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Topical Meeting on Photorefractive Materials, Effects, and Devices II最新文献

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Influence of the Excited State of Fe2+ on Photorefractive Effect in InP Fe2+激发态对InP光折变效应的影响
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.pd11
P. Delaye, P. Halter, G. Roosen
{"title":"Influence of the Excited State of Fe2+ on Photorefractive Effect in InP","authors":"P. Delaye, P. Halter, G. Roosen","doi":"10.1364/pmed.1990.pd11","DOIUrl":"https://doi.org/10.1364/pmed.1990.pd11","url":null,"abstract":"Although the excited state of Fe2+ is well known in InP:Fe (figure 1), its influence on photorefractive effect has never been taken into account. We report here a study of this influence and show that the presence of this state induces in the photorefractive effect a new hole-electron competition. This theory well explains the photorefractive coupling gain results obtained on a crystal without any classical hole-electron competition(αn«αp).","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124340920","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
Photovoltaic gratings recorded in Praeseodymium doped La3Ga5SiO14 crystals 在掺镨La3Ga5SiO14晶体中记录的光伏光栅
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.fp1
G. Pauliat, A. Slensky, V. Fridkin, G. Roosen
{"title":"Photovoltaic gratings recorded in Praeseodymium doped La3Ga5SiO14 crystals","authors":"G. Pauliat, A. Slensky, V. Fridkin, G. Roosen","doi":"10.1364/pmed.1990.fp1","DOIUrl":"https://doi.org/10.1364/pmed.1990.fp1","url":null,"abstract":"Because of their unique sensitivity to optical polarization during recording of information, photovoltaic crystals are of particular interest for optical data processing. Light induced refractive index changes in La3Ga5SiO15 : Pr3 + piezoelectric crystals [1] was previously studied. Hereafter, we present and analyse the first recording of holograms in one of these samples. La3Ga5SiO15 belongs to the point group symmetry 32. Our sample was grown by the Csochralski method. Its dimensions along the crystallographic xyz directions are 10.5×8.5×1.4 mm3. This sample presents a green color.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"48 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114022776","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
The investigation of LiNbO3 crystal surface properties LiNbO3晶体表面性质的研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ap6
R. Hovsepyan, V.Yu. Rilova
{"title":"The investigation of LiNbO3 crystal surface properties","authors":"R. Hovsepyan, V.Yu. Rilova","doi":"10.1364/pmed.1990.ap6","DOIUrl":"https://doi.org/10.1364/pmed.1990.ap6","url":null,"abstract":"Lithium niohkte crystals are widely used in nonlinear and integrated optics, light modulators, radiation detectors. Hence, it is interesting to research a surface conduction and crystal-metal contact effect, as well as surface influence on crystal space property.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121209890","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
Kinetics of induced nanosecond absorption in photorefractive InP:Fe 光折变InP:Fe诱导纳秒吸收动力学
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a11
P. Halter, J. Fabre, G. Roosen
{"title":"Kinetics of induced nanosecond absorption in photorefractive InP:Fe","authors":"P. Halter, J. Fabre, G. Roosen","doi":"10.1364/pmed.1990.a11","DOIUrl":"https://doi.org/10.1364/pmed.1990.a11","url":null,"abstract":"For understanding and optimization of the photo refractive gain it is important to know the basic parameters of photo-ionization and recombination processes. In the nanosecond regime the pulse energies required for maximum coupling gain in semiconductors easily reach the limit for saturation of the deep centers. especially if one of the recombination times is larger than the pulse duration. In that case, induced absorption (or bleaching) will appear due to a redistribution of the population of the different levels of the deep center and counterbalance photorefractive amplification. The present simultaneous study of the kinetics of the induced absorption and the photocurrent in an InP:Fe sample reveals a number of interesting parameters like electron and hole recombination times, ionization cross sections and Fe2+/Fe3+ concentrations.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129399906","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
Crystal Growth and Properties of Photorefractive Barium Titanate 光折变钛酸钡晶体生长及性能研究
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a1
T. Pollak, P. Schunemann
{"title":"Crystal Growth and Properties of Photorefractive Barium Titanate","authors":"T. Pollak, P. Schunemann","doi":"10.1364/pmed.1990.a1","DOIUrl":"https://doi.org/10.1364/pmed.1990.a1","url":null,"abstract":"The photorefractive properties of BaTiO3 are sensitive to the powder processing and crystal growing techniques. Variations in starting materials, and growth or annealing atmosphere have been shown to significantly impact the concentration and characteristics of photorefractive charge carriers. We have addressed the optimization of the electronic structure of BaTiO3 by examining process atmosphere and melt additives with the goal to improve the photorefractive sensitivity within the visible and near infrared spectrum.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116300798","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
Photorefractive Properties and Crystal Growth of Doped Barium Titanate 掺杂钛酸钡的光折变特性和晶体生长
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.a3
G. Godefroy
{"title":"Photorefractive Properties and Crystal Growth of Doped Barium Titanate","authors":"G. Godefroy","doi":"10.1364/pmed.1990.a3","DOIUrl":"https://doi.org/10.1364/pmed.1990.a3","url":null,"abstract":"The interest of barium titanate has increased during the ten last years for applications in optical data processing and phase conjugate wave front generation. Nevertheless, many of the physical, optical and dielectric properties of this material are not very well inderstood and the microscopic mechanism of the photorefractive phenomena is widely discussed as it is explained in the review paper of M. Klein [1].","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114206152","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
