Pub Date : 1998-05-01DOI: 10.1088/0963-9659/7/3/002
S. Riehemann
For practical applications, Denisyuk type holograms offer important advantages. So this recording geometry is utilized to develop a compact holographic double-exposure interferometer based on a photorefractive SBN:Ce crystal as storage material. A preliminary report on the realized interferometer is given, present limitations are determined and proposals for further improvements are outlined.
{"title":"Double-exposure interferometry utilizing Denisyuk holograms in photorefractive crystals","authors":"S. Riehemann","doi":"10.1088/0963-9659/7/3/002","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/002","url":null,"abstract":"For practical applications, Denisyuk type holograms offer important advantages. So this recording geometry is utilized to develop a compact holographic double-exposure interferometer based on a photorefractive SBN:Ce crystal as storage material. A preliminary report on the realized interferometer is given, present limitations are determined and proposals for further improvements are outlined.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83162355","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/004
O. Angelsky, A. V. Konovchuk, P. Polyanskii
Fourier transform and imaging properties of referenceless fractalograms are studied for the example of an aperture bounded by a Koch curve. Peculiarities of the images reconstructed from such fractalograms are investigated proceeding from Young's interpretation of diffraction phenomena. A registration zone of the comprehensive informativity of a referenceless fractalogram is determined, and a multi-stage procedure for pre-processing of a fractal-containing optical signal is briefly outlined.
{"title":"REPRODUCTION PROPERTIES OF REFERENCELESS FRACTALOGRAMS","authors":"O. Angelsky, A. V. Konovchuk, P. Polyanskii","doi":"10.1088/0963-9659/7/3/004","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/004","url":null,"abstract":"Fourier transform and imaging properties of referenceless fractalograms are studied for the example of an aperture bounded by a Koch curve. Peculiarities of the images reconstructed from such fractalograms are investigated proceeding from Young's interpretation of diffraction phenomena. A registration zone of the comprehensive informativity of a referenceless fractalogram is determined, and a multi-stage procedure for pre-processing of a fractal-containing optical signal is briefly outlined.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77662442","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/012
J. Nunzi, F. Charra
Phase-conjugation experiments have been performed in a backward degenerate four-wave mixing geometry using 1064 nm picosecond light pulses in thick p-toluene sulphonate polydiacetylene crystals. Two-photon absorption is identified and characterized. The relevant propagation equations are resolved analytically in different experimental geometries. Nonlinear absorption cancels out all the phase-conjugate signal at light fluences. A time-dependent analysis of the effect in a pump and nonlinear-probe experiment reveals an excited-state-induced nonlinearity.
{"title":"PHASE CONJUGATION UNDER TWO-PHOTON ABSORPTION CONDITIONS IN POLYDIACETYLENE CRYSTALS","authors":"J. Nunzi, F. Charra","doi":"10.1088/0963-9659/7/3/012","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/012","url":null,"abstract":"Phase-conjugation experiments have been performed in a backward degenerate four-wave mixing geometry using 1064 nm picosecond light pulses in thick p-toluene sulphonate polydiacetylene crystals. Two-photon absorption is identified and characterized. The relevant propagation equations are resolved analytically in different experimental geometries. Nonlinear absorption cancels out all the phase-conjugate signal at light fluences. A time-dependent analysis of the effect in a pump and nonlinear-probe experiment reveals an excited-state-induced nonlinearity.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90678235","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/021
A. Lakhtakia, W. Weiglhofer
{"title":"Remarks on `The electromagnetic field in a uniformly moving crystal'","authors":"A. Lakhtakia, W. Weiglhofer","doi":"10.1088/0963-9659/7/3/021","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/021","url":null,"abstract":"","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85949030","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/003
Shyam Singh, A. Dube, P. Gupta
Effects of UVA on the growth of maize ( Zea mays L.) plants were investigated by growing them under two different controlled conditions. The weight of plants, length of stem, and length and width of the second leaf of each plant were measured. It was found that the growth of plants was reduced under UVA treatment at an early stage. We observed a clear-cut reduction in the growth of plants. The fluorescence spectra of green maize leaf induced by 337 nm radiation were obtained in each case, consisting of four peak bands at 435 nm (F435), 525 nm (F525), 684 nm (F684) and 740 nm (F740), respectively. The ratios of blue to green bands (F435/F525), blue to red bands (F435/F684) and the chlorophyll fluorescence (F684/F740) ratio were calculated and discussed.
