2014 International Conference Laser Optics最新文献

{"title":"Numerical simulations on self-focusing and filamentation of multi-terawatt picosecond CO2-laser pulse in air","authors":"A. Zemlyanov, Y. Geints","doi":"10.1109/LO.2014.6886337","DOIUrl":"https://doi.org/10.1109/LO.2014.6886337","url":null,"abstract":"At present, CO2-laser is the only actual source of high-power 10-μm radiation traditionally used in various atmospheric optics applications where the extreme power at joule energy in laser pulse is crucial. The advent of high-pressure CO2:N2O gas mixture lasers involves a significant increase of the output pulse power up to multiterawatt level due to laser pulse shortening down to few picoseconds and even to hundreds of femtoseconds. The mid-IR spectral region is attractive because at the relatively low continual absorption the atmosphere can linearly transfer light power up to several terawatts. Further increase of laser power gives rise to nonlinear losses of propagating radiation, which is mostly due to ionization and optical breakdown of air against the background of Kerr self-focusing and filamentation of a laser beam.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128531274","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}

{"title":"Passive V:YAG Q-switching operation of 1.34-µm Nd:YAG laser with loop cavity","authors":"M. N. Ershkov, A. Gavrilov, A. Fedin, S. Smetanin, S. A. Solokhin","doi":"10.1109/LO.2014.6886247","DOIUrl":"https://doi.org/10.1109/LO.2014.6886247","url":null,"abstract":"Passive Q-switching operation of the flash-lamp pumped 1.34-μm Nd:YAG laser with loop cavity is experimentally investigated. Using a passive 47-% V:YAG Q-switch the laser generated the 380-mJ trains of 260-ns laser pulses with an individual pulse energy of 27 mJ.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128648016","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}

{"title":"Experimental observation for new polymorphs of silicon formed through ultrafast-laser-induced microexplosion","authors":"L. Rapp, B. Haberl, C. Pickard, J. Bradby, E. Gamaly, J. Williams, A. Rode","doi":"10.1109/LO.2014.6886284","DOIUrl":"https://doi.org/10.1109/LO.2014.6886284","url":null,"abstract":"Summary form only given. Intense ultrafast laser pulses tightly focused in the bulk of transparent material produce plasma in the extreme conditions similar to those in the cores of planets. The plasma generates strong shock waves in such confined geometry, thus inducing a laser-ignited microexplosion. This new method of compression of matter by ultra-short laser induced micro-explosion generates pressures in excess of Terapascals, leaving all the pressure/temperature-affected material confined inside the bulk of pristine crystal for the further investigations. In contrast to dynamic (shock wave) and static (diamond-anvil cell) methods, the initial materials in a microexplosion are transformed into the high entropy state of extreme dense plasma where the memory of the initial state is completely lost. This state is similar to “a primeval soup” at the early stages of the Universe evolution. The randomised material swiftly cools down isochorically to ambient in a short, nanosecond-scale time. For example, it was demonstrated that a sapphire crystal converted by a fs-laser pulse to plasma returns to the ambient state as a mixture of nano-crystallites of the previously unobserved form of bcc-aluminium. In this presentation the new experimental results evidencing the formation of novel structures in laserinduced confined micro-explosion in silicon will be highlighted. Electron diffraction pattern of the shock wave isochorically affected areas reveals the presence of a mixture of silicon phases with a number of previously unidentified diffraction spots. Indexation of the diffraction patterns from various microexplosion sites demonstrate close correlation between the numerically predicted phases and the observed diffracted spots. The observation of a new Si phase is a confirmation that ultrafast laser-induced microexplosion in confine geometry is a unique method for dynamic generation of transient states of matter by fast quenching from the laser-induced plasma where the new phases are reserved for further studies.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130566360","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}

{"title":"The special aspects of neodymium and copper-containing phosphate glasses production for large-scaled disk active elements of power high-energy lasers and radiation amplifiers","authors":"L. I. Avakyants, A. N. Ignatov, E. Y. Krekhova, A. Pozdnyakov, V. F. Surkova, V. Arbuzov, M. V. Voroshilova, A. Dmitryuk, S. Kramarev, S. I. Nikitina, Yu. K. Fyodorov","doi":"10.1109/LO.2014.6886228","DOIUrl":"https://doi.org/10.1109/LO.2014.6886228","url":null,"abstract":"The necessity of creating the power high-energy radiation amplifiers requires the production of increasingly large disk active elements (DAE). Increasing the size of the required DAE leads to certain problems while their multistage production. Some of them, primarily related to the terms of melting were reviewed.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130603200","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}

