scheme of holographic interferograms recording and interpretation are considered. The influence of the guide field Bz on the dynamics and structure of the current sheets was investigated. Asymmetry and tilting the current sheets formed in the plasmas of heavy noble gases were observed and interpreted as a manifestation of two-fluid properties of plasmas with heavy ions.
{"title":"Holographic investigations of current sheets plasma dynamics in 3D magnetic fields with X lines","authors":"G. Ostrovskaya, A. Frank, S. Bogdanov, G. Dreiden, V. Markov","doi":"10.1117/12.677294","DOIUrl":"https://doi.org/10.1117/12.677294","url":null,"abstract":"Results are presented of holographic investigations of current sheets formed in 3D magnetic fields with X lines. The experimental plasma device, optical scheme of holographic interferograms recording and interpretation are considered. The influence of the guide field Bz on the dynamics and structure of the current sheets was investigated. Asymmetry and tilting the current sheets formed in the plasmas of heavy noble gases were observed and interpreted as a manifestation of two-fluid properties of plasmas with heavy ions.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122583472","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}
I. Mancheva, T. Petrova, Violeta Dragostinova, L. Nikolova
The photoinduced processes in four methacrylic azobenzene-containing copolymers have been investigated. The materials have been synthesized by radical type polymerization of the chromophore monomer and methylmethacrylate. The copolymers differ only in the concentration of chromophore monomers (P1 - 5mol%, P2 - 23mol%, P3 - 5Omol% and P4 - 100mol%). The first three polymers are amorphous and the fourth (P4) is liquid-crystalline. We have established that the photoequilibrium concentration of cis-azobenzenes obtained on irradiation with nonpolarized UV light and with a linearly polarized Ar beam decreases with increasing concentration of chromophore monomers: it is highest for polymer P1 and lowest for P4. Similarly, values for the observed dichroism induced by polarized light can be linked to chromophore concentration. But here lower values of the concentration of chromophores correspond to lower values for photodichroism. This, however, does not hold for the P4 polymer and this is most probably caused by its liquid-crystalline properties.
{"title":"Spectrophotometric investigation of photoinduced processes in methacrylic azobenzene-containing polymers","authors":"I. Mancheva, T. Petrova, Violeta Dragostinova, L. Nikolova","doi":"10.1117/12.676859","DOIUrl":"https://doi.org/10.1117/12.676859","url":null,"abstract":"The photoinduced processes in four methacrylic azobenzene-containing copolymers have been investigated. The materials have been synthesized by radical type polymerization of the chromophore monomer and methylmethacrylate. The copolymers differ only in the concentration of chromophore monomers (P1 - 5mol%, P2 - 23mol%, P3 - 5Omol% and P4 - 100mol%). The first three polymers are amorphous and the fourth (P4) is liquid-crystalline. We have established that the photoequilibrium concentration of cis-azobenzenes obtained on irradiation with nonpolarized UV light and with a linearly polarized Ar beam decreases with increasing concentration of chromophore monomers: it is highest for polymer P1 and lowest for P4. Similarly, values for the observed dichroism induced by polarized light can be linked to chromophore concentration. But here lower values of the concentration of chromophores correspond to lower values for photodichroism. This, however, does not hold for the P4 polymer and this is most probably caused by its liquid-crystalline properties.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122725758","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}
Digital holography has been around for over thirty years; however only in recent years has necessary and affordable recording and computing hardware become widely available. Some of the first works in digital holography are described as far back as 1966, with others following shortly after that. Today many researchers are working in this area for both application and further development of the technique. Indeed, digital holography may represent the best hope for holography as a thriving area of optics, and science. In this paper we discuss of the many applications, advantages, challenges, and opportunities that exist in the field of digital holography.
