Pub Date : 1996-11-18DOI: 10.1109/LEOS.1996.571621
R.Q. Yang, Chih-hsiang Lin, P. Chang, S. Murry, D. Zhang, S. Pei, S. Kurtz, S. Chu, F. Ren
We can circumvent the fast phonon scattering loss in type-I QC lasers, while retaining the cascaded tunneling injection advantage, by utilizing photon emission between an electron state and a hole state in a new class of QC lasers based on type-II QWs, which was first proposed by Yang and is referred to as type-II QC lasers. The type-II QC lasers can have a higher radiative efficiency because the phonon relaxation process is greatly suppressed in an interband transition. Here, we report the first observation of mid-IR electroluminescence in such a type-II QC laser structure. We illustrates the band diagram of two periods of an InAs-AlSb-GaSb type-II QC laser diode under a forward bias.
{"title":"Mid-IR interband cascade light emitting diodes based on type-II quantum wells","authors":"R.Q. Yang, Chih-hsiang Lin, P. Chang, S. Murry, D. Zhang, S. Pei, S. Kurtz, S. Chu, F. Ren","doi":"10.1109/LEOS.1996.571621","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571621","url":null,"abstract":"We can circumvent the fast phonon scattering loss in type-I QC lasers, while retaining the cascaded tunneling injection advantage, by utilizing photon emission between an electron state and a hole state in a new class of QC lasers based on type-II QWs, which was first proposed by Yang and is referred to as type-II QC lasers. The type-II QC lasers can have a higher radiative efficiency because the phonon relaxation process is greatly suppressed in an interband transition. Here, we report the first observation of mid-IR electroluminescence in such a type-II QC laser structure. We illustrates the band diagram of two periods of an InAs-AlSb-GaSb type-II QC laser diode under a forward bias.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124288044","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571523
In Kim, K. Uppal, P. Dapkus
In this paper, we describe a more accurate method to calculate the gain saturation behavior in a QW semiconductor laser traveling wave amplifier. Solving the rate equation for the carrier density in its steady state condition in conjunction with the gain and recombination rate calculated using Kane-type Hamiltonian, a rigorous relation is derived for the gain saturation behavior with increasing photon density.
{"title":"Evaluation of gain saturation behaviour in travelling wave semiconductor amplifiers","authors":"In Kim, K. Uppal, P. Dapkus","doi":"10.1109/LEOS.1996.571523","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571523","url":null,"abstract":"In this paper, we describe a more accurate method to calculate the gain saturation behavior in a QW semiconductor laser traveling wave amplifier. Solving the rate equation for the carrier density in its steady state condition in conjunction with the gain and recombination rate calculated using Kane-type Hamiltonian, a rigorous relation is derived for the gain saturation behavior with increasing photon density.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116886410","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571923
M. Oka, H. Masuda, H. Kikuchi, S. Kubota
High power deep ultraviolet (UV) radiation has attracted much attention in areas such as photo-lithography. We report progress in improving the quality of Czochralski-grown /spl beta/-BaB/sub 2/O/sub 4/ (BBO) which is essential for generating high average output power in the deep ultraviolet regime. In order to evaluate our CZ grown BBO, a flash-lamp pumped Q-switched Nd:YAG laser (Quantel YG-682S) was employed.
{"title":"Progress in all-solid-state deep-ultraviolet lasers","authors":"M. Oka, H. Masuda, H. Kikuchi, S. Kubota","doi":"10.1109/LEOS.1996.571923","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571923","url":null,"abstract":"High power deep ultraviolet (UV) radiation has attracted much attention in areas such as photo-lithography. We report progress in improving the quality of Czochralski-grown /spl beta/-BaB/sub 2/O/sub 4/ (BBO) which is essential for generating high average output power in the deep ultraviolet regime. In order to evaluate our CZ grown BBO, a flash-lamp pumped Q-switched Nd:YAG laser (Quantel YG-682S) was employed.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116959030","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571962
F.B. Mezger, M. Brandt-Pearce
A simple and flexible method is presented and analyzed for counteracting pulse dispersion in a fiber-optic code division multiple access system by allowing the pulses transmitted in each user's code to overlap into neighboring pulse slots. The simultaneous use of the entire channel by users in an optical CDMA system using ultrashort pulses requires minimization of dispersive effects. After establishing a dispersion model, a method of intentionally widening the transmitted pulses to counteract pulse dispersion in an optical CDMA system while maintaining the same high data rate and the same number of users is suggested. It is demonstrated that these widened pulses are much less susceptible to dispersion.
