The titanium oxide films were deposited on glass by reactive sputtering system, in different oxygen partial pressure. In this paper we present the IR absorption of TiOx thin films, deposited through a d.c. circular magnetron system. We found several common peaks of absorption located around 500 cm-1, 530 cm-1, 582 cm-1, 638 cm-1 and 800 cm-1 that are corresponding to Ti- Ox links energy.
{"title":"IR absorption of TiO2 thin films","authors":"M. Stamate, G. Rusu, I. Vascan","doi":"10.1117/12.312696","DOIUrl":"https://doi.org/10.1117/12.312696","url":null,"abstract":"The titanium oxide films were deposited on glass by reactive sputtering system, in different oxygen partial pressure. In this paper we present the IR absorption of TiOx thin films, deposited through a d.c. circular magnetron system. We found several common peaks of absorption located around 500 cm-1, 530 cm-1, 582 cm-1, 638 cm-1 and 800 cm-1 that are corresponding to Ti- Ox links energy.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121588249","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}
Silver and copper double activated phosphor samples were synthesized from zinc sulphide prepared by thiosulphate method and with a NaCl-MgCl2 mixture as flux. The thermal treatment was performed in a protective atmosphere at 900 - 1100 degree(s)C. The samples were characterized by crystalline structure (XRD patterns) and luminescent properties (emission spectra, decay curves). An intensification effect of the copper green fluorescence by silver ions was put in evidence. Conditions for a good green emitting phosphor were established.
{"title":"Luminescence properties of some double-activated zinc-sulphide-type phosphors","authors":"E. Popovici, M. Aneculaese, Veronica Ursu","doi":"10.1117/12.312821","DOIUrl":"https://doi.org/10.1117/12.312821","url":null,"abstract":"Silver and copper double activated phosphor samples were synthesized from zinc sulphide prepared by thiosulphate method and with a NaCl-MgCl2 mixture as flux. The thermal treatment was performed in a protective atmosphere at 900 - 1100 degree(s)C. The samples were characterized by crystalline structure (XRD patterns) and luminescent properties (emission spectra, decay curves). An intensification effect of the copper green fluorescence by silver ions was put in evidence. Conditions for a good green emitting phosphor were established.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131979074","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}
J. R. de F. Moneo, I. Juvells, S. Vallmitjana, S. Bosch, A. Carnicer, I. Labastida, J. Pérez-Tudela
The proposal of this work is the study of a method for characterization of the focal of ophthalmic lenses whose surface refraction index has been modified by diffusion techniques based on thermal ion exchange in glass. In particular the aim is the measurement of the variations in focal length of ophthalmic lenses after undergoing a diffusion process. An interferometric technique has been used and computer simulations have also been carried out.
{"title":"Interferometric characterization of GRIN lenses for ophthalmic uses","authors":"J. R. de F. Moneo, I. Juvells, S. Vallmitjana, S. Bosch, A. Carnicer, I. Labastida, J. Pérez-Tudela","doi":"10.1117/12.312729","DOIUrl":"https://doi.org/10.1117/12.312729","url":null,"abstract":"The proposal of this work is the study of a method for characterization of the focal of ophthalmic lenses whose surface refraction index has been modified by diffusion techniques based on thermal ion exchange in glass. In particular the aim is the measurement of the variations in focal length of ophthalmic lenses after undergoing a diffusion process. An interferometric technique has been used and computer simulations have also been carried out.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132367723","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}
R. Rădvan, M. Calin, R. Savastru, M. Robu, M. Radu
This work presents some contribution in the non-conventional optical components field. The idea is concerning to fluid optical components, having in view to elaborate a documentation--like a catalogue of optical fluids--for optical system design. The using of optical fluids represents a new method of attaining apochromatic color correction in refractive optical systems.
