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 4 -1999
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CLEO/Pacific Rim'99 - The Pacific Rim Conference on Lasers and Electo-Optics [front matter]
Publication Year: 1999,Page(s):i - xii
CLEO/Pacific Rim'99 - The Pacific Rim Conference on Lasers and Electo-Optics [front matter]
Extension of dispersion decreasing fiber-pulse shaping method for the optical time division multiplexing system source applications
Publication Year: 1999,Page(s):1071 - 1072 vol.4
Cited by: Papers (1)
The optical time division multiplexed (OTDM) transmission system has been a topic of continuous research due to their unique advantages over conventional NRZ based transmissions, including the possibility of nonlinearity based all-optical information processing, and tolerances on dispersions penalties in the link. Among various key technologies which enable the successful integration of OTDM syste...Show More
THz electromagnetic wave radiation from DC-biased high-Q semiconductor microcavities
Publication Year: 1999,Page(s):1073 - 1074 vol.4
High-Q semiconductor microcavities (SMCs), where light-matter interactions can enter nonperturbative regime, provide a interesting system from both the viewpoints of fundamental physics and application. To date, the optical responses of such systems in frequency or time domain have been investigated intensively, and the basic characteristics such as the appearance of the polariton doublets and the...Show More
Quantitative study of exciton-exciton polarization interaction in a strongly coupled semiconductor quantum well microcavity
C. Rankumar;Yu.P. Svirko;R. Shimano;T. Kise;M. Kuwata-Gonokami
Publication Year: 1999,Page(s):1075 - 1076 vol.4
The nonlinear optical responses of a strongly coupled exciton-photon system in a semiconductor microcavity structure under weak excitation can be explained by a weak exciton-exciton interaction due to the nonideal bosonic (weakly interacting bosons) nature of the excitons. The exciton-exciton interaction leads to an attractive interaction between excitons with opposite spin, and a repulsive intera...Show More
Partial erasing of temporal memory by using picosecond accumulated photon echoes in dye doped polymer film
Publication Year: 1999,Page(s):1077 - 1078 vol.4
The stimulated photon echo memory using persistent hole-burning materials has been attracting much attention as a possible candidate for high-density data storage. Most studies have been related to the writing and reading processes and little attention has been paid for a partial erasing. We demonstrate for the first time that partial erasing of photon echo memory can be accomplished by simply emp...Show More
Charge transfer-like interaction between organic dyes and aromatic molecules doped in amorphous polymer detected by incoherent photon echoes
Publication Year: 1999,Page(s):1079 - 1080 vol.4
Relaxation processes of dye molecules doped in polymer hosts have been understood by various kinds of interaction, such as the dipole-dipole interaction between molecules, the interaction with the two-level systems (TLS) in the host polymer and the electron-phonon interaction. The study on these interactions has been conducted to search for new efficient materials for the photonic device such as, ...Show More
Experimental synchronization of chaotic oscillations in two Nd:YVO/sub 4/ microchip lasers
Publication Year: 1999,Page(s):1081 - 1082 vol.4
We experimentally demonstrated synchronization of chaos in a master-slave type set-up with two diode-pumped Nd:YVO/sub 4/ microchip lasers (/spl lambda/=1064 nm) for the first time. Chaotic output in the microchip lasers is easily obtained by modulating the injection current of the laser diode for pumping (pump modulation) near the relaxation oscillation frequency (/spl sim/MHz). The relatively lo...Show More
Optical devices integrated with semiconductor optical amplifier
Publication Year: 1999,Page(s):1083 - 1084 vol.4
Cited by: Patents (1)
Semiconductor optical amplifiers have been used as key optical components for high capacity communication systems. Monolithic integration is necessary for the stable operation of these devices and for wider applications. In this paper, the coupling technique between different waveguides was discussed and research results about optical devices integrated with SOAs were presented. In particular lase...Show More
Preparation and fluorescence properties of sol-gel derived Er-doped SiO/sub 2/-GeO/sub 2/-Al/sub 2/O/sub 3/ planar optical waveguides
Q. Xiang;Y. Zhou;Y.L. Lam;Y.C. Chan;C.H. Kam;B.S. Ooi;H.X. Zhang
Publication Year: 1999,Page(s):1085 - 1086 vol.4
