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BrowseConferences >Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)
Volume 3 -1999
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CLEO/Pacific Rim '99 [front matter]
Recent progress on silica-based planar lightwave circuit technology
Publication Year: 1999,Page(s):583 - 584 vol.3
Cited by: Papers (1)
Optical wavelength division multiplexing (WDM) networks are being studied with a view to enlarging transmission capacity and improving network flexibility. Silica-based planar lightwave circuits (PLCs) can provide various key practical components for these systems because they are suitable for large-scale integration, can be mass produced and offer long-term stability. This paper reviews recent wo...Show More
Wavelength division multiplexing (WDM) systems are widely deployed in high-capacity long-haul transmission systems. They can provide cost-effective additional capacity on fibers overloaded by the increase in data traffic. Current WDM systems are used mainly for point-to-point transmission links. Next generation WDM technologies are expected to provide full functionality at both the system and netw...Show More
Multiple waveguide-fiber connector for PLC modules for optical circuit board integration
Publication Year: 1999,Page(s):587 - 588 vol.3
Cited by: Papers (1)
In contrast to conventional optical modules with fiber pigtails, receptacle type optical modules can make it possible to package optical components economically on a printed circuit board. We have recently developed a duplex waveguide-fiber connector called the planar lightwave circuit (PLC) connector which utilizes a physical contact (PC) connection between optical waveguides and bare fibers. We ...Show More
The use of planar silica waveguide technology in quantum cryptography systems
Publication Year: 1999,Page(s):589 - 590 vol.3
Cited by: Papers (1)
Planar silica interferometers are used in a quantum cryptography system for the first time and demonstrate the feasibility of an integrated optic approach to secure key transmission. The integrated interferometers offer performance which is comparable to that obtained using similar all fibre systems.Show More
Stability analysis of dispersion-managed solitons controlled by synchronous amplitude modulators
Publication Year: 1999,Page(s):591 - 592 vol.3
We analyze stability of dispersion-managed (DM) solitons controlled by synchronous amplitude modulators. We show that the modulator can stabilize the energy of the DM soliton without simultaneous use of narrowband filters when the pulse energy is sufficiently large. We find that the modulators have to be inserted at locations where the pulse has negative chirp in order to stabilize its frequency a...Show More
Influence of dispersion map on 3-ps pulse transmission in an 80-km dispersion-managed fiber link
Publication Year: 1999,Page(s):593 - 594 vol.3
Cited by: Papers (1)
We have transmitted an unchirped 3-ps pulse over an 80-km strongly dispersion-managed link, whose dispersion map is designed so that the eigen-soliton solution is unchirped at the input end of each dispersion-managed period. For an improper dispersion map, however, the pulse expands itself instead of reforming into the soliton solution.Show More
Mode converter for broadband dispersion compensation
Publication Year: 1999,Page(s):595 - 596 vol.3
Cited by: Papers (1)
We have shown that the flatness of a wide band mode converter using tilted fiber Bragg grating can be optimized with fiber parameters namely the core radius. Insertion loss due to mode converter is also computed.Show More
Demonstration of the formalistic equivalence of the JME and Poincare sphere techniques for polarization mode dispersion measurement: is there really only one polarimetric PMD measurement method?
Publication Year: 1999,Page(s):597 - 598 vol.3
Cited by: Papers (1)
We have shown the formalistic equivalence between the Jones matrix eigenanalysis (JME) and Poincare sphere methods (which we propose should more logically be renamed as dispersion vector analysis (DVA)), both in the form of their associated equations of motion, but also in their robustness to the finite wavelength steps which are inevitably used in realistic measurements. In particular, for the ca...Show More
Dispersion measurement of a short length optical fiber using Fourier transform spectroscopy
Publication Year: 1999,Page(s):599 - 600 vol.3
A lot of specialty optical fibers and devices with specific dispersion characteristics are being developed to manipulate pulse broadening effects as well as nonlinear interactions in optical fiber communication systems. Measurement of chromatic dispersion is an essential part of developing a new optical device. A modulation phase shift technique a is commonly used time-of-flight method for measuri...Show More
Analysis of cladding mode waveguide dispersion and its effects on the spectra of long period fiber grating
Publication Year: 1999,Page(s):601 - 602 vol.3
We proposed a new optical fiber waveguide structure for application of long period grating (LPG) fiber filters that can individually isolate the coupling of cladding modes could be applied to cascaded LPG filters.Show More
The single-atom microlaser is one and the only type of single atom lasers realized experimentally so far. The gain medium is a beam of excited, non-interacting two-level atoms (/spl lambda/=791 nm, /sup 3/P/sup 1//spl rarr//sup 1/S/sub 0/ transition of /sup 138/Ba) entering an ultra-low loss resonator one at a time. This laser device utilizes the coherent atom-cavity interaction, often referred to...Show More
Two-dimensional systems are of great interest in physics as the celebrated quantum-Hall effects show, which are based on a 2D electron gas. Neutral systems involve thin He films and spin polarized atomic hydrogen in a cryogenic environment, where the successful creation of a 2D quasi-condensate was recently reported. Over the last years, with laser cooling and trapping techniques at hand, several ...Show More
A magneto-optical trap for chromium atoms
T. Pfau;S. Hensler;J. Stuhler;P.O. Schmidt;A. Bell;S. Locher;J. Mlynek
Publication Year: 1999,Page:607 vol.3
