Pub Date : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292388
W. Jia, Liyong Jiang, Hipeng Li, G. Zheng, Xiang-yin Li, Yuan Jun
An optimization algorithm is used to design two-dimensional photonic crystals in hexagonal lattice for large absolute band gaps under light line. By optimizing the location and radius of circular hole in the unit cell, we present four designs considering different circular hole numbers. The genetic algorithm finally yielded a photonic crystal with an absolute common band gap of 0.0796(2πc/a) at the mid-frequency of 0.3712(2πc/a).
{"title":"Genetic algorithm for band gap optimization under light line in two-dimensional photonic crystals","authors":"W. Jia, Liyong Jiang, Hipeng Li, G. Zheng, Xiang-yin Li, Yuan Jun","doi":"10.1109/CLEOPR.2009.5292388","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292388","url":null,"abstract":"An optimization algorithm is used to design two-dimensional photonic crystals in hexagonal lattice for large absolute band gaps under light line. By optimizing the location and radius of circular hole in the unit cell, we present four designs considering different circular hole numbers. The genetic algorithm finally yielded a photonic crystal with an absolute common band gap of 0.0796(2πc/a) at the mid-frequency of 0.3712(2πc/a).","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80782854","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292556
Yanrong Song, Peng Zhang, J. Tian, Xinping Zhang, C. Jagadish, H. Tan
A semiconductor disk laser with a transparent chemical vapor deposited diamond heatspreader is presented. The gain region of the semiconductor disk includes 16 non-compensated compressively strained InGaAs quantum wells. 710mW continuous-wave output power at 1043nm is produced using a 3% output coupler and 6100mW incident pump power. The slope-efficiency is 14.2% and the optical-to-optical conversion efficiency is 11.6%. The effect of the diamond heatspreader on the laser is also analyzed.
{"title":"Semiconductor disk laser with a diamond heatspreader","authors":"Yanrong Song, Peng Zhang, J. Tian, Xinping Zhang, C. Jagadish, H. Tan","doi":"10.1109/CLEOPR.2009.5292556","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292556","url":null,"abstract":"A semiconductor disk laser with a transparent chemical vapor deposited diamond heatspreader is presented. The gain region of the semiconductor disk includes 16 non-compensated compressively strained InGaAs quantum wells. 710mW continuous-wave output power at 1043nm is produced using a 3% output coupler and 6100mW incident pump power. The slope-efficiency is 14.2% and the optical-to-optical conversion efficiency is 11.6%. The effect of the diamond heatspreader on the laser is also analyzed.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85490798","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292681
Y. He, Qing Peng, Wei Zhang, Zhouping Su
The results denoted the polarity of the Rayleigh pulse generated by a line-source laser in hollow cylinder is insensitive to materials' parameters, and only determined by the angle between the source and the detection point.
{"title":"Numerical study of the laser-induced surface rayleigh wave' s polarity in different material hollow cylinders","authors":"Y. He, Qing Peng, Wei Zhang, Zhouping Su","doi":"10.1109/CLEOPR.2009.5292681","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292681","url":null,"abstract":"The results denoted the polarity of the Rayleigh pulse generated by a line-source laser in hollow cylinder is insensitive to materials' parameters, and only determined by the angle between the source and the detection point.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85493842","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292679
Yinzhou Yan, L. Ji, Yong Bao, Yi-jian Jiang
A parallel-axis positioning device with “twice positioning” method is presented to exectly locate the laser spot at a special position on workpiece for laser macro-processing. Position accuracy of the laser spot on workpiece reaches 0.01mm.
{"title":"Parallel-axis positioning device for laser processing: Design and applications","authors":"Yinzhou Yan, L. Ji, Yong Bao, Yi-jian Jiang","doi":"10.1109/CLEOPR.2009.5292679","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292679","url":null,"abstract":"A parallel-axis positioning device with “twice positioning” method is presented to exectly locate the laser spot at a special position on workpiece for laser macro-processing. Position accuracy of the laser spot on workpiece reaches 0.01mm.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77187603","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292596
Po-Chi Ou, Ja-Hon Lin, C. Chang, W. R. Liu, W. Hsieh
Ultrafast carrier dynamics of ZnO epifilm were investigated by the pump probe meausrement. Relative fast occruring and recovery of band gap renormalizaion following the band filling effect will result in transmission change at 362 nm.
{"title":"Carrier dynamics of thin Zno epifilm above band-gap states","authors":"Po-Chi Ou, Ja-Hon Lin, C. Chang, W. R. Liu, W. Hsieh","doi":"10.1109/CLEOPR.2009.5292596","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292596","url":null,"abstract":"Ultrafast carrier dynamics of ZnO epifilm were investigated by the pump probe meausrement. Relative fast occruring and recovery of band gap renormalizaion following the band filling effect will result in transmission change at 362 nm.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78775335","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292469
Q. Fang, Linjun Wang, Jian Huang, K. Tang, Yi Zhang, Qinkai Zeng, J. Min, Wei-min Shi, Yiben Xia
AFM, Raman spectroscopy, FTIR spectroscopy and Hall effect measurements were used to analyze nanocrystalline diamond film. The surface structure and conductivity as well as CH stretching bonds of the film was demonstrated.