{"title":"Dispersion limited fiber-optic CDMA systems with overlapped signature sequences","authors":"F.B. Mezger, M. Brandt-Pearce","doi":"10.1109/LEOS.1996.571962","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571962","url":null,"abstract":"A simple and flexible method is presented and analyzed for counteracting pulse dispersion in a fiber-optic code division multiple access system by allowing the pulses transmitted in each user's code to overlap into neighboring pulse slots. The simultaneous use of the entire channel by users in an optical CDMA system using ultrashort pulses requires minimization of dispersive effects. After establishing a dispersion model, a method of intentionally widening the transmitted pulses to counteract pulse dispersion in an optical CDMA system while maintaining the same high data rate and the same number of users is suggested. It is demonstrated that these widened pulses are much less susceptible to dispersion.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117227598","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571636
J. Soole, M. Amersfoort, H. Leblanc, A. Rajhel, C. Caneau, C. Youtsey, I. Adesida
Summary form only given. We report a high-performance polarization-independent InP arrayed waveguide grating (AWG) filter employing a compact reflective geometry. Here, we show that square-core AWGs may be realized in a reflection geometry, and still provide high quality filtering. Successful use of a reflective AWG geometry will permit advanced AWG-based components to be made with smaller die-sizes.
{"title":"High performance polarization-independent WDM filtering using an InP reflective arrayed waveguide grating","authors":"J. Soole, M. Amersfoort, H. Leblanc, A. Rajhel, C. Caneau, C. Youtsey, I. Adesida","doi":"10.1109/LEOS.1996.571636","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571636","url":null,"abstract":"Summary form only given. We report a high-performance polarization-independent InP arrayed waveguide grating (AWG) filter employing a compact reflective geometry. Here, we show that square-core AWGs may be realized in a reflection geometry, and still provide high quality filtering. Successful use of a reflective AWG geometry will permit advanced AWG-based components to be made with smaller die-sizes.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124879277","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571678
Jianyao Chen, R. Maciejko, T. Makino
Using the spatially-dependent multimode rate equations, this paper presents a detailed study of both the complex coupling effect and the spatial hole burning effect on side mode suppression in DFB lasers.
利用空间相关的多模速率方程，详细研究了DFB激光器侧模抑制中的复杂耦合效应和空间孔燃烧效应。
{"title":"High side mode suppression in gain-coupled DFB lasers","authors":"Jianyao Chen, R. Maciejko, T. Makino","doi":"10.1109/LEOS.1996.571678","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571678","url":null,"abstract":"Using the spatially-dependent multimode rate equations, this paper presents a detailed study of both the complex coupling effect and the spatial hole burning effect on side mode suppression in DFB lasers.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115253779","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 : 1996-11-18DOI: 10.1109/LEOS.1996.571611
A. Willner, S.H. Huang, X. Y. Zou, S. Hwang, D.A. Smith, Z. Bao
One of the most promising technologies in optical networks is the use of wavelength-division multiplexing (WDM), in which many different-wavelength channels are simultaneously transmitted along the optical fiber. One key underlying technology which has enabled these systems is the introduction of the erbium-doped fiber amplifier EDFA. A glaring disadvantage of the EDFA is that the gain is not uniform with wavelength, causing a significant power and signal-to-noise ratio (SNR) differential among many channels. We will discuss our demonstrations of dynamically equalizing three 2.5 Gbit/s WDM channels in which the channel power differential is reduced from 20 dB to only 1 dB over a distance of 2,500 km by placing an acousto optical filter in an EDFA.
{"title":"Dynamic channel equalization in reconfigurable WDM networks using acousto-optic tunable filters","authors":"A. Willner, S.H. Huang, X. Y. Zou, S. Hwang, D.A. Smith, Z. Bao","doi":"10.1109/LEOS.1996.571611","DOIUrl":"https://doi.org/10.1109/LEOS.1996.571611","url":null,"abstract":"One of the most promising technologies in optical networks is the use of wavelength-division multiplexing (WDM), in which many different-wavelength channels are simultaneously transmitted along the optical fiber. One key underlying technology which has enabled these systems is the introduction of the erbium-doped fiber amplifier EDFA. A glaring disadvantage of the EDFA is that the gain is not uniform with wavelength, causing a significant power and signal-to-noise ratio (SNR) differential among many channels. We will discuss our demonstrations of dynamically equalizing three 2.5 Gbit/s WDM channels in which the channel power differential is reduced from 20 dB to only 1 dB over a distance of 2,500 km by placing an acousto optical filter in an EDFA.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116146944","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 : 1996-11-18DOI: 10.1109/LEOS.1996.565185
D. Grischkowsky, R. Cheville
Here we describe the use of optoelectronic techniques to generate single cycle pulses of freely propagating THz radiation, and thereby demonstrate ultrawide bandwidth scattering from simple geometrical objects. These pulses are the best approximation to impulse excitation ever used in ranging studies. The absolute bandwith is also larger than any other previously reported. The relatively short wavelengths of the THz pulse permit target features of less than 1 mm to be observed, making this technique ideal for scale ranging measurements since realistic target to wavelength ratios can be maintained. Furthermore, the measurement window achieved by the optolectronic gating technique enables only the scattered signal from the target to be detected, providing background free measurements.