{"title":"Graphene plasmonic heterostructures for terahertz device applications","authors":"T. Otsuji, A. Satou, S. B. Tombet, V. Ryzhii, V. Popov, M. Shur","doi":"10.1109/LO.2014.6886421","DOIUrl":"https://doi.org/10.1109/LO.2014.6886421","url":null,"abstract":"This paper reviews recent advances in graphene plasmonic heterostructures for terahertz (THz) device applications. A double graphene-layer (DGL) core-shell structure with a tunnel-barrier layer is sandwiched between the outer gate stack layers at both sides. When the band offset is aligned to the THz photon energy, the DGL structure can mediate photon-assisted resonant tunneling, resulting in resonant emission or detection of the THz radiation. The cooperative double-resonant excitation with structure-sensitive graphene plasmons gives rise to various functionalities in the THz device implementations.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129889892","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}

{"title":"Implementation of multiterawatt femtosecond laser system at kilohertz repetition rate","authors":"V. Petrov, A. Laptev, E. Pestryakov, G. V. Kuptsov, V. Petrov, S. Frolov, V. Trunov, A. Kirpichnikov","doi":"10.1109/LO.2014.6886276","DOIUrl":"https://doi.org/10.1109/LO.2014.6886276","url":null,"abstract":"The report presents the basic principles of creation, scheme and the components of multiterawatt laser system at kilohertz repetition rate based on parametric amplification of femtosecond pulses and laser amplification of picosecond pulses for pumping of stages of parametric amplifier. On developed element base in pump channel of laser system, parameters of regenerative amplifier with output energies about 1 mJ at repetition rate of 1 kHz and central wavelength 1030 nm are experimentally investigated. Optical scheme of multipass cryogenic amplifier based on diode pumped Yb:Y2O3 laser ceramics is developed and parameters for increasing of output energy up to ~ 0.25-0.35 J are determined.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122432955","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}

{"title":"Two-photon recording of stable luminescent centers in chromone-doped polymer films","authors":"A. Ayt, V. A. Barachevsky, O. I. Kobeleva, T. Valova, S. Gagarskiy, V. Kiyko, A. N. Sergeev, A. Veniaminov, V. Zakharov, M. Krayushkin, H. Iglev","doi":"10.1109/LO.2014.6886252","DOIUrl":"https://doi.org/10.1109/LO.2014.6886252","url":null,"abstract":"The study defines threshold values of energy density required for two-photon writing of stable fluorescent bit patterns within polymer layers containing chromones class chemical compounds by visual laser pulses in range of pulse widths from nanoseconds to femtoseconds. Photo-regrouping of non-luminescent chromones to fluorescent products is shown as the result of true type two-photon absorption (TPA) and stepwise TPA as well. In the latter case writing beam fluence can be reduced due to increase of the effective TPA coefficient, but laser-induced thermal damage of matrix becomes more probable too.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"217 S697","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120854578","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}

{"title":"Use of selective reflection process to study “forbidden” atomic transitions of Cs D2 line","authors":"A. Sargsyan, A. Amiryan, D. Sarkisyan, T. Vartanyan","doi":"10.1109/LO.2014.6886204","DOIUrl":"https://doi.org/10.1109/LO.2014.6886204","url":null,"abstract":"Summary form only given: It is demonstrated that the use of Selective Reflection process obtained with the help of a thin cells filled with the Cs atomic vapor allows one to detect seven Fg=3 → Fe=5 atomic transitions in an external magnetic field in the range of 0.5-3 kG.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"313 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116530775","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}

{"title":"Experimental testing of the diffraction method for optical wavefield recording","authors":"S. Stukachev, I. Kozhevatov","doi":"10.1109/LO.2014.6886313","DOIUrl":"https://doi.org/10.1109/LO.2014.6886313","url":null,"abstract":"The novel diffraction method for optical wavefield recording is proposed. The experimental testing of the method was carried out. It was shown that the diffraction method provides wavefront measurements with high accuracy and spacial resolution.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124023450","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}

{"title":"Free-base and metallated bis-tetraphenylporphyrin covalent ensembles for optical power limiting","authors":"I. Kislyakov, I. Belousova, S. Povarov, Ivan S. Sheiko, A. Konev, D. Lukyanov, A. Khlebnikov","doi":"10.1109/LO.2014.6886384","DOIUrl":"https://doi.org/10.1109/LO.2014.6886384","url":null,"abstract":"Summary form only given: Nonlinear absorption of metallated tetraphenylporphyrin (TPP), halogene substituted TPP and bis-TPP covalent ensembles is studied in a wide spectral range of visible and infrared light. Advantages of complexation with Pb and π-conjugation of bis-porphyrin ensembles for reverse saturable and two-photon absorptions were demonstrated. The compounds are useful for optical power limiting applications.","PeriodicalId":191027,"journal":{"name":"2014 International Conference Laser Optics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127432460","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}