We focus on the optical properties of sol-gel derived Er-doped SiO/sub 2/-GeO/sub 2/-Al/sub 2/O/sub 3/ planar waveguides on SOS (silica-on-silicon) substrates. The study shows that the sol-gel method is a suitable technique to incorporate erbium ions in germanosilicate optical waveguides with a relatively high doping concentration, and aluminum co-doping can enhance the fluorescence intensity. The...Show More
Erbium/ytterbium co-doped optical waveguide amplifier in soda-lime glass by silver ion exchange
Publication Year: 1999,Page(s):1087 - 1088 vol.4
Cited by: Papers (1)
We have described the experimental results of the gain characteristics of Er/Yb co-doped optical waveguide amplifiers in soda-lime glasses fabricated by the silver ion exchange method. Silica glasses are attractive because of their superior chemical resistance and compatibility to optical fibers. Measured absorption and fluorescence spectra are shown. A net gain of 4.34 dB and gain coefficient of ...Show More
Optical nonlinearity in optical fibers and semiconductor optical amplifiers
Publication Year: 1999,Page(s):1089 - 1090 vol.4
Cited by: Papers (3)
Optical nonlinearity is being intensively studied for advanced optical functions, such as all-optical switching and wavelength conversion, in future lightwave communications. For transparent operation independent of signal format and data rate, especially usable is partially degenerate four-wave mixing (FWM) in which a new wavelength light (FWM light) is generated from a pump and a signal light. S...Show More
High power laser with integrated lens using focused ion beam etching
A.M. Rashed;K.A. Williams;R.V. Penty;I.H. White;P.J. Heard;J.C.C. Day;G.C. Allen
Publication Year: 1999,Page(s):1091 - 1092 vol.4
Cited by: Papers (1)
Control of the optical mode in high power lasers is essential for a range of high brightness optical pumping applications. The inclusion of a lens within the cavity of a semiconductor laser is desirable not only to increase the proportion of light coupled back into the optical waveguide for improved efficiency, but also in the reduction of the divergence in the far field emission for higher bright...Show More
Direct gain modulation of AlGaAs-GaAs V-grooved quantum wire lasers
Publication Year: 1999,Page(s):1093 - 1094 vol.4
Pico-second optical pulse generation /spl sim/20 ps is firstly demonstrated by direct modulation of V-grooved AlGaAs-GaAs quantum wire lasers. Some of interesting results on their lasing characteristics under continuous-wave and gain switching conditions are presented.Show More
Al free active region high power laser diode array on misoriented wafers
Donghwan Kim;In-Sung Cho;Jong-Seung Hwang;Young-Hak Chang;Min-Soo Noh;Hee-Seok Song;Tae-Kyung Yoo;Ki-Young Um;Ki-Kwan Han
Publication Year: 1999,Page(s):1095 - 1096 vol.4
Cited by: Patents (1)
Nowadays, high power laser diodes are widely used in many applications due to their high wall plug efficiency, improved long-term reliability, and small size in addition to reductions in their cost. One of the main concerns in growth of InGaP/InGaAsP material systems using MOCVD is an indium carry over. It occurs when a relatively indium poor InGaAsP layer is grown on an InGaP layer. It is well kn...Show More
Stability of the beam quality of 0.98-/spl mu/m InGaAlAs tapered laser oscillators
A. Schmitt;M. Mikulla;M. Walther;R. Kiefer;J. Braunstein;G. Weimann
Publication Year: 1999,Page(s):1097 - 1098 vol.4
We have investigated the beam quality and the astigmatism of tapered semiconductor laser oscillators under perturbation conditions to specify under which conditions such devices can be employed for direct applications such as material processing. The observed saturation of the astigmatism is an important indication that when the laser output is focused the resulting spot position will not change s...Show More
Highly selective carrier injection in V-groove quantum wire light-emitting diodes
Publication Year: 1999,Page(s):1099 - 1100 vol.4
We report on the observation of highly efficient carrier injection into GaAs/AlGaAs V-groove QWR light-emitting diodes (LEDs) containing self-ordered vertical quantum wells (VQWs), resulting in narrow linewidth (10 meV) electroluminescence (EL) from one-dimensional (1D) excitons at room temperature. The GaAs/AlGaAs QWRs were grown by low pressure organometallic chemical vapor deposition on GaAs su...Show More
Implantation-induced intermixing in GaAs/AlGaAs quantum well structures and its application to quantum well lasers
Publication Year: 1999,Page(s):1101 - 1102 vol.4
