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Volume 21, Issue 11
Displaying 1-19 of 19 articles from this issue
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Hiroshi NISHIHARA1993 Volume 21 Issue 11 Pages 1077
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (101K) -
Ken'ichi KUBODERA1993 Volume 21 Issue 11 Pages 1078-1084
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSPhotonic devices utilizing nonlinear-optical effects will play an important role in future ultra-high-speed optical signal processing systems, such as high-bit-rate optical communica-tion, optical switching systems, optical information processing, and optical computing. Recent developments in second-harmonic-generation devices with high efficiencies and electrically-controlled optical switches with fast response times are shown as representatives of second-order nonlinear-optical devices. Developments in third-order nonlinear-optical devices, such as all-optical three-terminal devices, using glass, organic, semiconductor, and dielectric mate-rials are also shown.View full abstractDownload PDF (837K) -
Toshiki KISHIMOTO, Masahiro ITOH1993 Volume 21 Issue 11 Pages 1085-1088
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSOptical parametric oscillation (OPO) is the most powerful method to obtain the wide range of a strong mid-IR beam. While KTiOPO4 (KTP) has many advantages as an OPO converter comparing other crystals, it has a serious absorption around 3μm (an idler beam) when pumped by Nd: YAG laser. The RbTiOPO4 (RTP) crystals that we developed can evade this problem under the same conditions. RTP crystals have the better or at least the same poten-tials compared with KTP as an SHG and an OPO converters. The SHG is attainable under the same type-2 phase matching conditions (θ=90°, φ=56°) with a little larger nonlinear coeffi-cients. We measured other basic properties of RTP and compared with KTP.View full abstractDownload PDF (472K) -
Kazuhisa YAMAMOTO1993 Volume 21 Issue 11 Pages 1089-1096
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSQuasi-phase-matched second-harmonic-generation (QPM-SHG) is an attractive method for obtaining blue light, as phase-matching of an arbitrary wavelength may be achieved by appropriate periodic modulation of the nonlinear polarization. This paper describes recently reported QPM-SHG in waveguides, especially QPM-SHG in LiTaO3, which has large non-linearlity and high resistance to optical damage. Recent experiments in frequency doubling of laser diodes using the QPM-SHG device are also described.View full abstractDownload PDF (872K) -
Toshiaki SUHARA, Hiroshi NISHIHARA1993 Volume 21 Issue 11 Pages 1097-1105
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSRecent research works on waveguide quasi-phase matched second-harmonic generation (QPM-SHG) devices are reviewed with emphasis on devices using LiNbO3. At first fun-damental principle and theoretical characteristics of QPM-SHG devices are outlined. Various methods for ferroelectric domain inversion as a key process technique are described. Then ex-perimental results on QPM-SHG obtained thus far are reviewed with comparison to those obtained in devices of other materials, and related problems are discussed. Some novel device configurations for improving the performances or avoiding problems are also discussed.View full abstractDownload PDF (1457K) -
Masaru MATSUOKA1993 Volume 21 Issue 11 Pages 1106-1115
Published: November 29, 1993
Released on J-STAGE: August 04, 2010
JOURNAL FREE ACCESSThere is currently extensive interest in the nonlinear optical (NLO) properties of organic compounds. Especially, the large second or third order NLO responses of materials are impor-tant in the fields of optical device technology.
