Simulated Raman scattering in H2 has been investigated with circularly, linearly, and randomly polarized XeCl laser pulses by varying H2 pressure. The effects of pump radiation polarization and focusing geometry on Raman conversion to rotational and vibrational lines have been investigated. It is shown that circularly polarized pump pulses, high-angle focusing geometries, and/or Raman medium pressures favor the conversion to purely rotational lines, as a consequence of gain suppression effects on vibrational scattering.
{"title":"Rotational and vibrational Raman scattering in H2","authors":"G. De Nunzio, C. Panzera, M. Perrone","doi":"10.1117/12.316581","DOIUrl":"https://doi.org/10.1117/12.316581","url":null,"abstract":"Simulated Raman scattering in H2 has been investigated with circularly, linearly, and randomly polarized XeCl laser pulses by varying H2 pressure. The effects of pump radiation polarization and focusing geometry on Raman conversion to rotational and vibrational lines have been investigated. It is shown that circularly polarized pump pulses, high-angle focusing geometries, and/or Raman medium pressures favor the conversion to purely rotational lines, as a consequence of gain suppression effects on vibrational scattering.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128899514","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}
Z. Bozóki, J. Sneider, M. Szakáll, A. Mohacsi, G. Tóth, Z. Bor, G. Szabó
Among the numerous detection methods applicable in spectroscopic gas detection systems photoacoustics is probably the simplest, most cost effective, yet a highly sensitive one. By using a properly designed photoacoustic cell, equipped with a commercial microphone and electronics for phase sensitive detection, absorbed electromagnetic radiation as low as 10 nW can be easily detected. The choice of a suitable light source for PA gas detection, however, is crucial in order to preserve the simplicity and practical advantages of the combined gas detection system. In the photoacoustic system presented here, therefore, external cavity diode lasers have been adopted. Contrary to ordinary diode lasers, external cavity diode lasers are ideal sources for spectroscopic studies as they have a narrow linewidth and ar continuously tunable in a relative wide wavelength range. External cavity diode lasers operating in different wavelength range have been developed and concentration determination of water vapor gaseous mixtures are presented. Sensitivity of the system presented here could reach the ppb. level under optimal conditions.
{"title":"Gas-detection instrument based on external-cavity diode lasers and photoacoustic detectors","authors":"Z. Bozóki, J. Sneider, M. Szakáll, A. Mohacsi, G. Tóth, Z. Bor, G. Szabó","doi":"10.1117/12.316590","DOIUrl":"https://doi.org/10.1117/12.316590","url":null,"abstract":"Among the numerous detection methods applicable in spectroscopic gas detection systems photoacoustics is probably the simplest, most cost effective, yet a highly sensitive one. By using a properly designed photoacoustic cell, equipped with a commercial microphone and electronics for phase sensitive detection, absorbed electromagnetic radiation as low as 10 nW can be easily detected. The choice of a suitable light source for PA gas detection, however, is crucial in order to preserve the simplicity and practical advantages of the combined gas detection system. In the photoacoustic system presented here, therefore, external cavity diode lasers have been adopted. Contrary to ordinary diode lasers, external cavity diode lasers are ideal sources for spectroscopic studies as they have a narrow linewidth and ar continuously tunable in a relative wide wavelength range. External cavity diode lasers operating in different wavelength range have been developed and concentration determination of water vapor gaseous mixtures are presented. Sensitivity of the system presented here could reach the ppb. level under optimal conditions.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"7 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120815515","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}
H. Kambezidis, T. Efthimiopoulos, G. Ehret, S. Kotsopoulos, D. Zevgolis, G. Economou, C. Kosmidis, A. Adamopoulos, A. Doukas, P.-M. Gogou, Dimitrios Karaboulas, J. Katsenos
This paper describes the needs for establishing a mobile laser laboratory (LIDAR) for air pollution monitoring in the Athens area. It also gives the specifications of the laser unit of the LIDAR system and the various studies to be performed in Athens area.
{"title":"Advanced-technology laser-aided air pollution monitoring in Athens: the Greek differential absorption lidar","authors":"H. Kambezidis, T. Efthimiopoulos, G. Ehret, S. Kotsopoulos, D. Zevgolis, G. Economou, C. Kosmidis, A. Adamopoulos, A. Doukas, P.-M. Gogou, Dimitrios Karaboulas, J. Katsenos","doi":"10.1117/12.316595","DOIUrl":"https://doi.org/10.1117/12.316595","url":null,"abstract":"This paper describes the needs for establishing a mobile laser laboratory (LIDAR) for air pollution monitoring in the Athens area. It also gives the specifications of the laser unit of the LIDAR system and the various studies to be performed in Athens area.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126577133","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}
C. Kosmidis, K. Ledingham, H. Kılıç, T. McCanny, R. P. Singhal, D. Smith, A. Langley
The 90 femtosecond laser induced fragmentation at 375 nm for a number of different nitro-molecules is compared to that induced by a nanosecond laser at the same wavelength by means of time-of-flight mass spectrometry. The potential of femtosecond laser mass spectrometry for analytical purposes is discussed.