{"title":"Applications, challenges, and approaches for electronic, digital holography","authors":"J. Trolinger, V. Markov, A. Khizhnyak","doi":"10.1117/12.677050","DOIUrl":"https://doi.org/10.1117/12.677050","url":null,"abstract":"Digital holography has been around for over thirty years; however only in recent years has necessary and affordable recording and computing hardware become widely available. Some of the first works in digital holography are described as far back as 1966, with others following shortly after that. Today many researchers are working in this area for both application and further development of the technique. Indeed, digital holography may represent the best hope for holography as a thriving area of optics, and science. In this paper we discuss of the many applications, advantages, challenges, and opportunities that exist in the field of digital holography.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125223798","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}
F. Charriére, F. Montfort, E. Cuche, C. Depeursinge
In digital holographic microscopy, shot noise is an intrinsic part of the recording process with a digital camera. We present a study based on simulations describing how shot noise influences the quality of the reconstructed phase images under different beams intensities configurations. A model for image quality estimation based on the decision statistical theory proposed by Wagner and Brown (R.F. Wagner and D.G. Brown, "Unified SNR Analysis of Medical Imaging-Systems," Phys. Med. Biol. 30, 489-518 (1985)) will be presented. A simulation will depict the variations of the reconstructed phase images SNR for different distributions of the total intensity between the reference and the object beam.
{"title":"Shot noise perturbations in digital holographic microscopy phase images","authors":"F. Charriére, F. Montfort, E. Cuche, C. Depeursinge","doi":"10.1117/12.677157","DOIUrl":"https://doi.org/10.1117/12.677157","url":null,"abstract":"In digital holographic microscopy, shot noise is an intrinsic part of the recording process with a digital camera. We present a study based on simulations describing how shot noise influences the quality of the reconstructed phase images under different beams intensities configurations. A model for image quality estimation based on the decision statistical theory proposed by Wagner and Brown (R.F. Wagner and D.G. Brown, \"Unified SNR Analysis of Medical Imaging-Systems,\" Phys. Med. Biol. 30, 489-518 (1985)) will be presented. A simulation will depict the variations of the reconstructed phase images SNR for different distributions of the total intensity between the reference and the object beam.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126322062","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}
F. Ujhelyi, M. Lovasz, Z. Göröcs, A. Sütő, P. Koppa, G. Erdei, E. Lőrincz
We present non-volatile readout of thin film polarization Fourier holograms using different wavelengths. We demonstrate application of imaged reference phase coding in portable holographic demonstrator. Experimental results approve applicability of preliminary computer simulations.
{"title":"Phase coded polarization holographic system demonstration","authors":"F. Ujhelyi, M. Lovasz, Z. Göröcs, A. Sütő, P. Koppa, G. Erdei, E. Lőrincz","doi":"10.1117/12.677028","DOIUrl":"https://doi.org/10.1117/12.677028","url":null,"abstract":"We present non-volatile readout of thin film polarization Fourier holograms using different wavelengths. We demonstrate application of imaged reference phase coding in portable holographic demonstrator. Experimental results approve applicability of preliminary computer simulations.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127255638","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}
J. Pielichowski, D. Bogdał, M. Bednarz, F. Kajzar, Jacek Nozioł, P. Armatys
Synthesis of diazocarbazole dyes is described together with their photoisomerizaton properties that were demonstrated under strong illumination with a laser beam. It was shown that the dyes could be used as precursors to synthesis of carbazole based polymers suitable for applications in photonics.
{"title":"Synthesis and properties of some diazocarbazole derivative dyes as novel photorefractive materials","authors":"J. Pielichowski, D. Bogdał, M. Bednarz, F. Kajzar, Jacek Nozioł, P. Armatys","doi":"10.1117/12.676749","DOIUrl":"https://doi.org/10.1117/12.676749","url":null,"abstract":"Synthesis of diazocarbazole dyes is described together with their photoisomerizaton properties that were demonstrated under strong illumination with a laser beam. It was shown that the dyes could be used as precursors to synthesis of carbazole based polymers suitable for applications in photonics.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133538237","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}
Experimental investigation and modeling of angular and spectral selectivity of volume transmission and reflection holograms in PVA/acrylamide photopolymer has been carried out. Influence of non-uniform light absorption, shrinkage of material thickness, changing of the average refractive index and refractive index modulation through the hologram thickness, and bending of interference fringes are taken into account.
