CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics最新文献

{"title":"Focus adjustment-free imaging over a long range","authors":"Shu Wing Li, T. Aruga","doi":"10.1109/CLEO.1997.602450","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602450","url":null,"abstract":"Abstract Focus adjustment-free imaging over a long range is demonstrated, both theoretically and experimentally, by using a simple telescopic system of the Galilean type that has an eyepiece with specified spherical aberration. Computer simulation results show that such a telescopic system with a 5 cm aperture can form clear images of a target over a range from 60 to ∼400 m, without focusing adjustment. The imaging results of an experiment carried out using such a telescopic system confirm that clear images can indeed be obtained in this range without focusing adjustment, verifying the usefulness of the new technique.","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"120 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114026451","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":"Self-switching fiber loops imbalance by fiber dispersion","authors":"W. Wong, Mordehai Margalit, S. Namiki, S. Longhi, E. Ippen, H. Haus","doi":"10.1109/CLEO.1997.602290","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602290","url":null,"abstract":"Using stimulated Brillouin scattering (SBS) in glass fibers as phase-conjugating process, the field of application of SBS phase conjugators' can be expanded, because fibers offer a lowpower threshold and a stable performance even at high input energies in contrast to liquid and gas SBS phase conjugators. Undoped multimode quartz fibers with a core diameter of 200 pm were tested as phase conjugators with high fidelity and reflectivity for 1064-nm wavelength in Ref. 2. Only the first two meters of a fiber contribute constructively to the stimulated Brillouin scattering process for input pulses with a coherence length of about 50 cm, so that attenuation in the fiber plays only a secondary role. Therefore, fibers with higher attenuation at shorter wavelengths can be still used as phase conjugators. We present results of fiber phase conjugators at three wavelengths from near-infrared 1.06 pm over visible 532 nm to nearultraviolet 355 nm. The SBS threshold, reflectivity and fidelity were characterized. Commercial all-silica multimode quartz glass fibers with a step-index structure, a core diameter of 100 pm and a cladding diameter of 110 pm were used. The core is made from undoped quartz glass. The numerical aperture NA is 0.22, which corresponds to a maximum full angle of 25.4' (-440 mrad) for coupling light into the fiber. The lengths of all investigated fibers were more than 2 m. The attenuation of the used fibers is about 2 dB/km at 1064 nm, 30 dB/km at 532 nm and 45 dB/km at 355 nm. At a fiber length of 2 meters, losses of about 0.2% at 1064 nm, 3% at 532 nm and 4% at 355 nm are expected for a pulse traveling forth and back the fiber. Figure 1 shows the experimental setup for our investigations. A NdYAG oscillator-","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114805506","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-induced microstructuring of dielectrics using ultrashort laser pulses","authors":"D. Ashkenasi, A. Rosenfeld, H. Varel, E. Campbell","doi":"10.1109/CLEO.1997.602398","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602398","url":null,"abstract":"be explained by the electron heat conduction. Variations of the laser pulse duration indicate that the regime determined by the optical penetration depth, where the highest precision can be achieved and the heat affected zones are minimized, is only accessible with subpicosecond pulses. The application of this technique for the microstructuring of metals will be discussed (see Fig. 2). This work was supported by the German Ministry of Science, Education, Research and Technology (BMBF, 13N6590/0). 1. W. Kautek, J. Kriiger, SPIE Proc. 2207,600 (1994). 2. S. Preuss, A. Demchuk, M. Stuke, Appl. Phys. A 61,33 (1995). 3. B. N. Chichkov, C. Momma, S. Nolte, F. von Alvensleben, A. Tiinnermann, Appl. Phys. A 63,109 (1996). C. Momma etal., Opt. Commun. 129,134 (1996). 