Pub Date : 2012-10-01DOI: 10.1109/ICP.2012.6379868
S. Aithal, Sreeramana Aithal, N. G. Bhat
Optical phase conjugation through degenerate four-wave mixing is observed in 4-[4-(Dimethylamino)styryl]-1-docosyl pyridinium bromide (DASPB) dye-doped in Polymethyl methacrylate - metacrylic acid (PMMA-PA) polymer films under low-power, continuous-wave laser irradiation. A maximum phase conjugate efficiency of 0.42% has been obtained for probe beam intensity at 2.5 W/cm2. Phase conjugation is observed for both parallel- and orthogonally-polarized probe and pump beams. The maximum PC reflectivity is achieved when the angle between probe beam and forward pump beam is 8 degrees. The effects of dye concentration, inter beam angle between probe and forward pump beam on phase conjugation reflectivity are also studied. PC signal strength first increases and then decreases with time. PC reflectivity is also increased by increasing the intensity of the backward and forward pump beam. The polarization and intensity profile are verified to be preserved in the conjugate signal. The predominant phase conjugation signal is attributed due to the saturable absorption and two photon induced fluorescence property of the dye molecules.
{"title":"Phase conjugation in two photon absorbing dye films by degenerate four-wave mixing","authors":"S. Aithal, Sreeramana Aithal, N. G. Bhat","doi":"10.1109/ICP.2012.6379868","DOIUrl":"https://doi.org/10.1109/ICP.2012.6379868","url":null,"abstract":"Optical phase conjugation through degenerate four-wave mixing is observed in 4-[4-(Dimethylamino)styryl]-1-docosyl pyridinium bromide (DASPB) dye-doped in Polymethyl methacrylate - metacrylic acid (PMMA-PA) polymer films under low-power, continuous-wave laser irradiation. A maximum phase conjugate efficiency of 0.42% has been obtained for probe beam intensity at 2.5 W/cm2. Phase conjugation is observed for both parallel- and orthogonally-polarized probe and pump beams. The maximum PC reflectivity is achieved when the angle between probe beam and forward pump beam is 8 degrees. The effects of dye concentration, inter beam angle between probe and forward pump beam on phase conjugation reflectivity are also studied. PC signal strength first increases and then decreases with time. PC reflectivity is also increased by increasing the intensity of the backward and forward pump beam. The polarization and intensity profile are verified to be preserved in the conjugate signal. The predominant phase conjugation signal is attributed due to the saturable absorption and two photon induced fluorescence property of the dye molecules.","PeriodicalId":243533,"journal":{"name":"2012 IEEE 3rd International Conference on Photonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130472748","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 : 2012-10-01DOI: 10.1109/ICP.2012.6379882
S. Yeoh, M. Jafri, A. Omar
Interferometer is a device, which splits light waves into two components. The two beams travel in different paths and recombine after some relative propagation phase delay. Among the most commercial interferometers in the optical industries are Michelson, Fabry-Perot and Mach-Zehnder. In this paper, the basic operating principles and application fields of each type of interferometer are reviewed. The optical designs were conducted by running a simulation on a commercial optical software package, ASAP.