We demonstrate the use of ion implantation to induce intermixing of GaAs/AlGaAs quantum wells. The influence of various parameters such as implantation dose and temperature, annealing conditions and Al mole fraction are presented. Finally, the application of this technique to tune the lasing wavelength of GRINSCH laser diodes is demonstrated.Show More
Highly efficient generation of THz radiation in semiconductors under magnetic field
Publication Year: 1999,Page(s):1103 - 1104 vol.4
Previously, we have reported the significant enhancement of THz radiation power from InAs under a magnetic field when irradiated with femtosecond optical pulses. In this presentation, we report the spectrum control of this intense THz-radiation by the width of the excitation pulses and magnetic field. A Ti:sapphire laser delivered 100-fsec pulses for the excitation. The sample was non-doped bulk I...Show More
Vector mapping of supercurrent flow in YBCO thin films using polarization of THz radiation excited by femtosecond laser pulses
Publication Year: 1999,Page(s):1105 - 1106 vol.4
THz radiation is emitted into free space from YBCO thin films by exciting with femtosecond laser pulses under a bias current, magnetic field, and magnetic-flux trapped state. The emission mechanism is proposed to originate from the ultrafast supercurrent modulation by optical pulses. The amplitude of the radiation is proportional to the supercurrent density at the exciting laser spot and it is pol...Show More
Generation of THz beams in Cd/sub x/Zn/sub 1-x/Te crystals
Publication Year: 1999,Page(s):1107 - 1108 vol.4
Cited by: Patents (2)
We have investigated generation of the far-infrared THz pulse in Cd/sub x/Zn/sub 1-x/Te based on optical rectification. For an optical wavelength of 820 nm the best conversion efficiency for the THz pulse generation in the frequency range of 1-2 THz is obtained in ZnTe. Calculations based on the phase matching condition in these (bi-)ternary materials qualitatively explain observation.Show More
Significant enhancement of the THz radiation from InAs[100] clean surface at low-temperature
H. Ohtake;S. Ono;S. Izumida;Z. Liu;K. Kurihara;N. Sarukura;K. Watanabe;Y. Matsumoto
Publication Year: 1999,Page(s):1109 - 1110 vol.4
A lot of THz-radiation sources have been intensively studied for applications to sensing or imaging, and a time-resolved spectroscopy. We had demonstrated the significant enhancement of THz-radiation power from InAs under a magnetic field irradiated with femtosecond optical pulses. In this case, the InAs emitter was at room temperature and was kept in the air without any special treatment. For pra...Show More
Propagation characteristics of free-space terahertz electromagnetic pulses
Publication Year: 1999,Page(s):1111 - 1112 vol.4
Free-space terahertz electromagnetic pulses driven by femtosecond lasers have been utilized for studying the far-infrared and transient characteristics of various materials and applied to the terahertz imaging. Those experiments can be significantly improved by optimizing the terahertz pulse characteristics such as the pulse width, dispersion, frequency spectrum, etc. However, the characteristics ...Show More
High speed VCSEL array head for tera byte optical disk
Publication Year: 1999,Page(s):1113 - 1114 vol.4
Near-field optical technologies are inevitable for the development of an ultrahigh density optical memory disk system because of the diffraction limited focused beam diameter is too wide to write/read fine bits on an optical disk. The method of parallel light beams with near-field optical technology using very fine tips of special cone prisms as output windows of the evanescent waves are used in t...Show More
Optical interconnects in parallel computer RWC-1
Publication Year: 1999,Page(s):1115 - 1116 vol.4
Cited by: Patents (1)
Massively parallel computers require an extremely high throughput and a high flexibility in the layout of nodes, boards and cabinets. Optical-fiber transmission is suitable for the inter-node connection in these computer systems because fiber-optics features large throughput, low loss, light weight, compactness, and immunity to electro-magnetic interference (EMI). To confirm the feasibility of int...Show More
A new architecture of optical cell compressor and expander for WDM/TDM switching systems
Publication Year: 1999,Page(s):1117 - 1118 vol.4
The optical cell compression and expansion is a key technology for the photonic TDM or WDM/TDM hybrid switching systems, which are indispensable due to their advantages of high capacity and high speed in switching operation and close compatibility with optical broadband networks. We propose in this paper a new architecture of optical cell compressor and expander. The proposed scheme of cell compre...Show More
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