Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814690
J. Shimada
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 interconnection with fiber-optics, we have built two prototype systems: (1) RWC-1/H which uses 36-bit parallel optical interconnection and, (2) RWC-1/N which has calibration free multiplex-demultiplexed optical interconnection, as derivatives of the massively parallel computer RWC-1.
{"title":"Optical interconnects in parallel computer RWC-1","authors":"J. Shimada","doi":"10.1109/CLEOPR.1999.814690","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814690","url":null,"abstract":"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 interconnection with fiber-optics, we have built two prototype systems: (1) RWC-1/H which uses 36-bit parallel optical interconnection and, (2) RWC-1/N which has calibration free multiplex-demultiplexed optical interconnection, as derivatives of the massively parallel computer RWC-1.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"1866 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457500","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.817817
P. Danehy, R. Farrow, R. Lucht, T. Reichardt
Degenerate four-wave mixing (DFWM) is a nonlinear optical process that has been developed for making quantitative measurements of gasdynamic properties in reactive environments. This technique can be used to measure temperature and species concentration in both flames and plasma environments. The resulting coherent signal beam makes DFWM particularly attractive for luminous and harsh environments, compared to incoherent techniques, such as laser-induced fluorescence (LIF). Furthermore, DFWM can probe non-fluorescing species. We describe methods for measuring velocities of gas flows using nearly-DFWM and translational temperatures using DFWM.
{"title":"Degenerate four-wave mixing velocimetry and translational temperature measurements","authors":"P. Danehy, R. Farrow, R. Lucht, T. Reichardt","doi":"10.1109/CLEOPR.1999.817817","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817817","url":null,"abstract":"Degenerate four-wave mixing (DFWM) is a nonlinear optical process that has been developed for making quantitative measurements of gasdynamic properties in reactive environments. This technique can be used to measure temperature and species concentration in both flames and plasma environments. The resulting coherent signal beam makes DFWM particularly attractive for luminous and harsh environments, compared to incoherent techniques, such as laser-induced fluorescence (LIF). Furthermore, DFWM can probe non-fluorescing species. We describe methods for measuring velocities of gas flows using nearly-DFWM and translational temperatures using DFWM.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123555588","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814766
Chang Yong Park, Chung Mok Lee, Eu Suk Oh, D. Cho
The energy shift of an atom due to its interaction with the oscillating electric field of an electromagnetic wave, or a laser light, is called the ac Stark shift. It has been studied both in the field of precision spectroscopy and atom optics. When the laser intensity is not constant spatially, its gradient gives rise to a dipole force. The force was used either to trap atoms in an optical trap or to reflect or guide atoms. We studied the ac Stark effect taking into account the fine structure of an alkali atom. We found that when the laser light is circularly polarized and properly detuned between the D1 and D2 transitions, the ac Stark shift can take the form of a pure Zeeman shift, hence the name analogous Zeeman shift.
{"title":"Measurement of the analogous Zeeman shift using a low-velocity intense source","authors":"Chang Yong Park, Chung Mok Lee, Eu Suk Oh, D. Cho","doi":"10.1109/CLEOPR.1999.814766","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814766","url":null,"abstract":"The energy shift of an atom due to its interaction with the oscillating electric field of an electromagnetic wave, or a laser light, is called the ac Stark shift. It has been studied both in the field of precision spectroscopy and atom optics. When the laser intensity is not constant spatially, its gradient gives rise to a dipole force. The force was used either to trap atoms in an optical trap or to reflect or guide atoms. We studied the ac Stark effect taking into account the fine structure of an alkali atom. We found that when the laser light is circularly polarized and properly detuned between the D1 and D2 transitions, the ac Stark shift can take the form of a pure Zeeman shift, hence the name analogous Zeeman shift.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127036587","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814760
T. Momose
High-resolution laser spectroscopy on condensed matter is usually considered to be beyond the reach because of the extreme broadening of both the homogeneous and inhomogeneous spectral linewidth. A marked exception to this general consensus is found in the rotation-vibration transitions in parahydrogen (p-H/sub 2/) crystals. The sharpest linewidth observed so far is 4 MHz (FWHM) of a transition of D/sub 2/ in the p-H/sub 2/ crystal. Because of the weak intermolecular interaction and a large intermolecular distance (3.783A), the rotational motion of molecules in the p-H/sub 2/ crystal is well quantized, and the rotational quantum number J remains as a good quantum number.