This paper reviews the syntheses of organic NLO compounds to correlate the NLO re-sponses with chemical structures. Molecular design by means of MO method and crystal en-gineering of NLO compounds is described in details. Nitroaniline and cyanostyryl derivatives with intramolecular charge-transfer chromophores have excellent NLO characteristics for second order NLO materials. On the other hand, large π-conjugated compounds, such as phthalocyanines, azo and azomethine dyes or special dyes with strong intermolecular hyd-rogen bonding to give “molecular sheet” are expected to have good third order NLO re-sponses for opto-electronics devices.View full abstractDownload PDF (1329K) -
Tetsuo TSUTSUI1993 Volume 21 Issue 11 Pages 1116-1124
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSMaterial design concept of polymeric materials applicable for 3rd-order nonlinear optical devices is reviewed. Firstly, the importance of distinguishing molecular origins for high 3rd-order optical nonlinearity is stressed. Molecular structures and preparation methods of majorπ-conjugated polymer films with potentially high optical nonlinearity are introduced. Then, relations between molecular structures and 3rd-order nonlinear susceptibilities are discussed. Stress is put on coherent 3rd-order nonlinearity, which can be examined with nonlinear sus-ceptibility spectra obtainable from third-harmonic generation experiments.View full abstractDownload PDF (1066K) -
Wataru SOTOYAMA, Satoshi TATSUURA, Tetsuzo YOSHIMURA1993 Volume 21 Issue 11 Pages 1125-1133
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSElectro-optic (EO) polymer waveguides are useful for optical circuit systems like inter-chip optical interconnections. They have many advantages such as potentiality of improving electro-optic coefficients, low dielectric constants, and capabilities of fabrication on various substrates and of construction of multi-layered structures. This paper describes vertical-type polymer optical switches we developed, which realize highly-integrated and multi-layered optical circuits. Two approaches we are trying for improving EO polymer materials are shown. One is to develop conventional poled polymers by screening nonlinear optical molecules using molecular orbital calculations. The other is to developing high-performance EO polymers in-cluding main-chain and conjugated polymers using vapor-phase film growth techniques which enable to control molecular order and alignment in polymers.View full abstractDownload PDF (1200K) -
Seiji FUKUDA, Tetsuya GOTOH1993 Volume 21 Issue 11 Pages 1134-1141
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSIn realizing optical-waveguide devices based on nonlinear-optic (NLO) organic materials, the key issues are the method for thin-film crystal growth and the micro-fabrication process of thin films. In this paper, the photo-lithographic process for fabrication of optical waveguides in NLO organic crystalline films is reviewed briefly as well as the vapor phase epitaxial growth of NLO organic materials. In particular, the discussion is focused on the vapor phase heteroepi-taxy of MNBA (4'-nitrobenzylidene-3-acetamino-4-methoxyaniline) crystal on MNBA-Et (that has a very similar crystal structure to MNBA). It was confirmed via the polarizing microscopy and double crystal x-ray diffraction analysis that the vapor phase deposition can provide a single-domained single crystal of MNBA on the entire surface of a MNBA-Et substrate exposed.View full abstractDownload PDF (1145K) -
Hiroyuki NASU1993 Volume 21 Issue 11 Pages 1142-1150
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSRecently, semiconductor microcrystal-doped glasses have been extensively studied. The motivation behind the studies is mainly the great potential for photonic applications. In speci-fic, they are powerful candidates for the photonic devices such as photonic shutters, switches and memories.
Commercial optical sharp-cut filter glasses are well-known as the traditional semiconductor-doped glasses. However, the amount and composition of semiconductor dopants are strictly li-mited since they are prepared through melting and quenching process at elevated tempera-tures. Therefore, new preparation techniques have been developed, and thus high amount and various kinds of semiconductors can be doped in the glasses nowadays. This paper reviews the various techniques to prepare semiconductor microcrystal-doped glasses, and properties and new applications of the glasses.View full abstractDownload PDF (1131K) -
Toshio FUKUMI1993 Volume 21 Issue 11 Pages 1151-1155
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSNonlinear optical properties of metal fine particle doped glasses and their application to waveguide device are reviewed. Emphasis is made on cubic nonlinear optical properties of gold fine particle doped glasses. Early pioneering studies of commercially available gold ruby glass were followed by the review of investigations of tailor-made gold fine particle glasses. In those studies, degenerate four-wave mixing (DFWM) was employed to study cubic optical nonlinearity of gold fine particle doped glasses. The measurement of cubic nonlinear suscepti-bility and time response of these glasses are discussed. An application of gold fine particle sys-tem to waveguide phase conjugation iss ummarized.View full abstractDownload PDF (494K) -