{"title":"Fluid optical components and their applications in optoelectronics","authors":"R. Rădvan, M. Calin, R. Savastru, M. Robu, M. Radu","doi":"10.1117/12.312666","DOIUrl":"https://doi.org/10.1117/12.312666","url":null,"abstract":"This work presents some contribution in the non-conventional optical components field. The idea is concerning to fluid optical components, having in view to elaborate a documentation--like a catalogue of optical fluids--for optical system design. The using of optical fluids represents a new method of attaining apochromatic color correction in refractive optical systems.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132452063","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}
M. Pascu, N. Moise, L. Voicu, T. Negoita, G. Manolescu, Adriana Smarandache
Pesticides monitoring at low concentrations using optical absorption, laser induced fluorescence (LIF), fluorescence lifetime measurements and gas chromatography are reported. The studied pesticides were chlortriasines (athrasine, propasine and simasine) and organophosphoric pesticides (dichlorvos and parathion). Since in normal conditions the chlortriasines show absorption spectra in ultraviolet (around 250 nm), to obtain fluorescence spectra in the visible they were treated with pyridine and ethyl ester of cyanoacetic acid in basic medium. The LIF spectra of chlortriasines are measured at concentrations of pollutants between 5 ppm and 20 ppm. The molecular complex fluorescence spectrum induced by pulsed laser radiation at 545 nm, available from a tunable dye laser, exhibited a maximum of 577 nm; it remained unchanged for three hours, following which the intensity decreases as a consequence of the complex destruction (decomposition). The fluorescence lifetime of the molecular complex measured using a fast photodetector was 2.6 ns, immediately after complex formation. The organophosphoric pesticides were monitored using a rather different initial chemical treatment, at the end of which a quinino-vanado- molibdophosphoric complex (PMo10V2O39)2(C20H24O2N2H2)3 was formed. The fluorescence spectra of these pesticides induced by pulsed laser radiation at 337.1 nm available from a pulsed nitrogen laser (700 ps pulse time width, 300 (mu) J/pulse energy) exhibited a maximum at 445 nm with a FWHM of 80 nm. The low concentration detection limits were 0.2 ppm for P in dichlorvos (dichlorvos concentration 14.18 ppm) and 0.2 ppm for P in parathion (parathion concentration 17.8 ppm). These methods in correlation with optical absorption, classical fluorescence and gas chromatography methods were applied to monitor pesticides in water samples collected from the North Pole zone following two expeditions dated March-April 1995 to Severenaia Zemlia Archipelago and July-August 1996 to Spitzbergen Archipelago. Comments about the monitoring of pesticides content of these samples are made.
{"title":"Laser monitoring of pesticides in water","authors":"M. Pascu, N. Moise, L. Voicu, T. Negoita, G. Manolescu, Adriana Smarandache","doi":"10.1117/12.312739","DOIUrl":"https://doi.org/10.1117/12.312739","url":null,"abstract":"Pesticides monitoring at low concentrations using optical absorption, laser induced fluorescence (LIF), fluorescence lifetime measurements and gas chromatography are reported. The studied pesticides were chlortriasines (athrasine, propasine and simasine) and organophosphoric pesticides (dichlorvos and parathion). Since in normal conditions the chlortriasines show absorption spectra in ultraviolet (around 250 nm), to obtain fluorescence spectra in the visible they were treated with pyridine and ethyl ester of cyanoacetic acid in basic medium. The LIF spectra of chlortriasines are measured at concentrations of pollutants between 5 ppm and 20 ppm. The molecular complex fluorescence spectrum induced by pulsed laser radiation at 545 nm, available from a tunable dye laser, exhibited a maximum of 577 nm; it remained unchanged for three hours, following which the intensity decreases as a consequence of the complex destruction (decomposition). The fluorescence lifetime of the molecular complex measured using a fast photodetector was 2.6 ns, immediately after complex formation. The organophosphoric pesticides were monitored using a rather different initial chemical treatment, at the end of which a quinino-vanado- molibdophosphoric complex (PMo10V2O39)2(C20H24O2N2H2)3 was formed. The fluorescence spectra of these pesticides induced by pulsed laser radiation at 337.1 nm available from a pulsed nitrogen laser (700 ps pulse time width, 300 (mu) J/pulse energy) exhibited a maximum at 445 nm with a FWHM of 80 nm. The low concentration detection limits were 0.2 ppm for P in dichlorvos (dichlorvos concentration 14.18 ppm) and 0.2 ppm for P in parathion (parathion concentration 17.8 ppm). These methods in correlation with optical absorption, classical fluorescence and gas chromatography methods were applied to monitor pesticides in water samples collected from the North Pole zone following two expeditions dated March-April 1995 to Severenaia Zemlia Archipelago and July-August 1996 to Spitzbergen Archipelago. Comments about the monitoring of pesticides content of these samples are made.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"297 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132692438","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 new optical resonator configuration for transverse flow CO2 laser was developed. A high value of the matching coefficient (the cross section of the laser beam/the cross section of the electrical discharge)-(eta) m, is obtained for laser beams with TEM00/01 intensity distribution (that corresponds to the low values of the Fresnel number-NF of the optical resonator). Simultaneously, both types of the gain and refractive index asymmetries of the active medium (parallel and perpendicular on the flow direction) are compensated. A 90 degree(s) deflection device is the main constructive element (this is built by two mirrors at 45 degree(s) relative angle and offers the pentaprism properties). This deflection device reverses the wavefront in one of the two discharge channel and in addition improved the resonator stability. The main results are (eta) m is congruent to 0.83 for NF is congruent to 1.9 and the beam pattern is independent of the power level in the range of 300 W to 1800 W.
