Pub Date : 2009-05-31DOI: 10.1364/CLEO.2009.CTUGG1
G. Belenky, L. Shterengas, G. Kipshidze, T. Hosoda, S. Suchalkin
This work discusses the latest achievements in design and performance of type I GaSb based lasers. It focuses on the performance of the room temperature operated lasers based on InGaAsSb/AlGaAsSb/GaSb and InGaAsSb/InAlGaAsSb/GaSb compressively strained heterostructures. The characteristics of the double-quantum-well GaSb-based diode lasers operating in 2.3-2.4 mum region with a room-temperature CW output power in excess of 1 W and a maximum power-conversion efficiency of 20 % are also presented and discussed.
{"title":"Advances in the development of the GaSb-based laser diodes operating within spectral range of 2 – 3.5 μm","authors":"G. Belenky, L. Shterengas, G. Kipshidze, T. Hosoda, S. Suchalkin","doi":"10.1364/CLEO.2009.CTUGG1","DOIUrl":"https://doi.org/10.1364/CLEO.2009.CTUGG1","url":null,"abstract":"This work discusses the latest achievements in design and performance of type I GaSb based lasers. It focuses on the performance of the room temperature operated lasers based on InGaAsSb/AlGaAsSb/GaSb and InGaAsSb/InAlGaAsSb/GaSb compressively strained heterostructures. The characteristics of the double-quantum-well GaSb-based diode lasers operating in 2.3-2.4 mum region with a room-temperature CW output power in excess of 1 W and a maximum power-conversion efficiency of 20 % are also presented and discussed.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124081670","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688693
E. Rafailov, M. Cataluna
In this review we describe how quantum-dot structures have opened up new avenues in ultrafast science and technology, enabling efficient and compact devices for the generation and amplification of ultrashort optical pulses.
{"title":"Compact ultrashort pulse lasers based on quantum-dot structures","authors":"E. Rafailov, M. Cataluna","doi":"10.1109/LEOS.2008.4688693","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688693","url":null,"abstract":"In this review we describe how quantum-dot structures have opened up new avenues in ultrafast science and technology, enabling efficient and compact devices for the generation and amplification of ultrashort optical pulses.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123155843","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688532
P. Russell, M.S. Kang, A. Nazarkin, A. Brenn, G. Wiederhecker
The interaction between light and microwave sound can be strongly enhanced by tight confinement within the wavelength-scale core of a nano-structured photonic crystal fibre. A new family of efficient acousto-optical and nonlinear-optical devices is emerging.
{"title":"Microwave sound-light interactions in nanostructured photonic crystal fibres","authors":"P. Russell, M.S. Kang, A. Nazarkin, A. Brenn, G. Wiederhecker","doi":"10.1109/LEOS.2008.4688532","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688532","url":null,"abstract":"The interaction between light and microwave sound can be strongly enhanced by tight confinement within the wavelength-scale core of a nano-structured photonic crystal fibre. A new family of efficient acousto-optical and nonlinear-optical devices is emerging.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121813370","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688625
S. Liaw, Yu-Sheng Huang, Nan-Kuang Chen, Kuei-Chu Hsu
A hybrid fiber amplifier is a promising technology for dense wavelength division multiplexing (WDM) in multi-terabit systems. Recently, hybrid fiiber amplifiers are designed in order to maximize the span length and/or to minimize the impairments of fiber nonlinearities, and to extend the bandwidth of EDFAs
{"title":"Dispersion management and gain flattened a hybrid EDFA/RFA in pumping recycling mechanism","authors":"S. Liaw, Yu-Sheng Huang, Nan-Kuang Chen, Kuei-Chu Hsu","doi":"10.1109/LEOS.2008.4688625","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688625","url":null,"abstract":"A hybrid fiber amplifier is a promising technology for dense wavelength division multiplexing (WDM) in multi-terabit systems. Recently, hybrid fiiber amplifiers are designed in order to maximize the span length and/or to minimize the impairments of fiber nonlinearities, and to extend the bandwidth of EDFAs","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117150787","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688627
A. Densmore, D. Xu, S. Janz, J. Schmid, P. Waldron, P. Cheben, A. Delâge, G. Lopinski, T. Mischki
Using silicon photonic wire waveguides we demonstrate highly sensitive and ultra-compact optical circuits for molecular sensing. The high-index-contrast of these structures is exploited to fabricate new folded waveguide geometries beneficial for sensing, as well as optical switching applications.
