Pub Date : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118822
Xiaoke Zhang, Ying Li, Yao Cai, Mingyang Su, Yanliang He, Shuqing Chen
We present a novel method to generate fast switchable optical vortex by beam combining. Optical vortex is generated by the coherent superposition of Gaussian beams, and vortex mode switching is achieved by phase modulating each Gaussian beam with an electro-optic phase modulator (EOPM). We analyze the effects of different parameters on the combined optical vortex quality and use a spiral phase plate to measure the beam combining efficiency. The results show that the Gaussian beam waist radius, the beam-arrays, and the translation distance all have a substantial effect on the combined beam quality and combining efficiency, an efficiency of over 80% can be achieved by choosing parameters appropriately. And the rate of vortex mode switching can increase from ∼100Hz (traditional method) to ∼1GHz (EOPM).
{"title":"Generating fast switchable optical vortices by beam combining","authors":"Xiaoke Zhang, Ying Li, Yao Cai, Mingyang Su, Yanliang He, Shuqing Chen","doi":"10.1109/CLEOPR.2017.8118822","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118822","url":null,"abstract":"We present a novel method to generate fast switchable optical vortex by beam combining. Optical vortex is generated by the coherent superposition of Gaussian beams, and vortex mode switching is achieved by phase modulating each Gaussian beam with an electro-optic phase modulator (EOPM). We analyze the effects of different parameters on the combined optical vortex quality and use a spiral phase plate to measure the beam combining efficiency. The results show that the Gaussian beam waist radius, the beam-arrays, and the translation distance all have a substantial effect on the combined beam quality and combining efficiency, an efficiency of over 80% can be achieved by choosing parameters appropriately. And the rate of vortex mode switching can increase from ∼100Hz (traditional method) to ∼1GHz (EOPM).","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"22 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84001502","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118826
D. Akamatsu
A single nanoparticle of SiO2 is optically trapped inside an ultrahigh-vacuum compatible chamber system. The motion of the particle inside the trap is observed with the Michelson-type interferometer. The system presented in this paper will enable us to realize a mixture of a single nanoparticle and a laser-cooled gas for investigating interaction between a mesoscopic particle and laser-cooled atoms.
{"title":"Optical trap of a nanoparticle in ultra-high vacuum towards a mixture of a nanoparticle and a laser-cooled gas","authors":"D. Akamatsu","doi":"10.1109/CLEOPR.2017.8118826","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118826","url":null,"abstract":"A single nanoparticle of SiO2 is optically trapped inside an ultrahigh-vacuum compatible chamber system. The motion of the particle inside the trap is observed with the Michelson-type interferometer. The system presented in this paper will enable us to realize a mixture of a single nanoparticle and a laser-cooled gas for investigating interaction between a mesoscopic particle and laser-cooled atoms.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"12 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82926016","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119077
Amy S. K. Tong, C. Mitchell, J. Mackenzie, J. Wilkinson
Photoluminescence is observed from tantalum pentoxide thin film waveguides, doped with 3 wt% of Tm2O3 (Tm:Ta2O5), in the wavelength range of 1.6 to 2.1 μm. Maximum emission was obtained using a pump wavelength of 795 nm, which corresponds to the excitation of thulium ions to the 3H4 manifold. The effect of post-deposition annealing temperature and duration on the photoluminescence lifetime and intensity was investigated. This is the first report of photoluminescence around 1.8 μm and lifetime measurements of Tm:Ta2O5 films with potential for gain in a planar platform.
{"title":"Photoluminescence of Tm-doped Ta2O5 waveguides","authors":"Amy S. K. Tong, C. Mitchell, J. Mackenzie, J. Wilkinson","doi":"10.1109/CLEOPR.2017.8119077","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119077","url":null,"abstract":"Photoluminescence is observed from tantalum pentoxide thin film waveguides, doped with 3 wt% of Tm<inf>2</inf>O<inf>3</inf> (Tm:Ta<inf>2</inf>O<inf>5</inf>), in the wavelength range of 1.6 to 2.1 μm. Maximum emission was obtained using a pump wavelength of 795 nm, which corresponds to the excitation of thulium ions to the <sup>3</sup>H4 manifold. The effect of post-deposition annealing temperature and duration on the photoluminescence lifetime and intensity was investigated. This is the first report of photoluminescence around 1.8 μm and lifetime measurements of Tm:Ta<inf>2</inf>O<inf>5</inf> films with potential for gain in a planar platform.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"9 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89060999","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118858
W. Talatalsong, R. Ismaeel, M. Beresna, G. Brambilla
Optical fiber couplers with ∼300nm waist diameter are used as compact temperature sensors from room temperature to 661oC, showing an average temperature sensitivity of 55 pm/oC and a maximum sensitivity of 60pm/ oC at the highest temperature.