提出了一种用于横向流动CO2激光器的新型光腔结构。对于强度分布为TEM00/01的激光束(对应于光腔菲涅耳数nf的低值)，得到匹配系数(激光束的横截面/放电的横截面)-(eta) m的高值。同时，两种类型的增益和折射率不对称的有源介质(平行和垂直的流动方向)进行补偿。一个90度(s)偏转装置是主要的构造元件(这是由两个镜子在45度(s)的相对角度，并提供五棱镜的性质)。该偏转装置使两个放电通道中的一个的波前发生反转，提高了谐振腔的稳定性。主要结果是(eta) m = 0.83, NF = 1.9，在300w ~ 1800w范围内，波束方向与功率无关。
{"title":"High-quality beam transversal gas transport cw CO2 laser","authors":"I. Gutu, V. R. Medianu, Petre Cristian","doi":"10.1117/12.312714","DOIUrl":"https://doi.org/10.1117/12.312714","url":null,"abstract":"A new optical resonator configuration for transverse flow CO2 laser was developed. A high value of the matching coefficient (the cross section of the laser beam/the cross section of the electrical discharge)-(eta) m, is obtained for laser beams with TEM00/01 intensity distribution (that corresponds to the low values of the Fresnel number-NF of the optical resonator). Simultaneously, both types of the gain and refractive index asymmetries of the active medium (parallel and perpendicular on the flow direction) are compensated. A 90 degree(s) deflection device is the main constructive element (this is built by two mirrors at 45 degree(s) relative angle and offers the pentaprism properties). This deflection device reverses the wavefront in one of the two discharge channel and in addition improved the resonator stability. The main results are (eta) m is congruent to 0.83 for NF is congruent to 1.9 and the beam pattern is independent of the power level in the range of 300 W to 1800 W.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134476435","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. Andriesh, S. A. Malkov, V. Verlan, M. G. Bulgaru
The Me-Amorphous chalcogenide semiconductor (AChS)--dielectric- semiconductor (Me - As2Se3: Sn - SiO2 - Si) (MChDS) structure was obtained. There have been found that under the lighting in electric field the MChDS in dependence from applied external direction of electric field positive or negative are charged. There were found that quantity of accumulated charge from light intensity have been depended linear type Q equals Qmax ((alpha) + (beta) D), where D--is the dose of radiation (D equals I t, where I is the intensity and t duration of radiation). There were studied and developed three different type of signal recording: by measuring of the photoempf, displacement photocurrent and accumulated charge, which allow to propose two type of sensors of radiation. The dose measuring and the image writing and readout processes in the real time and accumulation of the small signals regimes. The space functional separation of the recording and readout allows to carry out understroing repetition readout of the image and other operations.
{"title":"New type of sensor of radiation in a wide range of energy","authors":"A. Andriesh, S. A. Malkov, V. Verlan, M. G. Bulgaru","doi":"10.1117/12.312706","DOIUrl":"https://doi.org/10.1117/12.312706","url":null,"abstract":"The Me-Amorphous chalcogenide semiconductor (AChS)--dielectric- semiconductor (Me - As2Se3: Sn - SiO2 - Si) (MChDS) structure was obtained. There have been found that under the lighting in electric field the MChDS in dependence from applied external direction of electric field positive or negative are charged. There were found that quantity of accumulated charge from light intensity have been depended linear type Q equals Qmax ((alpha) + (beta) D), where D--is the dose of radiation (D equals I t, where I is the intensity and t duration of radiation). There were studied and developed three different type of signal recording: by measuring of the photoempf, displacement photocurrent and accumulated charge, which allow to propose two type of sensors of radiation. The dose measuring and the image writing and readout processes in the real time and accumulation of the small signals regimes. The space functional separation of the recording and readout allows to carry out understroing repetition readout of the image and other operations.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"3405 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131267439","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}
I. Radulescu, L. Radu, R. Serbanescu, V. Nelea, C. Martin, I. Mihăilescu
The damages of the complex of deoxyribonucleic acid (DNA) and proteins from chromatin, produced by the UV laser radiation and/or by treatment with a radiomimetic substance, bleomycin, were compared. The laser radiation and bleomycin effects on chromatin structure were determined by the static and dynamic fluorimetry of chromatin complexes with the DNA specific ligand-- proflavine and by the analysis of tryptophan chromatin intrinsic fluorescence. Time resolved spectroscopy is a sensitive technique which allows to determine the excited state lifetimes of chromatin--proflavine complexes. Also, the percentage contributions to the fluorescence of proflavine, bound and unbound to chromatin DNA, were evaluated. The damages produced by the UV laser radiation on chromatin are similar with those of radiomimetic substance action and consists in DNA and proteins destruction. The DNA damage degree has been determined. The obtained results may constitute some indications in the laser utilization in radiochimiotherapy.