4.","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127696483","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":"Evaluation of photorefractive holographic imaging through turbid media","authors":"N. Barry, R. Jones, S. Hyde, J. Dainty, P. French, S. Trivedi, E. Dieguez","doi":"10.1109/CLEO.1997.602211","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602211","url":null,"abstract":"We are pursuing high spatial resolution confocal imaging of reflected NIR light as a diagnostic tool. To determine the efficacy of confocal imaging for in vivo pathology, it is critical to know the maximum thickness of scattering tissue through which biological signals can be detected. This limit depends on three factors: the fraction of signal photons generated in the focal region, the attenuation of the light to and from the focal region, and the background signal generated outside the focal region. Previous measurements of this limit used signals from a mirror,l which are much stronger than those expected from biological sources. Our previous Monte Carlo simulations* found that the greatest sources of contrast in reflection confocal imaging are changes in the index of refraction. For the index mismatches found in cells (-0.05),3 using a system NA of 0.4 we estimated these changes could be detected through 2-3 optical depths (ODs) of scattering. In this work, we have measured the maximum depth in ODs at which physiologic index mismatches can be detected. A confocal reflectometer was constructed (NA = 0.8) as shown in Fig. l a with an axial resolution of 4 pm. Two types of samples were investigated: 1) background was measured from homogenous scattering samples and 2) signal plus background was measured from scattering samples containing a planar index mismatch located at variable depths. Scattering was generated by 1-pm diameter latex microspheres. Scattering coefficients were calculated using Mie theory. The background was assessed by translating optically thick samples of scattering gelatin through the focus of the objective while recording the detected signal as function of position. The measured background scans from samples with three different scattering coefficients are plotted in Fig. 2a as a function of optical depth, where OD = (pJ (Depth.) An exponential fit to the background data indicates that each is decaying at eCoD. The initial amplitude of the background signal (B,) is directly proportional to the scattering coefficient (Fig. 2b). These data suggest that the background signal is produced by photons initially scattered outside the focal volume. Confocal signals from inhomogeneous scattering samples were measured by scanning a layered phantom with known optical properties (Fig. Ib). An index mismatch of 0.05 or 0.1 between the scattering gelatin and the scattering index fluid (IF) was used as a signal source at variable OD. The appropriate background was subtracted from each measure(b)","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126502064","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":"Locking properties of self-pulsating lasers under optical injection","authors":"G. Pham, G. Duan","doi":"10.1109/CLEO.1997.603067","DOIUrl":"https://doi.org/10.1109/CLEO.1997.603067","url":null,"abstract":"","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126545382","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":"A short 10 W cw neodymium-doped M-profile fiber laser","authors":"P. Glas, M. Naumann, A. Schirrmacher, S. Unger, T. Pertsch","doi":"10.1109/CLEO.1997.602273","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602273","url":null,"abstract":"were determined to be 1.530 and 1.000 pm, respectively. Figure 1 depicts the variation of the internal gain with output signal power. Figure 2 illustrates how the noise factor varies with the output signal power. The optimum length for the waveguide amplifier was 6 mm. Figure 3 shows the variation of the internal gain and noise factor with the pump power for the 6-mm-long waveguide. A record internal gain of 19.5 dB with 50-mW pump power (18 mW injected in the waveguide) was achieved in the 6-mm-long waveguide. This is much higher than the previously reported gain in silver ion-exchanged waveguide.'J We attribute the improvement to the low propagation losses in our waveguide and the use of optimum waveguide length. Themistry Department, McGill University, Montreal, Quebec, H3A 2K6, Canada","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122284018","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":"A new model for the