{"title":"Fluorescence study of maize irradiated by UVA","authors":"Shyam Singh, A. Dube, P. Gupta","doi":"10.1088/0963-9659/7/3/003","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/003","url":null,"abstract":"Effects of UVA on the growth of maize ( Zea mays L.) plants were investigated by growing them under two different controlled conditions. The weight of plants, length of stem, and length and width of the second leaf of each plant were measured. It was found that the growth of plants was reduced under UVA treatment at an early stage. We observed a clear-cut reduction in the growth of plants. The fluorescence spectra of green maize leaf induced by 337 nm radiation were obtained in each case, consisting of four peak bands at 435 nm (F435), 525 nm (F525), 684 nm (F684) and 740 nm (F740), respectively. The ratios of blue to green bands (F435/F525), blue to red bands (F435/F684) and the chlorophyll fluorescence (F684/F740) ratio were calculated and discussed.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82666388","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/010
A. P. Napartovich, D. V. Vysotsky
Recently, a number of publications have considered resonators with complicated mirror surfaces and/or reflectivity aiming at high discrimination against higher-order modes and low loss for the fundamental mode. In this paper, an analytical approach is developed to study resonators for producing Gaussian-shaped beams both for the stripe and circular geometry. Explicit expressions are obtained for the fundamental mode loss and modal discrimination by assuming a Gaussian-shaped reflectivity for the output plane mirror.
{"title":"ANALYTICAL STUDIES ON RESONATOR CONSTRUCTION FOR PRODUCING GAUSSIAN BEAMS","authors":"A. P. Napartovich, D. V. Vysotsky","doi":"10.1088/0963-9659/7/3/010","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/010","url":null,"abstract":"Recently, a number of publications have considered resonators with complicated mirror surfaces and/or reflectivity aiming at high discrimination against higher-order modes and low loss for the fundamental mode. In this paper, an analytical approach is developed to study resonators for producing Gaussian-shaped beams both for the stripe and circular geometry. Explicit expressions are obtained for the fundamental mode loss and modal discrimination by assuming a Gaussian-shaped reflectivity for the output plane mirror.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88816970","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/011
H. Nistazakis, D. Frantzeskakis, K. Hizanidis
A spectral method is used to investigate nonlinear wave propagation in optical fibres near the zero-dispersion point. The conditions for solitary (bright and dark) or periodic wave generation and propagation without any distortion, as well as the form of the waves, are obtained. It is demonstrated that bright solitary pulses may propagate near the second zero-dispersion point in quadruple-clad fibres, while neither periodic nor solitary wave propagation is practically possible near the sole zero-dispersion point in graded-index fibres, or near the first one in quadruple-clad fibres.
{"title":"On the formation of solitary and periodic waves in optical fibres near the zero-dispersion point","authors":"H. Nistazakis, D. Frantzeskakis, K. Hizanidis","doi":"10.1088/0963-9659/7/3/011","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/011","url":null,"abstract":"A spectral method is used to investigate nonlinear wave propagation in optical fibres near the zero-dispersion point. The conditions for solitary (bright and dark) or periodic wave generation and propagation without any distortion, as well as the form of the waves, are obtained. It is demonstrated that bright solitary pulses may propagate near the second zero-dispersion point in quadruple-clad fibres, while neither periodic nor solitary wave propagation is practically possible near the sole zero-dispersion point in graded-index fibres, or near the first one in quadruple-clad fibres.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78370060","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/001
P. Kerkoc, R. Bailey, F. Cruickshank, D. Pugh
The theory necessary for the optimization of second-harmonic (SHG) efficiency in biaxial crystals is developed and applied to the molecular crystal (-)2--(methylbenzylamino)-5-nitropyridine (MBANP). It is shown that, for the range of crystal lengths and beam walk-off angles available, the criteria for the selection of the parameters and for optimization of the second-harmonic signal are the same in biaxial and uniaxial crystals. The maximal possible SHG figure of merit, , is found to be for a 50 mm long crystal.
