Pub Date : 1998-09-14DOI: 10.1109/CLEOE.1998.719460
F. Beinhorn, J. Ihlemann
Polymethylmethacrylate (PMMA) doped with 0.25 wt% of 1,3-diphenyltriazen (DPT) was illuminated with single subablative excimer laser pulses of about 30 ns duration at 308 nm wavelength. Illumination of the polymer surface was earned out by 7:1 demagnifying mask projection using circular apertures. The resulting spotsize on the sample was varied between diameters of 10 and 300 µm. The fluence was varied between the onset of visible surface changes at about 400 mJ/cm2 and the beginning of single pulse mass removal at about 5 J/cm2.
{"title":"Micro Lens Arrays Generated by Ultraviolet Laser Irradiation of Doped Polymethylmethacrylate","authors":"F. Beinhorn, J. Ihlemann","doi":"10.1109/CLEOE.1998.719460","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719460","url":null,"abstract":"Polymethylmethacrylate (PMMA) doped with 0.25 wt% of 1,3-diphenyltriazen (DPT) was illuminated with single subablative excimer laser pulses of about 30 ns duration at 308 nm wavelength. Illumination of the polymer surface was earned out by 7:1 demagnifying mask projection using circular apertures. The resulting spotsize on the sample was varied between diameters of 10 and 300 µm. The fluence was varied between the onset of visible surface changes at about 400 mJ/cm2 and the beginning of single pulse mass removal at about 5 J/cm2.","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126101908","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719232
S. Saltiel, K. Koynov, M. Fejer
The combination of two novel techniques second order cascading [1] and quasi phase matching [2] (QPM) can yield to solutions for construction small, low power operated, all-optical switching devices. Important parameters in this devices are the switching intensities Iπ/2 and Iπ necessary for obtaining nonlinear phase shift (NPS) with amount of π or π/2, correspondingly. Here we show that one way to reduce the parameters Iπ/2and Iπ is to use aperiodic quasi-phase matched structure. We investigated the NPS obtained by the fundamental beam involved in the process of second harmonic generation in second order material for which the normalized phase mismatch satisfy where ki=2πni/λi (i=ω,2ω), p is a coefficient and Kgrat(z) = 2π/Λgrat(z) with Λgrat being the grating period.
{"title":"Aperiodic Quasi-Phase-Matching as a Method to Reduce Switching Intensity in Devices Based on Second Order Cascading","authors":"S. Saltiel, K. Koynov, M. Fejer","doi":"10.1109/CLEOE.1998.719232","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719232","url":null,"abstract":"The combination of two novel techniques second order cascading [1] and quasi phase matching [2] (QPM) can yield to solutions for construction small, low power operated, all-optical switching devices. Important parameters in this devices are the switching intensities Iπ/2 and Iπ necessary for obtaining nonlinear phase shift (NPS) with amount of π or π/2, correspondingly. Here we show that one way to reduce the parameters Iπ/2and Iπ is to use aperiodic quasi-phase matched structure. We investigated the NPS obtained by the fundamental beam involved in the process of second harmonic generation in second order material for which the normalized phase mismatch satisfy where ki=2πni/λi (i=ω,2ω), p is a coefficient and Kgrat(z) = 2π/Λgrat(z) with Λgrat being the grating period.","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123266411","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719560
T. Graf, U. Roth, J. Balmer, H. Weber
Free-space coherent communications systems require high efficiencies, output powers of about 1 W or more, and a phase modulation bandwidth of at least 1 GHz. Furthermore, spaceborne applications should exhibit exceptional ruggedness while maintaining a small package and simple thermal management. We present three different variants of a novel diode laser-pumped Nd:YAG amplifier that was designed to amplify the phase modulated beam of intersatellite optical links. The amplification, saturation, and noise properties as well as the thermally induced distortions are discussed.
{"title":"Compct Nd:YAG Optical Amplifier for Intersatellite Coherent Communication","authors":"T. Graf, U. Roth, J. Balmer, H. Weber","doi":"10.1109/CLEOE.1998.719560","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719560","url":null,"abstract":"Free-space coherent communications systems require high efficiencies, output powers of about 1 W or more, and a phase modulation bandwidth of at least 1 GHz. Furthermore, spaceborne applications should exhibit exceptional ruggedness while maintaining a small package and simple thermal management. We present three different variants of a novel diode laser-pumped Nd:YAG amplifier that was designed to amplify the phase modulated beam of intersatellite optical links. The amplification, saturation, and noise properties as well as the thermally induced distortions are discussed.","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123733978","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719118
A. Vickers, H. Mashayekhi
{"title":"Theoretical and Experimental Studies of Back-Grated Metal-Semiconductor-Metal Photodetectors","authors":"A. Vickers, H. Mashayekhi","doi":"10.1109/CLEOE.1998.719118","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719118","url":null,"abstract":"","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125311392","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719144
F. D’Amato, M. De Rosa, C. Corsi, G. Modugno, M. Inguscio
In several industrial processes there is a growing demand for a fast and sensitive detection of HCl, in order to reduce the pollution due to that molecule. We realized a compact spectrometer based on distributed feed-back (DFB) diode laser, which adopts a two-tone frequency modulation technique, for reaching a detection limit of few ppb. This technique moves the demodulation frequency in a region where the laser excess noise can be reduced to a lower level (10 MHz - 1 GHz).