{"title":"Scale ranging with subpsec pulses of THz radiation","authors":"D. Grischkowsky, R. Cheville","doi":"10.1109/LEOS.1996.565185","DOIUrl":"https://doi.org/10.1109/LEOS.1996.565185","url":null,"abstract":"Here we describe the use of optoelectronic techniques to generate single cycle pulses of freely propagating THz radiation, and thereby demonstrate ultrawide bandwidth scattering from simple geometrical objects. These pulses are the best approximation to impulse excitation ever used in ranging studies. The absolute bandwith is also larger than any other previously reported. The relatively short wavelengths of the THz pulse permit target features of less than 1 mm to be observed, making this technique ideal for scale ranging measurements since realistic target to wavelength ratios can be maintained. Furthermore, the measurement window achieved by the optolectronic gating technique enables only the scattered signal from the target to be detected, providing background free measurements.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121967016","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 : 1996-11-18DOI: 10.1109/LEOS.1996.565230
E. Sinofsky
Laser photocoagulation has long been used to produce localized heating and subsequent destruction of tissue in an attempt to treat tumors and other diseases. A heat resistant, polymer diffusing fiber tip has been developed that produces an homogenous light emission over its light diffusing length. The light emitted from the diffuser is equally distributed into the tissue with no hot spots that would cause carbonization to occur. With this approach we have demonstrated large lesions, with no carbonization produced in reasonably short (about 5 min.) laser exposures.
{"title":"High power diffusing tip fibers for photocoagulation","authors":"E. Sinofsky","doi":"10.1109/LEOS.1996.565230","DOIUrl":"https://doi.org/10.1109/LEOS.1996.565230","url":null,"abstract":"Laser photocoagulation has long been used to produce localized heating and subsequent destruction of tissue in an attempt to treat tumors and other diseases. A heat resistant, polymer diffusing fiber tip has been developed that produces an homogenous light emission over its light diffusing length. The light emitted from the diffuser is equally distributed into the tissue with no hot spots that would cause carbonization to occur. With this approach we have demonstrated large lesions, with no carbonization produced in reasonably short (about 5 min.) laser exposures.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116859659","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 : 1996-11-18DOI: 10.1109/LEOS.1996.565224
Y. Chen, V. Kottler, N. Essaidi, C. Chappert
We propose a scanning near-field technique to study magneto-optical (MO) properties of magnetic multilayered thin films. The experiments are carried out using an integrated far-field and near-field microscope. Gold coated fiber tips are used as scanning probes for both STM and SNOM signal collection and the tip to sample separation is controlled within the tunneling distance. We additionally placed a magnetic field coil around the sample holder, which produces a DC field up to 1 kOe. This allows us to study MO properties of magnetic thin films as a function of applied field for both far field Kerr observation and scanning near-field imaging.
{"title":"Scanning near-field observation of magnetic domains in Pt/Co thin films and their development as a function of applied field","authors":"Y. Chen, V. Kottler, N. Essaidi, C. Chappert","doi":"10.1109/LEOS.1996.565224","DOIUrl":"https://doi.org/10.1109/LEOS.1996.565224","url":null,"abstract":"We propose a scanning near-field technique to study magneto-optical (MO) properties of magnetic multilayered thin films. The experiments are carried out using an integrated far-field and near-field microscope. Gold coated fiber tips are used as scanning probes for both STM and SNOM signal collection and the tip to sample separation is controlled within the tunneling distance. We additionally placed a magnetic field coil around the sample holder, which produces a DC field up to 1 kOe. This allows us to study MO properties of magnetic thin films as a function of applied field for both far field Kerr observation and scanning near-field imaging.","PeriodicalId":332726,"journal":{"name":"Conference Proceedings LEOS'96 9th Annual Meeting IEEE Lasers and Electro-Optics Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128388533","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：