1994 Conference on Lasers and Electro-Optics Europe最新文献

{"title":"Laser physics of Nd3+-doped phosphate glasses","authors":"S. Payne, C. Bibeau, J. S. Hayden","doi":"10.1364/cleo_europe.1994.cfc1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cfc1","url":null,"abstract":"Nd-doped glasses have emerged as one of a handful of laser materials that are routinely employed in scientific and commercial applications. As a consequence, it is of interest to have access to a comprehensive evaluation of the crucial laser parameters. In this paper we present new information on the mechanisms that impact the pumping efficiency (concentration quenching and Auger upconversion) and the extraction process (4I11/2 terminal level lifetime and hole burning). Most of our results concern phosphate glasses, although fluorides and silicates are addressed as well. The relevant processes are illustrated in Fig. 1.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"59 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131858705","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":"Progress in high-power femtosecond excimer lasers","authors":"S. Szatmäri","doi":"10.1364/cleo_europe.1994.jtha1","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.jtha1","url":null,"abstract":"In view of the recent advances in femtosecond solid-state technology, highpower solid-state laser systems are regarded as superior light sources over excimer-based short-wavelength systems. Based on the well-developed high-energy amplifier technology and using the so-called Chirped-Pulse-Amplification (CPA) technique, peak powers of several tens of TW have been reached.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370609","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":"Nd3+ laser oscillation in fluoride crystals at 1.3-μm short wavelength wing of 4F3/2-4I13/2 transition","authors":"V. B. Sigachev, T. Basiev, M. Doroshenko, V. Osiko, A. Papashvili","doi":"10.1364/cleo_europe.1994.cfc8","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cfc8","url":null,"abstract":"Nd3+-doped laser media providing gain in (1.30 ± 0.02) μm spectral region can be a potential active materials for optical amplifiers suitable for fiber-optical communication systems. Usually this spectral region corresponds to short wavelength boundary of 4F3/2−4I13/2 emission of Nd3+ ions. But the positive gain here can be suppressed because of the excited-state absorption (ESA) at the 4F3/2–4G7/2 transition. In this paper we report on the spectroscopic and laser study of a number of Nd3+ doped fluoride crystals with disordered structure in the 1.3-μm wave length region. The most promising crystalline fluorides with small ESA and positive gain in 1.3-μm telecommunication window were identified.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132992849","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 and numerical investigation of short pulse amplification in the 1.3µm region","authors":"H. Ammann, W. Hodel, H. Weber","doi":"10.1364/cleo_europe.1994.ctuk10","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctuk10","url":null,"abstract":"Short pulse amplification has been widely investigated down to the sub-100 fs regime in the third telecommunications window around 1.55µm. Amplification in the important 1.3µm telecommunications band has recently attracted much attention, whereby Pr -doped fluoride fibre amplifiers (PDFAs) with gains up to 38.2 dB have been reported. However, investigation of pulse propagation in active fluoride fibres and demonstration of short pulse amplification has not been demonstrated.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133240610","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":"Beam fanning and self-starting oscillation in photorefractive InP:Fe at 1.06 μm","authors":"Y. Ding, R. Röpnack, H. Eichler","doi":"10.1364/cleo_europe.1994.ctuh2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctuh2","url":null,"abstract":"Light-induced refractive index changes in photorefractive semiconductors have become comparable with those in the photorefractive oxides with the help of electric field enhancement, resonance excitation as well as exploitation of the electrorefraction. The two-wave mixing gain coefficient in InP has reached the values higher than 30 cm-1 at 970 nm.1 As a benefit from such strong beam couplings self-organization effects like beam fanning, photorefractive oscillation, double-phase conjugation, and self-pumped phase conjugation can be achieved in semiconductors. In this presentation we report the experimental investigation on such self-starting (or self-organization) effects in InP:Fe at 1.06 μm with an applied dc-electric field.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133363098","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":"Potential of autodyne lidars for study of the atmosphere","authors":"E. Gordov","doi":"10.1364/cleo_europe.1994.cfd4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cfd4","url":null,"abstract":"Nowaday usage of laser autodyning, i.e., usage of a laser as a transmitter of probing signal and as the receiver of its frequency shifted echo, is quite attractive area for the lidar community (see, for example, Ref. 1). Such an approach to laser sensing of the atmosphere looks very beneficial since information on atmospheric path losses and on retroreflector (mirror, topographic targets, aerosol) properties is retrieved from characteristics of the laser intracavity field. As a result of intraresonator mixing, the following positives take place: (1) high noise immunity; (2) enhanced sensitivity quite comparable with those achieved at heterodyning; (3) possibility to neglect by short noise of a photodetector; (4) simple lidar design since the same optical path is used for the probing signal and its echo; (5) absence of local oscillator, hence robustness and self-alignness of the lidars; (6) possibility to retrieve a set of optical and dynamic characteristics of the distant retrorflector and atmospheric path from signal measurement.