{"title":"Comparison of the effect of UV laser radiation and of a radiomimetic substance on chromatin","authors":"I. Radulescu, L. Radu, R. Serbanescu, V. Nelea, C. Martin, I. Mihăilescu","doi":"10.1117/12.312650","DOIUrl":"https://doi.org/10.1117/12.312650","url":null,"abstract":"The damages of the complex of deoxyribonucleic acid (DNA) and proteins from chromatin, produced by the UV laser radiation and/or by treatment with a radiomimetic substance, bleomycin, were compared. The laser radiation and bleomycin effects on chromatin structure were determined by the static and dynamic fluorimetry of chromatin complexes with the DNA specific ligand-- proflavine and by the analysis of tryptophan chromatin intrinsic fluorescence. Time resolved spectroscopy is a sensitive technique which allows to determine the excited state lifetimes of chromatin--proflavine complexes. Also, the percentage contributions to the fluorescence of proflavine, bound and unbound to chromatin DNA, were evaluated. The damages produced by the UV laser radiation on chromatin are similar with those of radiomimetic substance action and consists in DNA and proteins destruction. The DNA damage degree has been determined. The obtained results may constitute some indications in the laser utilization in radiochimiotherapy.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124284113","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}
We present a new scheme of sub-Doppler laser cooling for atoms used in atomic frequency standards, particularly for 40Ca. We perform calculations concerning optical pumping via a velocity- selective state based upon velocity-selective coherent population trapping. Optical pumping on the Raman transition 41S0- 41P1-31D2 leads to population of the metastable singlet state followed by a decay into the metastable triplet state 4P1. The momentum distribution of atoms in that state (with a half-maximum width of about one corresponding photon recoil momentum) is a direct replica of the distribution of atoms in the 3D2 state.
{"title":"Optical pumping via a velocity-selective state","authors":"N. Leinfellner, L. Windholz, I. Mazets","doi":"10.1117/12.312805","DOIUrl":"https://doi.org/10.1117/12.312805","url":null,"abstract":"We present a new scheme of sub-Doppler laser cooling for atoms used in atomic frequency standards, particularly for 40Ca. We perform calculations concerning optical pumping via a velocity- selective state based upon velocity-selective coherent population trapping. Optical pumping on the Raman transition 41S0- 41P1-31D2 leads to population of the metastable singlet state followed by a decay into the metastable triplet state 4P1. The momentum distribution of atoms in that state (with a half-maximum width of about one corresponding photon recoil momentum) is a direct replica of the distribution of atoms in the 3D2 state.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117246723","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}
Some problems appeared during the production of induced transmission filters are analyzed in the case of some technological limits. One can reveal the dependence between the performances of induced transmission filters and production technological parameters. The experimental results are compared to those ones characteristic to other types of narrow band interference filters.
{"title":"Filters with induced transmission","authors":"Gheorghe Honciuc","doi":"10.1117/12.312734","DOIUrl":"https://doi.org/10.1117/12.312734","url":null,"abstract":"Some problems appeared during the production of induced transmission filters are analyzed in the case of some technological limits. One can reveal the dependence between the performances of induced transmission filters and production technological parameters. The experimental results are compared to those ones characteristic to other types of narrow band interference filters.","PeriodicalId":383583,"journal":{"name":"ROMOPTO International Conference on Micro- to Nano- Photonics III","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124397048","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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