polarization bistability in ridge-waveguide lnGaAsP/lnP lasers","authors":"A. Richter, C. Lienau, T. Elsaesser, A. Klehr","doi":"10.1109/CLEO.1997.602394","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602394","url":null,"abstract":"","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121441200","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":"Fourth-order dispersion compensation using mismatched grating pairs","authors":"J. Squier, C. Barty, S. Kane, F. Salin, C. Le Blanc","doi":"10.1109/CLEO.1997.602205","DOIUrl":"https://doi.org/10.1109/CLEO.1997.602205","url":null,"abstract":"1. J. Zhou, G. Taft, C. P. Huang,M. M. Murnane, H. C. Kapteyn, I. P. Christov, Opt. Lett. 19, 1149 (1994). A. Stingl, M. Lenzner, Ch. Spielmann, F. Krausz, R. Szipocs, Opt. Lett. 20, 602 (1995). Ch. Spielmann, P. F. Curley, T. Brabec, F. Krausz, IEEE J. Quantum Electron. 30, 1100 (1994). 4. S. Backus, M. T. Asaki, C. Shi, H. C. Kapteyn, M. M. Murnane, Opt. Lett. 19, 399 (1994). S. H. Ashworth, M. Joschko, M. Woerner, E. Riedle, T. Elsaesser, Opt. Lett. 20, 2120 (1995). 2.","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121453143","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":"Electro-optic study of the bandstructure of lnGaAs laser materia","authors":"A. Jaeger, G. Weiser","doi":"10.1109/CLEO.1997.603099","DOIUrl":"https://doi.org/10.1109/CLEO.1997.603099","url":null,"abstract":"CWF44 Fig. 2 Experimental and calculated reflectances of the same aluminum oxide/ titanium oxide multilayer as that in Fig. 1 as a function of incident angle. monochromatized synchrotron radiation from the heamline 5B of the 750-MeV electron storage ring located at the Ultraviolet Synchrotron Radiation Facility (UVSOR), Institute for Molecular Science, Okazaki, Japan. The calculated reflectances (dashed curve) also show almost the same reflectances around 32% as the experimental ones. The full width of the half maximum of the experimental reflectances at 2.734 nm is 0.0381 nm, corresponding to A M = 0.0139. Figure 2 shows experimental plots and the calculated curve of the dependence of reflectances of the same aluminum oxidekitanium oxide multilayer as that in Fig. 1 on incident angle of the soft-X ray. The experimental plots agree well with the calculation. Full width of the half maximum of the reflectance at 71.8'is about 1.0'. *Department of Electrical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa223, Japan 1. T. W. Barhee, Jr., S. Morowka, M. C. Hettrick, Appl. Opt. 24,883 (1985). 2. H. Kumagai, M. Matsumoto, Y. Kawamura, K. Toyoda, M. Obara, Jpn. J. Appl. Phys. 33,7086 (1994). H. Kumagai, K. Toyoda, M. Matsumoto, M. Obara, Jpn. J. Appl. Phys. 32, 6137 (1993). H. Kumagai, K. Toyoda, Appl. Surf. Sci. 82/83,481 (1994). H. Kumagai, M. Matsumoto, K. Toyoda, M. Obara, M. Suzuki, Thin Solid Films 263,47 (1995). 3.","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115975867","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":"Abnormal transient wavelength-chirping dynamics in quantum-well-box distributed feedback lasers","authors":"Jian Wang, U. Griesinger, H. Schweizer","doi":"10.1109/CLEO.1997.603064","DOIUrl":"https://doi.org/10.1109/CLEO.1997.603064","url":null,"abstract":"ring. Referring to Fig. l a , in region 1 no guided mode exists; in region 2 a guided mode can exist in the disk; in region 3 guided modes can exist in both the diskand the ring (see Fig. lb), and thus a resonant coupling may occur; in region 4 guided modes can exist only in the ring. As the radii of the disk and ring decreases, for achieving resonant coupling, the ring should be thinner and closer to the disk, which results in a strong coupling. Under a certain radius, no coupling can exist at all. For disk radius smaller than about 0.4 * A, weak coupling is impossible. This also implies that a mode with less than 10 azimuthal lobes cannot be weakly coupled to a surrounding ring. For a given radius, the number of rings that can be coupled is limited. Figure 2 demonstrates the weak-resonantCWF18 Fig. 3 Experimental photographs of whispering gallery mode in a disk (a), a ring (b) and a system of a disk and a ring.","PeriodicalId":173652,"journal":{"name":"CLEO '97., Summaries of Papers Presented at the Conference on Lasers and Electro-Optics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131368644","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}