Summary form only given. We present our results on the realization of a magneto-optical trap (MOT) for chromium atoms with repumpers on two intercombination lines. The high magnetic moment (6 Bohr magneton) and the isotopic composition of chromium are promising for investigation of collective quantum statistical effects in ultracold Bose- and Fermi gases in steep magnetic traps. Chromium is also i...Show More
Realization of Bose-Einstein condensation in a rubidium vapor using a simple double magneto-optical trap
Publication Year: 1999,Page(s):608 - 609 vol.3
Since the first experimental demonstration of Bose-Einstein condensation (BEC) in an alkali-metal vapor, this subject has been attracting remarkable interests in the physics society. Hundreds of theoretical works concerning this subject have been reported so far. However, the number of reports about BEC experiments is much less than that of the theoretical works. This is because only a few experim...Show More
Atom guiding in an atomic funnel is very useful for many interesting atom optical experiments requiring the precise control of atomic motion. We have obtained a doughnut-shaped laser beam by coupling a Ti:sapphire laser into a hollow core optical fiber and collimating the output laser beam of the fiber with a microscope objective lens. Using such a doughnut-shaped laser beam [2 mm inner diameter a...Show More
Strong enhancement of extracted spontaneous emission from GaInAsP 2-D photonic crystals
T. Baba;K. Inoshita;H. Tanaka;J. Yonekura;M. Ariga;A. Matsutani;T. Miyamoto;F. Koyama;K. Iga
Publication Year: 1999,Page(s):612 - 613 vol.3
III-V semiconductor photonic crystals are expected to achieve an ultimate high efficiency in light emitters. However, due to the difficulty of fabrication, only a few groups have succeeded in observing the photonic bandgap (PBG) in small crystals designed for lightwaves. In addition, the most important issues, i.e., modulation of spontaneous emission intensity and lifetime, have never been evaluat...Show More
64/spl deg/C continuous-wave operation of 1.5-/spl mu/m vertical-cavity surface-emitting laser with Al/sub x/O/sub y//GaAs mirror
Publication Year: 1999,Page(s):614 - 615 vol.3
Until now, the best performance at 1.5 /spl mu/m vertical-cavity surface-emitting lasers (VCSELs) has been reported from double-fused structures consisting of p-AlGaAs/GaAs mirrors, InP based active layers and n-AlAs/GaAs mirrors. For p-mirrors, AlGaAs/GaAs pairs are generally used instead of AlAs/GaAs pairs to reduce free carrier absorption. One way to reduce the free carrier absorption even furt...Show More
Ultimate low threshold and high efficiency calculated for GaInAsP microdisk injection lasers with optimum posts
Publication Year: 1999,Page(s):616 - 617 vol.3
Recently, we have demonstrated the room temperature CW operation in a GaInAsP microdisk laser with a record low threshold of 150 /spl mu/A and the smallest disk diameter of 2 /spl mu/m. We expect to further improve the performance to make this device a fundamental active element in a functional photonic circuit. However, the ultimate performance has never been discussed. In the study, we investiga...Show More
Micro-aperture surface emitting laser for near field optical data storage
Publication Year: 1999,Page(s):618 - 619 vol.3
An ultra-high density optical memory using near field optics has been attracting much interest for future data storage. Betzig and coworkers (1992) demonstrated optical recording by an optical scanning microscope (NSOM) and suggested the possibility of tera byte data storage. One of the authors (K. Goto) proposed (1998) a tera byte optical memory system using a VCSEL array. One of the key issues i...Show More
Lateral carrier confinement for ultralow threshold quantum dot VCSELs
Publication Year: 1999,Page(s):620 - 621 vol.3
Semiconductor laser diodes have continually shrunk in size, a trend driven by the desire for low threshold current, high modulation speed, and lateral mode control. Oxide-defined apertures have demonstrated improved performance by reducing optical losses and current spreading in VCSELs, but carrier losses due to lateral diffusion in the active layer remain uncontrolled. This leakage of carriers du...Show More
Excimer laser ablation of biomaterials: the contribution of water in collagen films
Publication Year: 1999,Page(s):622 - 623 vol.3
Cited by: Patents (1)
We investigated the surface structure of the excimer laser ablation by the microphotoetching of dried and swelled collagen films using atomic force microscope (AFM) and scanning electron microscope (SEM) measurements. We characterized the roughness of the etched surface by topographical analysis. The thermal effect of the collagen was investigated from the changes in the amide I band of the debris...Show More
Formation mechanism dependence on laser power of UV-laser ablated silicon surface gratings
Publication Year: 1999,Page(s):624 - 625 vol.3
We report our results of UV-laser ablated Si surface gratings. It was found that different laser-matter interactions were involved in forming the surface gratings when different levels of laser power were used. Hence, different morphologies of gratings were observed. In fabricating a grating, a silicon wafer was exposed to the interference fringes formed through a prism or a holographic system wit...Show More
Environmentally harmonized plasma etching process using laser ablation of various solid materials
Publication Year: 1999,Page(s):626 - 627 vol.3
Polytetrafluoroethylene (PTFE) and polyvinylidenenefloride (PVDF) were selected as solid materials. PTFE and PVDF are fluorocarbon material ([CF/sub 2/-CF/sub 2/],) and hydrofluorocarbon materials ([CF/sub 2/-CH/sub 2/],), respectively. We have investigated the fluorocarbon species generated from the solid material using a quadrupole mass spectrometry (QMS) and the behaviors of CF/sub x/ (x=1-3) r...Show More
The fundamental physical mechanisms of laser ablation of a graphite: explosive bulk boiling and spinodal decomposition of a overheated liquid phase
Publication Year: 1999,Page(s):628 - 629 vol.3
Cited by: Papers (1)
We have studied laser ablation of a graphite by photoacoustics (PA), electrostatic probing (EP) of a carbon plasma and time-of-flight mass spectroscopy (TOFMS). The target of a graphite was evaporated in air by a Q-switched second harmonic of a Nd:YAG laser. Bipolar and unipolar time resolved transient acoustic signals were recorded with a calibrated piezoceramic transducer placed on a back side o...Show More
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