{"title":"Silicon nanophotonic devices for sensing and switching applications","authors":"A. Densmore, D. Xu, S. Janz, J. Schmid, P. Waldron, P. Cheben, A. Delâge, G. Lopinski, T. Mischki","doi":"10.1109/LEOS.2008.4688627","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688627","url":null,"abstract":"Using silicon photonic wire waveguides we demonstrate highly sensitive and ultra-compact optical circuits for molecular sensing. The high-index-contrast of these structures is exploited to fabricate new folded waveguide geometries beneficial for sensing, as well as optical switching applications.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117242680","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688460
F. Capasso, N. Yu, J. Fan, Q.J. Wang, C. Pflugl, L. Diehl, T. Edamura, M. Yamanishi, H. Kan
This study has demonstrated that surface plasmons can be effectively employed for beam shaping of edge-emitting semiconductor lasers. This technique has greatly reduced their large intrinsic beam divergence by more than one order of magnitude, while preserving a high output power.
{"title":"Low divergence semiconductor lasers by plasmonic collimation","authors":"F. Capasso, N. Yu, J. Fan, Q.J. Wang, C. Pflugl, L. Diehl, T. Edamura, M. Yamanishi, H. Kan","doi":"10.1109/LEOS.2008.4688460","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688460","url":null,"abstract":"This study has demonstrated that surface plasmons can be effectively employed for beam shaping of edge-emitting semiconductor lasers. This technique has greatly reduced their large intrinsic beam divergence by more than one order of magnitude, while preserving a high output power.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"788 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121251325","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688790
C.C. Tsai, Y. Hsu, M. Chen, Y. Lo, Y. Lin, J. Kuang, H.L. Hu, S.B. Huang, C.W. Lee, Y.I. Su, W. Cheng
High-power light-emitting diodes (LEDs) modules encapsulated with different lens shapes after a thermal-aging test were studied experimentally and numerically. Samples from different manufacturers were aged at 65, 85, and 95degC under a constant driving current of 350 mA. The results showed that the optical power of the LED modules at the two view angles of plusmn (45deg~75deg) decreased more than the other view angles as the aging time increased. This was due to the reduction of radiation pattern from the corner effect of lens shape, resulted in lower output power. The simulation of the corner effect of lens shape is in good agreement with the experiment result. Results also showed that the center wavelength of the LED spectrum shift 5 nm after thermal aging 600 hours at 95degC because of degradation the lens material. The key module package related failure modes under thermal-aging may be due to the corner effect of lens shape and the degradation of the lens material. Therefore, improving the lens structure and lens material is essential to extend the operating life of the phosphor-based white LEDs modules.