{"title":"Molecular fragmentation induced by a femtosecond laser","authors":"C. Kosmidis, K. Ledingham, H. Kılıç, T. McCanny, R. P. Singhal, D. Smith, A. Langley","doi":"10.1117/12.316582","DOIUrl":"https://doi.org/10.1117/12.316582","url":null,"abstract":"The 90 femtosecond laser induced fragmentation at 375 nm for a number of different nitro-molecules is compared to that induced by a nanosecond laser at the same wavelength by means of time-of-flight mass spectrometry. The potential of femtosecond laser mass spectrometry for analytical purposes is discussed.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125481285","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 fluorescence spectrum of rhodamine 6G incorporated in thin surfactant films demonstrates an extensive narrowing of the spectral width at relatively low excitation light fluence due to coherent scattering caused by molecular aggregates present in the film.
{"title":"Spectral narrowing in the emission of rhodamine 6G incorporated in thin surfactant films","authors":"E. Stathatos, S. Couris, P. Lianos","doi":"10.1117/12.316587","DOIUrl":"https://doi.org/10.1117/12.316587","url":null,"abstract":"The fluorescence spectrum of rhodamine 6G incorporated in thin surfactant films demonstrates an extensive narrowing of the spectral width at relatively low excitation light fluence due to coherent scattering caused by molecular aggregates present in the film.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"3423 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129075116","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}
S. Bollanti, R. Cotton, P. Di Lazzaro, F. Flora, G. Giordano, G. Schina, T. Letardi, N. Lisi, A. Nottola, K. Vigli-Papadaki, A. Reale, L. Palladino, L. Reale, M. Belli, F. Ianzini, M. A. Tobocchini, A. Scafati, A. Faenov, T. Pikuz, P. Albertano
A high brightness x-ray source has been obtained by focusing the large aperture excimer laser HERCULES on a solid target with a laser intensity of more than 1013W/cm2. The characteristics of the x-ray source for different laser time evolution in the range 6-120 ns are investigated. Experimental result on specific applications of the source, like the soft x-ray contact microscopy and the low photon energy radiobiology will be presented.
{"title":"Applications of an x-ray plasma source driven by an excimer laser: in vivo microscopy, microradiography, and radiobiology","authors":"S. Bollanti, R. Cotton, P. Di Lazzaro, F. Flora, G. Giordano, G. Schina, T. Letardi, N. Lisi, A. Nottola, K. Vigli-Papadaki, A. Reale, L. Palladino, L. Reale, M. Belli, F. Ianzini, M. A. Tobocchini, A. Scafati, A. Faenov, T. Pikuz, P. Albertano","doi":"10.1117/12.316625","DOIUrl":"https://doi.org/10.1117/12.316625","url":null,"abstract":"A high brightness x-ray source has been obtained by focusing the large aperture excimer laser HERCULES on a solid target with a laser intensity of more than 1013W/cm2. The characteristics of the x-ray source for different laser time evolution in the range 6-120 ns are investigated. Experimental result on specific applications of the source, like the soft x-ray contact microscopy and the low photon energy radiobiology will be presented.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130468230","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}
P. Argitis, A. Cefalas, Z. Kollia, E. Sarantopoulou, T. Ford, Tony Stead, A. Marranca, C. Danson, J. Knott, D. Neely
We report on the use of an epoxy novolac chemically amplified photoresist, to get x-ray images of living biological species in the water window of soft x-rays. This photoresist response was at least two orders of magnitude 'faster' than the standard used PMMA in contact x-ray microscopy. Atomic force microscopy of the resist, relief images obtained with biological specimen masking, suggests a resolution better than 300 nm in lateral dimensions - the size of the cell flagellas - and 20 nm in depth profiles.
{"title":"Single-pulse high-resolution x-ray contact microscopy with an advanced epoxy novolac resist","authors":"P. Argitis, A. Cefalas, Z. Kollia, E. Sarantopoulou, T. Ford, Tony Stead, A. Marranca, C. Danson, J. Knott, D. Neely","doi":"10.1117/12.316626","DOIUrl":"https://doi.org/10.1117/12.316626","url":null,"abstract":"We report on the use of an epoxy novolac chemically amplified photoresist, to get x-ray images of living biological species in the water window of soft x-rays. This photoresist response was at least two orders of magnitude 'faster' than the standard used PMMA in contact x-ray microscopy. Atomic force microscopy of the resist, relief images obtained with biological specimen masking, suggests a resolution better than 300 nm in lateral dimensions - the size of the cell flagellas - and 20 nm in depth profiles.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122999730","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}
S. Martellucci, G. Messina, A. Paoletti, M. Richetta, S. Santangelo, A. Spena, A. Tebano, A. Tucciarone
Recently the application of pulsed laser deposition (PLD) technique to grow different material of relevant interest for applications, especially in the field of micro devices, has been considered. We show that thin films of diamond like carbon (DLC) can be grown by means of the PLD technique, using an XeCl excimer laser. Their characterization was carried out by SEM, Raman spectroscopy and microindenter. We started a study on the etching mechanism of DLC films for possible applications in microsystems technology.