{"title":"LETTER TO THE EDITOR: Second-harmonic generation in biaxial crystals for a non-depleted fundamental Gaussian laser beam","authors":"P. Kerkoc, R. Bailey, F. Cruickshank, D. Pugh","doi":"10.1088/0963-9659/7/3/001","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/001","url":null,"abstract":"The theory necessary for the optimization of second-harmonic (SHG) efficiency in biaxial crystals is developed and applied to the molecular crystal (-)2--(methylbenzylamino)-5-nitropyridine (MBANP). It is shown that, for the range of crystal lengths and beam walk-off angles available, the criteria for the selection of the parameters and for optimization of the second-harmonic signal are the same in biaxial and uniaxial crystals. The maximal possible SHG figure of merit, , is found to be for a 50 mm long crystal.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75583931","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/019
D. Jiang, J. Stamnes
We compare theoretical and experimental results for focusing of two-dimensional electromagnetic waves through a plane interface. In general, good agreement is found when account is taken of possible aberrations. However, when the relative refractive index between the two media becomes large, discrepancies are observed due to reflections from the back surface of the second medium.
{"title":"Theoretical and experimental results for two-dimensional electromagnetic waves focused through an interface","authors":"D. Jiang, J. Stamnes","doi":"10.1088/0963-9659/7/3/019","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/019","url":null,"abstract":"We compare theoretical and experimental results for focusing of two-dimensional electromagnetic waves through a plane interface. In general, good agreement is found when account is taken of possible aberrations. However, when the relative refractive index between the two media becomes large, discrepancies are observed due to reflections from the back surface of the second medium.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86107293","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 : 1998-05-01DOI: 10.1088/0963-9659/7/3/008
J. Kastelik, M. Pommeray, A. Kab, M. Gazalet
Multifrequency acousto-optic interaction is limited mainly by the two-tone, third-order intermodulation products. The tangential phase-matching (TPM) anisotropic interaction can greatly reduce the phase-grating intermodulations. We consider the two operating modes, high or low frequency, for the slow shear wave propagating in paratellurite with an angular tilt from the [110] axis. As two different angles lead to the same central operating frequency, we show that the low-frequency configuration allows one to greatly increase the dynamic range, compared with that obtained in the high-frequency mode. For experimental validation, two bifrequency acousto-optic modulators have been realized and tested. For a central frequency in the low-frequency configuration and a diffraction efficiency , the dynamic range is shown to be enhanced by 5 dB.
{"title":"High dynamic range, bifrequency acousto-optic modulator","authors":"J. Kastelik, M. Pommeray, A. Kab, M. Gazalet","doi":"10.1088/0963-9659/7/3/008","DOIUrl":"https://doi.org/10.1088/0963-9659/7/3/008","url":null,"abstract":"Multifrequency acousto-optic interaction is limited mainly by the two-tone, third-order intermodulation products. The tangential phase-matching (TPM) anisotropic interaction can greatly reduce the phase-grating intermodulations. We consider the two operating modes, high or low frequency, for the slow shear wave propagating in paratellurite with an angular tilt from the [110] axis. As two different angles lead to the same central operating frequency, we show that the low-frequency configuration allows one to greatly increase the dynamic range, compared with that obtained in the high-frequency mode. For experimental validation, two bifrequency acousto-optic modulators have been realized and tested. For a central frequency in the low-frequency configuration and a diffraction efficiency , the dynamic range is shown to be enhanced by 5 dB.","PeriodicalId":20787,"journal":{"name":"Pure and Applied Optics: Journal of The European Optical Society Part A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86126691","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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