{"title":"High-resolution laser spectroscopy of solid hydrogen","authors":"T. Momose","doi":"10.1109/CLEOPR.1999.814760","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814760","url":null,"abstract":"High-resolution laser spectroscopy on condensed matter is usually considered to be beyond the reach because of the extreme broadening of both the homogeneous and inhomogeneous spectral linewidth. A marked exception to this general consensus is found in the rotation-vibration transitions in parahydrogen (p-H/sub 2/) crystals. The sharpest linewidth observed so far is 4 MHz (FWHM) of a transition of D/sub 2/ in the p-H/sub 2/ crystal. Because of the weak intermolecular interaction and a large intermolecular distance (3.783A), the rotational motion of molecules in the p-H/sub 2/ crystal is well quantized, and the rotational quantum number J remains as a good quantum number.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114888765","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814685
O. Morikawa, M. Tonouchi
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 polarized along the current direction. Formerly, we proposed and demonstrated that the two-dimensional supercurrent distribution can be visualized by scanning the laser spot with detecting the radiation amplitude. We propose a new system for vector mapping of the supercurrent flow by detecting the amplitude and polarization direction of the THz radiation.
{"title":"Vector mapping of supercurrent flow in YBCO thin films using polarization of THz radiation excited by femtosecond laser pulses","authors":"O. Morikawa, M. Tonouchi","doi":"10.1109/CLEOPR.1999.814685","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814685","url":null,"abstract":"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 polarized along the current direction. Formerly, we proposed and demonstrated that the two-dimensional supercurrent distribution can be visualized by scanning the laser spot with detecting the radiation amplitude. We propose a new system for vector mapping of the supercurrent flow by detecting the amplitude and polarization direction of the THz radiation.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115059092","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.817964
M. Kato, R. Touda, Y. Nakano
The external modulator is a key device for long-haul, high-speed optical transmission systems. In such systems the product of the square of bit rate and the transmission length is limited by the modulator's chirp parameter and the fiber dispersion; the optimum chirp parameters for conventional silica fiber and dispersion-shifted fiber are -1 and 0, respectively. However, most multiple-quantum-well electroabsorption modulators produce positive chirp parameter. In this paper, we theoretically show that the chirp parameter is controllable through well width of the asymmetric triple coupled quantum well.
{"title":"Control of chirp parameter in electroabsorption modulators by designing asymmetric triple coupled quantum well structure","authors":"M. Kato, R. Touda, Y. Nakano","doi":"10.1109/CLEOPR.1999.817964","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817964","url":null,"abstract":"The external modulator is a key device for long-haul, high-speed optical transmission systems. In such systems the product of the square of bit rate and the transmission length is limited by the modulator's chirp parameter and the fiber dispersion; the optimum chirp parameters for conventional silica fiber and dispersion-shifted fiber are -1 and 0, respectively. However, most multiple-quantum-well electroabsorption modulators produce positive chirp parameter. In this paper, we theoretically show that the chirp parameter is controllable through well width of the asymmetric triple coupled quantum well.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"697 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116104127","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.817864
T. Souma, A. Maeda, H. Furuhashi, T. Yoshikawa, Y. Uchida, K. Kojima, A. Ohashi, M. Ieda, S. Ochiai, T. Mizutani
Vanadylphthalocyanine (VOPc) thin films were prepared on a PET (polyethyleneterephthalate) film substrate by a molecular beam epitaxy (MBE). The PET substrate is more flexible, transparent and simple in manufacturing than alkali-halide one. Therefore, the VOPc thin film accumulated on PET film is attractive in making waveguides. On the other hand, the third harmonic intensity of nonlinear optical film increases with the thickness of VOPc thin film. Therefore, It's important to prepare a thicker VOPc film on PET substrate. Conditions for preparing a VOPc film on PET film are not well understood yet. In this paper, we succeeded to prepare the VOPc films on PET substrate. VOPc nonlinear optical films were obtained under the control of substrate temperature, and evaporating time.