Masaki ASOBE, Ken'ichi KUBODERA, Terutoshi KANAMORI1993 Volume 21 Issue 11 Pages 1156-1165
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSChalcogenide glass fiber is one of the most promising nonlinear optical media for ultrafast all-optical switches because of its high optical nonlinearity and long interaction length. This paper reports ultrafast all-optical switching device using chalcogenide glass fibers. Recent stu-dies of nonlinear optical properties of the chalcogenide glass, single mode fiber fabrications, optical Kerr shutter experiments and calculation analysis taking the effect of group velocity dispersion into account are summarised. Effect of two photon absorption on all-optical switch-ing are also discussed.View full abstractDownload PDF (1113K) -
Tetsuya MIZUMOTO1993 Volume 21 Issue 11 Pages 1166-1173
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWaveguide optical bistable devices are discussed. An optical waveguide resonatorin which the third-order nonlinearity is involved brings about the bistability in transmission characteris-tics. From theo-retical considerations, it becomes clear that the DFB structure is preferable to achieve higher transmission in a high out-put state comparing to DBR. Also, the preliminary experimental results of wave- guide bistable devices using CdSxSei1-x dope glass substrates are demonstrated togetherwith their fabrication processes.View full abstractDownload PDF (1034K) -
Hiroaki ANDO1993 Volume 21 Issue 11 Pages 1174-1183
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSRecent advances in semiconductor crystal growth and process technology have made it possible to produce not only 2-dimensional quantum wells but also 1-D wire and 0-D box structures. The quantum confinement effects in these mesoscopic structures are expected to bring about new optical nonlinear phenomena which are useful for device applications. This paper reviews the recent progress in research on the optical nonlinear effects in the low-dimen-sional semiconductors. The unique nonlinear features are discussed in terms of optical proces-ses in these low-dimensional structures.View full abstractDownload PDF (1123K) -
Kazuhito TAJIMA, Shigeru NAKAMURA, Yoshimasa SUGIMOTO, Noboru HAMAO1993 Volume 21 Issue 11 Pages 1184-1192
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSAll-optical switches are attractive for future optical communication and data processing. However, there remain many problems to be solved before such switches become practical. In this paper, we first review and discuss various nonlinear effects relevant to all-optical switch-ing. Then experimental results are presented with a Mach-Zehnder type all-optical switch based on the band-filling nonlinearity of GaAs. In particular, a method is investigated that effectively reduces the slow relaxation time of band-filling nonlinearity. We also discuss a novel all-optical switch whose switch“off”time, as well as“on”time, is independent of the slow relaxation time.View full abstractDownload PDF (1096K) -
-Focusing on Optical Modulators-Hideaki TANAKA, Yuichi MATSUSHIMA1993 Volume 21 Issue 11 Pages 1193-1202
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWaveguide semiconductor modulators have been classified, and typical characteristics of the modulators have been reviewed. Short pulse generation and optical gate operation with non-linear properties in the modulators have been described. Much shorter pulse generation by us-ing tandem-connected electroabsorption modulators has been also described.View full abstractDownload PDF (1194K) -
Yoshiyuki ASAHARA1993 Volume 21 Issue 11 Pages 1203-1212
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSNd-and Er-doped waveguide lasers and amplifiers have recieved growing attention in recent years. This papar reviews on their lasing and amplification characteristics around 1.05, 1.35 and 1.55 μm. Their applications and future prospects are also reviewed brieflyView full abstractDownload PDF (1047K) -
Takeshi KAMIYA1993 Volume 21 Issue 11 Pages 1213-1215
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSOwing to the high density photon confinement nature of optical waveguide, it is expected that the nonlinear-optical waveguide devices gain improved performance over the bulk coun-terparts. The potential and the problem of useful nonlinear devices are discussed with special focus on (1) nonlinear-optical materials, (2) all optical switching devices, and (3) nonlinear optical signal conversion systems. It is concluded that these devices will open a profound way of ultrafast optical signal processing, if a good combination of material, device and system technologies is established.View full abstractDownload PDF (363K) -
1993 Volume 21 Issue 11 Pages i
Published: November 29, 1993
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (3629K)
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