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128885838","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":"Laser-based metrology applications and principles of dynamic focusing","authors":"A. Brown","doi":"10.1364/cleo_europe.1994.ctui4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.ctui4","url":null,"abstract":"Summary not available.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129154150","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 growth and studies of photorefractive Bi12TiO20 single crystals","authors":"V. Prokofiev, A. Kamshilin, Timo Jääskäläinen","doi":"10.1364/cleo_europe.1994.cwf43","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cwf43","url":null,"abstract":"Photorefractive crystals of the sillenites (Bi12GeO20, Bi12SiO20, Bi12TiO20) have the promising applications in optical information processing, including spatial light modulators, optical memories, phase conjugation, image inversion, and optical interconnects.1 In comparison to other sillenities, bismuth titanium oxide (Bi12TiO20, BTO) exhibits a higher sensitivity for red lights that permit the use of a cheap HeNe laser. In addition, BTO crystals have a lower optical activity ρ, which is favourable for many applications. However, some technological problems (the incongruent melting of Bi12TiO20, the high tendency of Bi2O3-containing melts to the supercooling, etc.) created difficulties for producing large single crystals of high optical quality.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127683130","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":"Optical phase conjugation in the short-time range: Generation of sub-nanosecond laser pulses with Q-switching by stimulated Brillouin scattering (SBS)","authors":"M. Kramer, V. Brückner","doi":"10.1364/cleo_europe.1994.cmc4","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cmc4","url":null,"abstract":"We studied Q-switch1,2 of a pulsed Nd: YAG laser using the phase-conjugating properties of stimulated Brillouin scattering (SBS) inside the laser cavity. The laser cavity (see Fig. 1) consists of a flashlamp-pumped Nd:YAG rod as the active medium and a conventional two-mirror arrangement (M1, M2) with a SBS-cell containing acetone surrounded by two lenses (L1, L2). Caused by a non-confocal setup of the lenses, one can achieve high geometrical losses (per round trip) of the laser radiation emitted from the Nd:YAG rod. The low feedback between the resonator and the active medium continues as long as the intensity in focal point F inside the SBS-cell is below threshold for SBS. Thus a high inversion population is built up in the Nd:YAG rod during the increase of the flashlamp intensity. At high intensities of the laser wave-phase-conjugated backward scattering starts from F in the liquid switching the resonator quickly from high to low losses (Q-switching). As a result a short laser pulse is generated, which has—caused by the non-confocal setup—a measurable focal point outside the cavity. Depending on the relation between gain of the Nd:YAG rod, SBS reflectivity of the acetone and light intensity we found one, two, or three pulses of 2–3 ns duration with 10 mJ energy each, separated by the round-trip time between outcoupling mirror M2 and SBS scattering point F. These results can be explained qualitatively in the scope of ABCD-matrix theory and Gaussian beam propagation. Numerical calculations of the beam propagation permit to draw conclusions concerning the existence of a focal point and the \"prehistory\" of the phase-conjugated pulses. Even if starting 0.1 μm apart from the optical axis, a laser beam will exceed the cross section of the Nd:YAG rod (7-mm diameter) in 10 round trips only, which is equivalent to high geometrical losses of the laser wave in the resonator and a short \"prehistory.\" Indeed, the laser pulse appeared 80 μs after the peak of the pump pulse (FWHM 500 μs). By changing the oscillator configuration (resonator length, position, and focal length of lenses), we achieved pulse peaks with 100 ps duration on top of a broader background pulses (signal to background up to 10:1). By using a saturable absorber outside the laser resonator, the background was suppressed and up to 1 mJ pulse energy left. The sub-nanosecond pulses were recorded with a streak camera at the second harmonic (see Fig. 2). These pulses appeared 100 μs before the peak of the flash lamp intensity. As explanations for the highly reduced pulse lengths of the output pulses optical breakdown by generation of a plasma in focal point F, mode-locking by multiple reflection between M2 and F and pulse shortening by oscillation of the reflection point F in the SBS-cell will be discussed.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117137848","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 multicomponent air pollutant photoacoustic gas analysis using a cw 13CO2-laser","authors":"V. Kulikov, V. Starovoitov","doi":"10.1364/cleo_europe.1994.cwf2","DOIUrl":"https://doi.org/10.1364/cleo_europe.1994.cwf2","url":null,"abstract":"In the last few years, the photoacoustic spectroscopy with using CO2-lasers has proved promising for local air pollution monitoring. The application of rare isotope carbon dioxide species lasers permits to both reduce the absorption background caused by the atmospheric CO2 and increase the number of substances to be detected. The use of 13CO2 specie in active medium of an exciting laser makes it possible to determine the concentrations of substances, absorbing the radiation in the range of 9.6-10.2 and 10.6–11.4 μm.","PeriodicalId":276336,"journal":{"name":"1994 Conference on Lasers and Electro-Optics Europe","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115871176","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}