{"title":"Pulsed laser deposition and laser machining of diamondlike carbon films","authors":"S. Martellucci, G. Messina, A. Paoletti, M. Richetta, S. Santangelo, A. Spena, A. Tebano, A. Tucciarone","doi":"10.1117/12.316604","DOIUrl":"https://doi.org/10.1117/12.316604","url":null,"abstract":"Recently the application of pulsed laser deposition (PLD) technique to grow different material of relevant interest for applications, especially in the field of micro devices, has been considered. We show that thin films of diamond like carbon (DLC) can be grown by means of the PLD technique, using an XeCl excimer laser. Their characterization was carried out by SEM, Raman spectroscopy and microindenter. We started a study on the etching mechanism of DLC films for possible applications in microsystems technology.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123922753","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}
G. Papastergiou, S. Matakias, I. Koukouvinos, G. Stratakos, N. Uzunoglou
A fiber optic delay line was designed and developed to be used in a microwave signal processing system. The device was based on a 10km 9/125 microns single mode fiber delay line. A single mode 1550nm/1mW laser diode was used as a transmitter modulated up to 500MHz. A PIN photodiode with incorporated transimpedance amplifier was used to convert the optical signal back to the electrical. The paper presents full technical details and optical performance characteristics of a low cost easy to use fiber optic delay line.
{"title":"Development of a cost-effective fiber optic delay line","authors":"G. Papastergiou, S. Matakias, I. Koukouvinos, G. Stratakos, N. Uzunoglou","doi":"10.1117/12.316561","DOIUrl":"https://doi.org/10.1117/12.316561","url":null,"abstract":"A fiber optic delay line was designed and developed to be used in a microwave signal processing system. The device was based on a 10km 9/125 microns single mode fiber delay line. A single mode 1550nm/1mW laser diode was used as a transmitter modulated up to 500MHz. A PIN photodiode with incorporated transimpedance amplifier was used to convert the optical signal back to the electrical. The paper presents full technical details and optical performance characteristics of a low cost easy to use fiber optic delay line.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117231341","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}
A. Beloglazov, V. Nassisi, V. Konov, S. Pimenov, A. Rainò, V. Stagno
In this work the electron beam current and beam emittance measured for an Al and a diamond film cathode irradiated with two different UV excimer lasers, XeCl and KrCl, are presented. The output current was measured with a fast Rogowski coil while the emittance was determined with a new diagnostic setup composed by two movable slit arrays and an array of small cups. The phase space area occupied by the electrons at the output was determined by the current measured with the cups and by the position of the slits. With a 4 mm2 beam spot the maximum current from an Al cathode was 740 mA and from a diamond cathode was 560 mA with the KrCl laser. The corresponding emittance values were 130 and 50 for the Al and the diamond cathode, respectively. From these values the normalized beam brightness were estimated to be 0.18 X 109 A((pi) m rad)-2 for Al cathode and 0.92 X 109 A((pi) mrad)-2 for diamond cathode.
本文介绍了用两种不同的紫外准分子激光器XeCl和KrCl辐照铝膜阴极和金刚石膜阴极的电子束电流和束发射度的测量。输出电流用快速Rogowski线圈测量，发射度用由两个可移动狭缝阵列和一个小杯阵列组成的新型诊断装置测定。电子在输出端所占据的相空间面积由用杯测量的电流和狭缝的位置决定。在4 mm2的光束光斑下，KrCl激光器从Al阴极输出的最大电流为740 mA，从金刚石阴极输出的最大电流为560 mA。铝阴极和金刚石阴极的发射度分别为130和50。根据这些值，估计铝阴极的归一化光束亮度为0.18 X 109 A((pi) mrad)-2，金刚石阴极的归一化光束亮度为0.92 X 109 A((pi) mrad)-2。
{"title":"Emission and emittance measurements of electron beams generated from metal and diamond photocathodes","authors":"A. Beloglazov, V. Nassisi, V. Konov, S. Pimenov, A. Rainò, V. Stagno","doi":"10.1117/12.316614","DOIUrl":"https://doi.org/10.1117/12.316614","url":null,"abstract":"In this work the electron beam current and beam emittance measured for an Al and a diamond film cathode irradiated with two different UV excimer lasers, XeCl and KrCl, are presented. The output current was measured with a fast Rogowski coil while the emittance was determined with a new diagnostic setup composed by two movable slit arrays and an array of small cups. The phase space area occupied by the electrons at the output was determined by the current measured with the cups and by the position of the slits. With a 4 mm2 beam spot the maximum current from an Al cathode was 740 mA and from a diamond cathode was 560 mA with the KrCl laser. The corresponding emittance values were 130 and 50 for the Al and the diamond cathode, respectively. From these values the normalized beam brightness were estimated to be 0.18 X 109 A((pi) m rad)-2 for Al cathode and 0.92 X 109 A((pi) mrad)-2 for diamond cathode.","PeriodicalId":373160,"journal":{"name":"GR-I International Conference on New Laser Technologies and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115270709","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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