Self pulsing in a ring resonator with saturable photorefractive gain and loss 具有可饱和光折变增益和损耗的环形谐振腔中的自脉冲
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.e5
D. M. Lininger, D. D. Crouch, P. Martin, Dana Z. Anderson
{"title":"Self pulsing in a ring resonator with saturable photorefractive gain and loss","authors":"D. M. Lininger, D. D. Crouch, P. Martin, Dana Z. Anderson","doi":"10.1364/pmed.1990.e5","DOIUrl":"https://doi.org/10.1364/pmed.1990.e5","url":null,"abstract":"A ring resonator with photorefractive gain and loss is an active nonlinear system that exhibits self pulsing of the resonator intensity1. The novel feature of this resonator over single crystal resonators2,3 is the addition of a second crystal in our case to couple light out of the resonator providing a saturable loss4. The nonlinearity of a single crystal resonator is manifested in the saturation of the small signal gain. The nonlinearity of the two crystal system is enriched by the interplay between the two crystal time constants and the small signal gain and loss, as well as the addition of the second saturation point The dynamic behavior of the system can be described as a competitive interaction between gain and loss; if the gain wins, the resonator turns on, and if the loss wins the resonator remains off. Self pulsing occurs when the winner is alternately the gain and then the loss, and then the gain again, and so forth. The relative time constants, coupling strengths, and saturation points of the two crystals dictate the details of the competitive interaction. In this communication we include the loss crystal in a theory for photorefractive resonators to address the experimental observations of self pulsing.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125382876","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
Photoluminescence Spectroscopy of Doped and Undoped BaTiO3 掺杂和未掺杂BaTiO3的光致发光光谱
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.ap1
R. A. Mullen, K. L. Schumacher, B. Wechsler, M. Klein
{"title":"Photoluminescence Spectroscopy of Doped and Undoped BaTiO3","authors":"R. A. Mullen, K. L. Schumacher, B. Wechsler, M. Klein","doi":"10.1364/pmed.1990.ap1","DOIUrl":"https://doi.org/10.1364/pmed.1990.ap1","url":null,"abstract":"Despite the many important potential applications for photorefractive BaTiO31, the precise nature and the depth of the photorefractive trapping centers has yet to be positively identified. In one study2, a correlation was noted between the iron concentration as measured with EPR, the photorefractive trap density determined by two-beam coupling versus grating wavevector measurements, and the optical absorption coefficient. This tentatively identified iron as the photorefractive center in commercially-grown, nominally undoped crystals. More recently, high photorefractive gains were reported in nominally iron-free BaTiO3 crystals3, and evidence was presented3,4 that, in purposely iron-doped crystals, the most common valence states for iron are Fe+3 and Fe+4.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124894576","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
Light-Induced Charge Transport in BaTiO3 BaTiO3中的光诱导电荷输运
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.b3
L. Holtmann, A. Groll, M. Unland, E. Krätzig, A. Maillard, G. Godefroy
{"title":"Light-Induced Charge Transport in BaTiO3","authors":"L. Holtmann, A. Groll, M. Unland, E. Krätzig, A. Maillard, G. Godefroy","doi":"10.1364/pmed.1990.b3","DOIUrl":"https://doi.org/10.1364/pmed.1990.b3","url":null,"abstract":"BaTiO3 has favourable photorefractive properties [1] for applications in fast nonlinear optics such as image processing or self-pumped phase conjugation. Desirable is the optimization of the dielectric response time which is determined by the charge transport mechanisms. Only little is known about the centers involved in the photorefractive effect of BaTiO3. In this contribution we present measurements of photovoltaic effect, photo-conductivity, light-induced absorption and two-beam coupling. The results are consistent with a charge transport model based on the assumption of deep and shallow traps [2].","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222639","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
Sequential power transfer between stripes of a laser diode array via photorefractive two beam coupling in BaTiO3 利用BaTiO3光折变双光束耦合实现激光二极管阵列条纹间的顺序功率传输
Topical Meeting on Photorefractive Materials, Effects, and Devices II Pub Date : 1900-01-01 DOI: 10.1364/pmed.1990.j2
S. Maccormack, R. Eason
{"title":"Sequential power transfer between stripes of a laser diode array via photorefractive two beam coupling in BaTiO3","authors":"S. Maccormack, R. Eason","doi":"10.1364/pmed.1990.j2","DOIUrl":"https://doi.org/10.1364/pmed.1990.j2","url":null,"abstract":"The combination of the output of a semiconductor laser array into a high power, diffraction limited output is currently the subject of great interest, but is technically difficult since any system considered must exhibit a dynamic response to the phase variations of the individual stripes of the laser array. Photorefractive materials, because of their ability to cope with rapid phase variations, and in addition, display large nonlinear effects at the milli-Watt power levels associated with individual stripes of a diode laser array, provide an ideal medium in which to perform coupling techniques.","PeriodicalId":385625,"journal":{"name":"Topical Meeting on Photorefractive Materials, Effects, and Devices II","volume":"204 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123704807","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
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