{"title":"Nonlinear optical properties of vanadylphthalocyanine thin films prepared on polyethyleneterephthalate substrate","authors":"T. Souma, A. Maeda, H. Furuhashi, T. Yoshikawa, Y. Uchida, K. Kojima, A. Ohashi, M. Ieda, S. Ochiai, T. Mizutani","doi":"10.1109/CLEOPR.1999.817864","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817864","url":null,"abstract":"Vanadylphthalocyanine (VOPc) thin films were prepared on a PET (polyethyleneterephthalate) film substrate by a molecular beam epitaxy (MBE). The PET substrate is more flexible, transparent and simple in manufacturing than alkali-halide one. Therefore, the VOPc thin film accumulated on PET film is attractive in making waveguides. On the other hand, the third harmonic intensity of nonlinear optical film increases with the thickness of VOPc thin film. Therefore, It's important to prepare a thicker VOPc film on PET substrate. Conditions for preparing a VOPc film on PET film are not well understood yet. In this paper, we succeeded to prepare the VOPc films on PET substrate. VOPc nonlinear optical films were obtained under the control of substrate temperature, and evaporating time.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116539059","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.811415
J. Seo, U. Hommerich, M. Thaik, J. MacKenzie, C. R. Abernathy, J. Zavada
GaN:Er prepared by metalorganic molecular beam epitaxy shows intense 1.54 /spl mu/m photoluminescence (PL) at room temperature. Efficient below-gap absorption bands have been identified using photoluminescence excitation spectroscopy. An infrared hybrid InGaN-GaN:Er LED operating at 1.54 /spl mu/m has been demonstrated. Even though the resulting emission at 1.54 /spl mu/m was weak, it shows that the electroluminescence from InGaN can be used to excited Er ions in GaN.
{"title":"Spectroscopy and 1.54 /spl mu/m light emitting device based on erbium-doped gallium nitride","authors":"J. Seo, U. Hommerich, M. Thaik, J. MacKenzie, C. R. Abernathy, J. Zavada","doi":"10.1109/CLEOPR.1999.811415","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.811415","url":null,"abstract":"GaN:Er prepared by metalorganic molecular beam epitaxy shows intense 1.54 /spl mu/m photoluminescence (PL) at room temperature. Efficient below-gap absorption bands have been identified using photoluminescence excitation spectroscopy. An infrared hybrid InGaN-GaN:Er LED operating at 1.54 /spl mu/m has been demonstrated. Even though the resulting emission at 1.54 /spl mu/m was weak, it shows that the electroluminescence from InGaN can be used to excited Er ions in GaN.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116579132","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.814679
T.G. Kim, Y. Suzuki, M. Shimizu, M. Watanabe, M. Ogura
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.
{"title":"Direct gain modulation of AlGaAs-GaAs V-grooved quantum wire lasers","authors":"T.G. Kim, Y. Suzuki, M. Shimizu, M. Watanabe, M. Ogura","doi":"10.1109/CLEOPR.1999.814679","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.814679","url":null,"abstract":"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.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366352","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}
Pub Date : 1999-08-30DOI: 10.1109/CLEOPR.1999.817951
P. Hu, Tow Chong Chong, L. P. Shi, X. W. Xu, Lin Li, B. Xu
We discuss the fabrication method of planar waveguides in KLN (K/sub 3/Li/sub 2/Nb/sub 5/O/sub 15/) substrates using ion-exchange process. It is found that only the TM mode can be guided in such waveguides. The waveguides have an exponential decay index profile with depth and surface index increase in the order of a few /spl mu/m and 1/spl rarr/10/sup -2/, respectively. Also the waveguide formed near -z face is deeper than that near +z face.
{"title":"Fabrication and characterization of optical waveguides in potassium lithium niobate (KLN) substrates","authors":"P. Hu, Tow Chong Chong, L. P. Shi, X. W. Xu, Lin Li, B. Xu","doi":"10.1109/CLEOPR.1999.817951","DOIUrl":"https://doi.org/10.1109/CLEOPR.1999.817951","url":null,"abstract":"We discuss the fabrication method of planar waveguides in KLN (K/sub 3/Li/sub 2/Nb/sub 5/O/sub 15/) substrates using ion-exchange process. It is found that only the TM mode can be guided in such waveguides. The waveguides have an exponential decay index profile with depth and surface index increase in the order of a few /spl mu/m and 1/spl rarr/10/sup -2/, respectively. Also the waveguide formed near -z face is deeper than that near +z face.","PeriodicalId":408728,"journal":{"name":"Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114575956","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}
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