{"title":"Detection of HCI at the ppb Level with a DFB Laser Based Spectrometer","authors":"F. D’Amato, M. De Rosa, C. Corsi, G. Modugno, M. Inguscio","doi":"10.1109/CLEOE.1998.719144","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719144","url":null,"abstract":"In several industrial processes there is a growing demand for a fast and sensitive detection of HCl, in order to reduce the pollution due to that molecule. We realized a compact spectrometer based on distributed feed-back (DFB) diode laser, which adopts a two-tone frequency modulation technique, for reaching a detection limit of few ppb. This technique moves the demodulation frequency in a region where the laser excess noise can be reduced to a lower level (10 MHz - 1 GHz).","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125390903","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719287
R. Koch, T. Schroder, U. Stamm, W. Zschocke, D. Basting
We have demonstrated significant extension of the pulse repetition frequency (PRF) operation regime of a diode-bar-pumped Nd:YAG laser towards higher PRF. The laser is an electro-optic Q-switched Nd:YAG laser with stable resonator It is side-pumped by pulsed laser diodes with a duty cycle in the order of 20 %. Earlier we have demonstrated that the PRF can be continuously adjusted over an enormous range from 1 Hz to 1 kHz At 1 kHz, typically an output power of 10 W is generated, corresponding to a single pulse energy of 10 mJ [1]. The pulse duration in the fundamental wave is about 12 ns. Combined with a near-diffraction limited beam quality (M2 < 1.1), this high intensity allows external harmonic generation with high efficiency. Typical values at 1 kHz are an average power of 6.5 W at 532 nm, 4.5 W at 355 nm, 2.8 W at 266 nm, and 1 W at 213 nm in the 5HG [2].
{"title":"High Average Power, High Pulse Repetition Frequency Diode Pumped UV Solid-State Laser System","authors":"R. Koch, T. Schroder, U. Stamm, W. Zschocke, D. Basting","doi":"10.1109/CLEOE.1998.719287","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719287","url":null,"abstract":"We have demonstrated significant extension of the pulse repetition frequency (PRF) operation regime of a diode-bar-pumped Nd:YAG laser towards higher PRF. The laser is an electro-optic Q-switched Nd:YAG laser with stable resonator It is side-pumped by pulsed laser diodes with a duty cycle in the order of 20 %. Earlier we have demonstrated that the PRF can be continuously adjusted over an enormous range from 1 Hz to 1 kHz At 1 kHz, typically an output power of 10 W is generated, corresponding to a single pulse energy of 10 mJ [1]. The pulse duration in the fundamental wave is about 12 ns. Combined with a near-diffraction limited beam quality (M2 < 1.1), this high intensity allows external harmonic generation with high efficiency. Typical values at 1 kHz are an average power of 6.5 W at 532 nm, 4.5 W at 355 nm, 2.8 W at 266 nm, and 1 W at 213 nm in the 5HG [2].","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126632765","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719457
R. Oltra, E. Arenholz, P. Leiderer, W. Kautek, C. Fotakis, M. Autric, N. Afonso, P. Maine
This TMR programme ((ERBFMRXCT980188) aims to study the fundamental physical and chemical aspects of pulsed laser-solid interactions leading to any form of surface cleaning in order to develop the laser cleaning technique as a reliable industrial production tool.