{"title":"Studies on the surface structure of nanocrystalline diamond films for OPFET applications","authors":"Q. Fang, Linjun Wang, Jian Huang, K. Tang, Yi Zhang, Qinkai Zeng, J. Min, Wei-min Shi, Yiben Xia","doi":"10.1109/CLEOPR.2009.5292469","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292469","url":null,"abstract":"AFM, Raman spectroscopy, FTIR spectroscopy and Hall effect measurements were used to analyze nanocrystalline diamond film. The surface structure and conductivity as well as CH stretching bonds of the film was demonstrated.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87033967","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292706
Zhousu Xu, Cheng Cheng
The transverse mode of high power transverse flow CO2 laser is simulated by solving the laser kinetics equations, using a one-dimension-current model, and according to the discharge filed and the gas flow in the resonator. The electrode configuration and gas flow are the primary factors which influence the laser transverse mode.
{"title":"Study on the transverse mode of high power transverse flow CO2 laser","authors":"Zhousu Xu, Cheng Cheng","doi":"10.1109/CLEOPR.2009.5292706","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292706","url":null,"abstract":"The transverse mode of high power transverse flow CO2 laser is simulated by solving the laser kinetics equations, using a one-dimension-current model, and according to the discharge filed and the gas flow in the resonator. The electrode configuration and gas flow are the primary factors which influence the laser transverse mode.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82656721","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292613
H. Ren
We supposed to use the hollow core photonic crystal fiber as the gas cell for grating-assisted phase matching of high harmonic generation below 1keV. The conversion efficiency is expected to be dramatically improved.
{"title":"Grating-assisted phase matching of high harmonic generation in hollow core photonic crystal fiber","authors":"H. Ren","doi":"10.1109/CLEOPR.2009.5292613","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292613","url":null,"abstract":"We supposed to use the hollow core photonic crystal fiber as the gas cell for grating-assisted phase matching of high harmonic generation below 1keV. The conversion efficiency is expected to be dramatically improved.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79740059","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292409
S. Fan, Xingyu Zhang, Qingpu Wang, Chen Zhang, Z. Cong, Xiaolei Zhang, Zengguang Qin, Zhen Zhang, Zhaojun Liu
A method recording weak CBS signal with CCD is presented. Integration is employed to increase the signal-to-noise ratio and the optimized integration interval is discussed. Numerical simulation and experimental results are presented.
{"title":"Measuring the weak coherent backscattering with CCD","authors":"S. Fan, Xingyu Zhang, Qingpu Wang, Chen Zhang, Z. Cong, Xiaolei Zhang, Zengguang Qin, Zhen Zhang, Zhaojun Liu","doi":"10.1109/CLEOPR.2009.5292409","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292409","url":null,"abstract":"A method recording weak CBS signal with CCD is presented. Integration is employed to increase the signal-to-noise ratio and the optimized integration interval is discussed. Numerical simulation and experimental results are presented.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85368234","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 : 2009-10-30DOI: 10.1109/CLEOPR.2009.5292606
Y. Hsieh, S. Kuo, F. Lai
GaN-based light-emitting diodes (LEDs) with naturally textured surface grown by metal-organic chemical vapor deposition (MOCVD) were fabricated. A naturally textured p-GaN surface layer was achieved by controlling the growth temperature. The output power of the naturally textured surface LED with 850°C growth temperature increased > 50% than the commercial LED. The results show that the naturally textured surface LED could extremely enhance light extraction efficiency and be a candidate for manufacturing high-efficient low-cost GaN-based LEDs.
{"title":"Enhancement in the extraction efficiency of GaN-based LED with naturally textured surface","authors":"Y. Hsieh, S. Kuo, F. Lai","doi":"10.1109/CLEOPR.2009.5292606","DOIUrl":"https://doi.org/10.1109/CLEOPR.2009.5292606","url":null,"abstract":"GaN-based light-emitting diodes (LEDs) with naturally textured surface grown by metal-organic chemical vapor deposition (MOCVD) were fabricated. A naturally textured p-GaN surface layer was achieved by controlling the growth temperature. The output power of the naturally textured surface LED with 850°C growth temperature increased > 50% than the commercial LED. The results show that the naturally textured surface LED could extremely enhance light extraction efficiency and be a candidate for manufacturing high-efficient low-cost GaN-based LEDs.","PeriodicalId":6452,"journal":{"name":"2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89645101","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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