{"title":"Decay of radiation pattern and spectrum of high-power LED modules in aging test","authors":"C.C. Tsai, Y. Hsu, M. Chen, Y. Lo, Y. Lin, J. Kuang, H.L. Hu, S.B. Huang, C.W. Lee, Y.I. Su, W. Cheng","doi":"10.1109/LEOS.2008.4688790","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688790","url":null,"abstract":"High-power light-emitting diodes (LEDs) modules encapsulated with different lens shapes after a thermal-aging test were studied experimentally and numerically. Samples from different manufacturers were aged at 65, 85, and 95degC under a constant driving current of 350 mA. The results showed that the optical power of the LED modules at the two view angles of plusmn (45deg~75deg) decreased more than the other view angles as the aging time increased. This was due to the reduction of radiation pattern from the corner effect of lens shape, resulted in lower output power. The simulation of the corner effect of lens shape is in good agreement with the experiment result. Results also showed that the center wavelength of the LED spectrum shift 5 nm after thermal aging 600 hours at 95degC because of degradation the lens material. The key module package related failure modes under thermal-aging may be due to the corner effect of lens shape and the degradation of the lens material. Therefore, improving the lens structure and lens material is essential to extend the operating life of the phosphor-based white LEDs modules.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127208604","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688842
R. Bose, J. McMillan, J. Gao, K. Rickey, C. Chen, D. Talapin, C. Murray, C. Wong
We present time-resolved cryogenic observations of Forster energy transfer in large, monodisperse lead sulphide quantum dots with ground state transitions near 1.5 mum (0.8 eV), in environments from 160 K to room temperature.
{"title":"Observation of efficient Förster energy transfer at 1.5 μm through temperature-tuning of monodisperse quantum dot solids","authors":"R. Bose, J. McMillan, J. Gao, K. Rickey, C. Chen, D. Talapin, C. Murray, C. Wong","doi":"10.1109/LEOS.2008.4688842","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688842","url":null,"abstract":"We present time-resolved cryogenic observations of Forster energy transfer in large, monodisperse lead sulphide quantum dots with ground state transitions near 1.5 mum (0.8 eV), in environments from 160 K to room temperature.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127492908","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688476
P. Mohajerani, A. Eftekhar, A. Adibi
We investigate the accuracy of fluorescent tomography in imaging deep objects in tissue using an information theoretic analysis of the information content of the measurements. Results are verified by experiments performed on a tissue phantom.
{"title":"Measurement information content in fluorescent molecular tomography: Experimental results","authors":"P. Mohajerani, A. Eftekhar, A. Adibi","doi":"10.1109/LEOS.2008.4688476","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688476","url":null,"abstract":"We investigate the accuracy of fluorescent tomography in imaging deep objects in tissue using an information theoretic analysis of the information content of the measurements. Results are verified by experiments performed on a tissue phantom.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125384081","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 : 2008-11-25DOI: 10.1109/LEOS.2008.4688821
J. Kohoutek, O. G. Memis, H. Mohseni
We have the device under test, which is either our detector or a piece of metal for calibration, mounted under the vibrating AFM tip. To activate the sample we either apply a changing voltage to the tip which generates an electrostatic force, or apply laser light to the sample which deforms the surface potential, altering the electrostatic force. With our AFM we feed the phase output of the vibrating tip to an oscilloscope and lockin amplifier. The lockin amplifier is synchronized with the function generator. This allows us to sense the phase change of the tip at the frequency of applied voltage or light. We monitor the phase change as opposed to the amplitude because it is much more sensitive to forces on the tip.
{"title":"An optoelectromechanical light sensor at 1.55 μm","authors":"J. Kohoutek, O. G. Memis, H. Mohseni","doi":"10.1109/LEOS.2008.4688821","DOIUrl":"https://doi.org/10.1109/LEOS.2008.4688821","url":null,"abstract":"We have the device under test, which is either our detector or a piece of metal for calibration, mounted under the vibrating AFM tip. To activate the sample we either apply a changing voltage to the tip which generates an electrostatic force, or apply laser light to the sample which deforms the surface potential, altering the electrostatic force. With our AFM we feed the phase output of the vibrating tip to an oscilloscope and lockin amplifier. The lockin amplifier is synchronized with the function generator. This allows us to sense the phase change of the tip at the frequency of applied voltage or light. We monitor the phase change as opposed to the amplitude because it is much more sensitive to forces on the tip.","PeriodicalId":280337,"journal":{"name":"LEOS 2008 - 21st Annual Meeting of the IEEE Lasers and Electro-Optics Society","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125585604","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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