{"title":"Modelling and Diagnostic of Pulsed Laser-Solid Interactions Applications to Laser Cleaning: a TMR Programme","authors":"R. Oltra, E. Arenholz, P. Leiderer, W. Kautek, C. Fotakis, M. Autric, N. Afonso, P. Maine","doi":"10.1109/CLEOE.1998.719457","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719457","url":null,"abstract":"This TMR programme ((ERBFMRXCT980188) aims to study the fundamental physical and chemical aspects of pulsed laser-solid interactions leading to any form of surface cleaning in order to develop the laser cleaning technique as a reliable industrial production tool.","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115250964","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719075
C. Bellecci, P. Gaudio, M. Valentini, S. Martelluci
C. Bellemi. P. Gaudio, M. Valentini INFM Dcpamncnr of Physics, Univeniw of Calabria, 87036 Arcavacata di Rsndc (CS); tel.: -39 984 401741: fax t i 3 9 984 401660 s-mail: hsl lecssi~or.uniraI. i l S. Martellucci INFM STFE Dcpamncnfunivosity o f R,701 Vergal’. 00133 Rome: el.: +39612597144, fax: +t3?6 7 2 5 9 7 I 4 S : o m d l r m ~ v r m . i l P. Avma, G. Caputi, F. De Donato R. Zoccali CRATl ~ . ~ . r . l . u o Depamnmr ofPhyncr, univenily ofCrlaMa, 81036 AICBYBCBI~ di Rende (CS); Lel.:++?9984838053 -83t052;fax:+b39984401660
{"title":"TEA CO/sub 2/ Dial Station for Atmospheric Water and Pollutants Measurements","authors":"C. Bellecci, P. Gaudio, M. Valentini, S. Martelluci","doi":"10.1109/CLEOE.1998.719075","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719075","url":null,"abstract":"C. Bellemi. P. Gaudio, M. Valentini INFM Dcpamncnr of Physics, Univeniw of Calabria, 87036 Arcavacata di Rsndc (CS); tel.: -39 984 401741: fax t i 3 9 984 401660 s-mail: hsl lecssi~or.uniraI. i l S. Martellucci INFM STFE Dcpamncnfunivosity o f R,701 Vergal’. 00133 Rome: el.: +39612597144, fax: +t3?6 7 2 5 9 7 I 4 S : o m d l r m ~ v r m . i l P. Avma, G. Caputi, F. De Donato R. Zoccali CRATl ~ . ~ . r . l . u o Depamnmr ofPhyncr, univenily ofCrlaMa, 81036 AICBYBCBI~ di Rende (CS); Lel.:++?9984838053 -83t052;fax:+b39984401660","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116453147","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719112
I. Klimov, J. Bartschke, K. Boller, V. Tsvetkov, I. Shcherbakov, R. Wallenstein
Excellent output parameters of Cr4+-passively Q-switched diode pumped Nd-lasers causes strong interest to these system as laser sources for the consequent nonlinear frequency conversion through external harmonics generation or through pumping the optical parametric oscillators [1]. Mode-selection property is quite common for passive Q-switching technique and can by explained by means of strong gain difference between adjacent modes during multipass build up of the pulse. However, the polarization features of the Cr4+ :crystals-Q-switched lasers are determinated mainly by polarization anisotropy of the Cr4+-saturable absorption and it’s interaction with resonator polarization inhomogeneity.
{"title":"Polarization Properties of the Diode-Pumped Nd:Lasers Passively Q-Switched with Cr/sup 4+/: Saturable Absorbers","authors":"I. Klimov, J. Bartschke, K. Boller, V. Tsvetkov, I. Shcherbakov, R. Wallenstein","doi":"10.1109/CLEOE.1998.719112","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719112","url":null,"abstract":"Excellent output parameters of Cr4+-passively Q-switched diode pumped Nd-lasers causes strong interest to these system as laser sources for the consequent nonlinear frequency conversion through external harmonics generation or through pumping the optical parametric oscillators [1]. Mode-selection property is quite common for passive Q-switching technique and can by explained by means of strong gain difference between adjacent modes during multipass build up of the pulse. However, the polarization features of the Cr4+ :crystals-Q-switched lasers are determinated mainly by polarization anisotropy of the Cr4+-saturable absorption and it’s interaction with resonator polarization inhomogeneity.","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122641825","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 : 1998-09-14DOI: 10.1109/CLEOE.1998.719012
N. Zhavoronkov, V. Mikhailov
The pump power absorbed in the solid-state laser crystals gives rise to thermal loading effect owing to the temperature dependence of the refractive index n l . Because of this the characteristics of the laser can be drastically changed, so this effect is important to design efficient laser system. The temterature distribution T(r,z) inside the laser od in the steady state satisfies a well-know differential equation and the resulting thermal variation of n l can be analytically evaluated in terms of the exponential integrals [1]:
{"title":"An Influence of Thermal Lensing on the Laser Operaton in Chromium-Doped Forsterite at Room Temperature","authors":"N. Zhavoronkov, V. Mikhailov","doi":"10.1109/CLEOE.1998.719012","DOIUrl":"https://doi.org/10.1109/CLEOE.1998.719012","url":null,"abstract":"The pump power absorbed in the solid-state laser crystals gives rise to thermal loading effect owing to the temperature dependence of the refractive index n\u0000 l\u0000 . Because of this the characteristics of the laser can be drastically changed, so this effect is important to design efficient laser system. The temterature distribution T(r,z) inside the laser od in the steady state satisfies a well-know differential equation and the resulting thermal variation of n\u0000 l\u0000 can be analytically evaluated in terms of the exponential integrals [1]:","PeriodicalId":404067,"journal":{"name":"CLEO/Europe Conference on Lasers and Electro-Optics","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122681713","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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