{"title":"Revisiting the operating principles and application of interferometers","authors":"S. Yeoh, M. Jafri, A. Omar","doi":"10.1109/ICP.2012.6379882","DOIUrl":"https://doi.org/10.1109/ICP.2012.6379882","url":null,"abstract":"Interferometer is a device, which splits light waves into two components. The two beams travel in different paths and recombine after some relative propagation phase delay. Among the most commercial interferometers in the optical industries are Michelson, Fabry-Perot and Mach-Zehnder. In this paper, the basic operating principles and application fields of each type of interferometer are reviewed. The optical designs were conducted by running a simulation on a commercial optical software package, ASAP.","PeriodicalId":243533,"journal":{"name":"2012 IEEE 3rd International Conference on Photonics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125983394","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 : 2012-10-01DOI: 10.1109/ICP.2012.6379827
P. Peterka, B. Dussardier, W. Blanc, I. Kašík, P. Honzátko
Thulium-doped fibers are renowned for their applications in high power fiber lasers at around 2 μm. It is despite the low quantum conversion efficiency of 3F4 level in thulium doped silica fibers, which is about 10% compared to ~100% quantum conversion efficiency of the ytterbium- and erbium-doped fibers, at around 1 μm and 1.5 μm, respectively. The lower quantum conversion efficiency increases the 2 μm laser threshold but has almost no effect on the laser slope efficiency. Indeed, kW-class thulium-doped fiber lasers have been demonstrated recently. Quantum conversion efficiency of the 3H4 level in non-modified silica fibers is much lower than that of 3F4 level, only about 2% and therefore most of the applications of laser transitions originating from 3H4 level are hindered by the lack of reliable low-phonon fiber host. We review of our contributions towards the comprehension and improvement of the spectroscopic properties of thulium ions doped into silica. We show potential of the developed thulium-doped fibers with enhanced 3H4 level lifetime for applications in fiber lasers around 810 nm and in fiber amplifiers for communication S-band (1460-1530 nm).
{"title":"Thulium-doped silica fibers with enhanced 3H4 level lifetime for fiber lasers and amplifiers","authors":"P. Peterka, B. Dussardier, W. Blanc, I. Kašík, P. Honzátko","doi":"10.1109/ICP.2012.6379827","DOIUrl":"https://doi.org/10.1109/ICP.2012.6379827","url":null,"abstract":"Thulium-doped fibers are renowned for their applications in high power fiber lasers at around 2 μm. It is despite the low quantum conversion efficiency of <sup>3</sup>F<sub>4</sub> level in thulium doped silica fibers, which is about 10% compared to ~100% quantum conversion efficiency of the ytterbium- and erbium-doped fibers, at around 1 μm and 1.5 μm, respectively. The lower quantum conversion efficiency increases the 2 μm laser threshold but has almost no effect on the laser slope efficiency. Indeed, kW-class thulium-doped fiber lasers have been demonstrated recently. Quantum conversion efficiency of the <sup>3</sup>H<sub>4</sub> level in non-modified silica fibers is much lower than that of <sup>3</sup>F<sub>4</sub> level, only about 2% and therefore most of the applications of laser transitions originating from <sup>3</sup>H<sub>4</sub> level are hindered by the lack of reliable low-phonon fiber host. We review of our contributions towards the comprehension and improvement of the spectroscopic properties of thulium ions doped into silica. We show potential of the developed thulium-doped fibers with enhanced <sup>3</sup>H<sub>4</sub> level lifetime for applications in fiber lasers around 810 nm and in fiber amplifiers for communication S-band (1460-1530 nm).","PeriodicalId":243533,"journal":{"name":"2012 IEEE 3rd International Conference on Photonics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114779184","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 : 2012-10-01DOI: 10.1109/icp.2012.6379529
B. Kuhlmey, A. Tuniz, O. T. Naman, Neetesh Singh, R. Lwin, S. Atakaramians, A. Argyros, S. Fleming
Fibre drawing techniques are used to produce metamaterials with electric and magnetic responses for the terahertz and far-infrared spectrum. This technique can be scaled to mass production and operation at optical wavelengths.
{"title":"Drawn metamaterials","authors":"B. Kuhlmey, A. Tuniz, O. T. Naman, Neetesh Singh, R. Lwin, S. Atakaramians, A. Argyros, S. Fleming","doi":"10.1109/icp.2012.6379529","DOIUrl":"https://doi.org/10.1109/icp.2012.6379529","url":null,"abstract":"Fibre drawing techniques are used to produce metamaterials with electric and magnetic responses for the terahertz and far-infrared spectrum. This technique can be scaled to mass production and operation at optical wavelengths.","PeriodicalId":243533,"journal":{"name":"2012 IEEE 3rd International Conference on Photonics","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134564913","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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