{"title":"Selectivity properties of non-uniform volume holograms in photopolymer materials","authors":"E. Pen, M. Rodionov, V. Shelkovnikov","doi":"10.1117/12.676530","DOIUrl":"https://doi.org/10.1117/12.676530","url":null,"abstract":"Experimental investigation and modeling of angular and spectral selectivity of volume transmission and reflection holograms in PVA/acrylamide photopolymer has been carried out. Influence of non-uniform light absorption, shrinkage of material thickness, changing of the average refractive index and refractive index modulation through the hologram thickness, and bending of interference fringes are taken into account.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130243433","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}
Digital holography is a symbiosis of physical optics and digital computers. In numerical reconstruction of optical holograms, optical wavefront is sampled, and obtained numerical data are transformed in computers for evaluating physical properties of objects that produced that wave front. In fabricating computer-generated holograms, numerical data produced by a computer are converted into a physical hologram or an optical element intended for forming real optical beams. Therefore mutual correspondence between optical transformations and their computer representations is of fundamental importance for digital holography. In the paper, this problem is addressed and different computer representations of basic optical transforms such as convolution, Fourier and Fresnel integral transforms are briefly reviewed.
{"title":"Optical transforms in digital holography","authors":"L. Yaroslavsky","doi":"10.1117/12.677048","DOIUrl":"https://doi.org/10.1117/12.677048","url":null,"abstract":"Digital holography is a symbiosis of physical optics and digital computers. In numerical reconstruction of optical holograms, optical wavefront is sampled, and obtained numerical data are transformed in computers for evaluating physical properties of objects that produced that wave front. In fabricating computer-generated holograms, numerical data produced by a computer are converted into a physical hologram or an optical element intended for forming real optical beams. Therefore mutual correspondence between optical transformations and their computer representations is of fundamental importance for digital holography. In the paper, this problem is addressed and different computer representations of basic optical transforms such as convolution, Fourier and Fresnel integral transforms are briefly reviewed.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131803243","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}
In this paper, we present an overview of some recent advances in interpolation and resampling. We are particularly interested in the linear, convolution-based interpolation techniques where new image pixels are generated by first fitting a certain continuous function to the given uniformly sampled data and then resampled at the desired coordinates. We start with stating the interpolation problem in signal and frequeny domain and then continue with describing the interpolation artifacts and how to evaluate the interpolator's performance. We then review the class of piecewise-polynomial interpolators of minimal support as the best compromise between high performance and acceptable cost. We describe efficient filter structures, discuss different optimized designs and give comparative results both experimental and analytical.
{"title":"Interpolation and resampling in image processing and holography","authors":"A. Gotchev, K. Egiazarian","doi":"10.1117/12.677053","DOIUrl":"https://doi.org/10.1117/12.677053","url":null,"abstract":"In this paper, we present an overview of some recent advances in interpolation and resampling. We are particularly interested in the linear, convolution-based interpolation techniques where new image pixels are generated by first fitting a certain continuous function to the given uniformly sampled data and then resampled at the desired coordinates. We start with stating the interpolation problem in signal and frequeny domain and then continue with describing the interpolation artifacts and how to evaluate the interpolator's performance. We then review the class of piecewise-polynomial interpolators of minimal support as the best compromise between high performance and acceptable cost. We describe efficient filter structures, discuss different optimized designs and give comparative results both experimental and analytical.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134033285","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}
The schemes for nonlinear recording of dynamic holograms in multilevel resonant media, in conditions when the fifth- and higher-order nonlinearities are exhibited, have been studied both theoretically and experimentally. The optical methods to control the diffraction efficiency of nonlinear dynamic holograms with the use of an additional light beam tuned out into the absorption band from the ground or excited state of the molecules have been considered.
{"title":"Nonlinear hologram recording in resonant media and optical control of diffraction efficiency","authors":"A. Tolstik, O. Ormachea","doi":"10.1117/12.677300","DOIUrl":"https://doi.org/10.1117/12.677300","url":null,"abstract":"The schemes for nonlinear recording of dynamic holograms in multilevel resonant media, in conditions when the fifth- and higher-order nonlinearities are exhibited, have been studied both theoretically and experimentally. The optical methods to control the diffraction efficiency of nonlinear dynamic holograms with the use of an additional light beam tuned out into the absorption band from the ground or excited state of the molecules have been considered.","PeriodicalId":266048,"journal":{"name":"International Conference on Holography, Optical Recording, and Processing of Information","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123646216","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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