{"title":"A nano-fiber coupler thermometer","authors":"W. Talatalsong, R. Ismaeel, M. Beresna, G. Brambilla","doi":"10.1109/CLEOPR.2017.8118858","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118858","url":null,"abstract":"Optical fiber couplers with ∼300nm waist diameter are used as compact temperature sensors from room temperature to 661<sup>o</sup>C, showing an average temperature sensitivity of 55 pm/<sup>o</sup>C and a maximum sensitivity of 60pm/ <sup>o</sup>C at the highest temperature.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88289946","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118786
Qiang Wang, Zhen Wang, W. Ren
We report a novel intracavity trace gas sensor by merging photoacoustic spectroscopy and an erbium doped fiberring laser to achieve a noise-equivalent absorption coefficient of 3.25×10−7 cm−1Hz−1,2 for acetylene detection.
{"title":"An erbium doped fiber-ring laser-based intracavity photoacoustic C2H2 gas sensor","authors":"Qiang Wang, Zhen Wang, W. Ren","doi":"10.1109/CLEOPR.2017.8118786","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118786","url":null,"abstract":"We report a novel intracavity trace gas sensor by merging photoacoustic spectroscopy and an erbium doped fiberring laser to achieve a noise-equivalent absorption coefficient of 3.25×10<sup>−7</sup> cm<sup>−1</sup>Hz<sup>−1,2</sup> for acetylene detection.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"229 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77290805","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118645
Jeeranan Boonruangkan, H. Farrokhi, Young‐Jin Kim
A well-known speckle which comes from the coherent property of laser source has limited the laser imaging application. Quantitative Phase Imaging (QPI) also suffers from this speckle noise when illuminate with coherent source. A rotational diffuser is a considerable method to minimize the speckle by averaging the speckle contrast in time. Here, we employ the dual optical diffuser-static and moving diffusers — to suppress speckle noise in QPI. Continuous-wave laser is used to illuminate polystyrene micro-bead as a sample. Due to the averaging independent speckle pattern, speckle noise in phase image is reduced by maintaining the quality of fringe. The ability of moving diffuser in speckle noise suppression is presented in Fourier domain via Fast Fourier Transform (FFT) technique and topographic phase map. This work proposes a valuable technique for efficient suppression of the coherent speckle in QPI.
{"title":"Rotational diffuser for speckle reduction in quantitative phase imaging","authors":"Jeeranan Boonruangkan, H. Farrokhi, Young‐Jin Kim","doi":"10.1109/CLEOPR.2017.8118645","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118645","url":null,"abstract":"A well-known speckle which comes from the coherent property of laser source has limited the laser imaging application. Quantitative Phase Imaging (QPI) also suffers from this speckle noise when illuminate with coherent source. A rotational diffuser is a considerable method to minimize the speckle by averaging the speckle contrast in time. Here, we employ the dual optical diffuser-static and moving diffusers — to suppress speckle noise in QPI. Continuous-wave laser is used to illuminate polystyrene micro-bead as a sample. Due to the averaging independent speckle pattern, speckle noise in phase image is reduced by maintaining the quality of fringe. The ability of moving diffuser in speckle noise suppression is presented in Fourier domain via Fast Fourier Transform (FFT) technique and topographic phase map. This work proposes a valuable technique for efficient suppression of the coherent speckle in QPI.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"21 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77577345","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}
Through the reduction of mirror-resistance of vertical-cavity surface-emitting lasers, the optical bandwidth of 22.5 GHz is successfully achieved by implementation of zinc-diffusion process. It shows that lower mirror-resistance provides better transmission quality under similar optical bandwidth. With 20 ohm resistance reduction, the bandwidth limitation by electrical parasitics can be effectively improved from 6.4 to 14.71 GHz confirmed by the small-signal extraction results.
{"title":"Investigation of mirror-resistance reduction in the signal transmission integraty of VCSELs","authors":"Chun-Yen Peng, Yan-Chien Lee, Cheng-Ting Tsai, Shan-Fong Leong, Hsuan-Yun Kao, Yu-Chieh Chi, Gong-Ru Lin, C. Wu","doi":"10.1109/CLEOPR.2017.8118830","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118830","url":null,"abstract":"Through the reduction of mirror-resistance of vertical-cavity surface-emitting lasers, the optical bandwidth of 22.5 GHz is successfully achieved by implementation of zinc-diffusion process. It shows that lower mirror-resistance provides better transmission quality under similar optical bandwidth. With 20 ohm resistance reduction, the bandwidth limitation by electrical parasitics can be effectively improved from 6.4 to 14.71 GHz confirmed by the small-signal extraction results.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"34 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87637428","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119062
Eunjoo Lee, B. Y. Kim
We report the actively mode locked fiber laser where the center wavelengths of optical pulses change discretely per roundtrip. By using two pairs of dense wavelength division multiplexers, we select and split the signals with multiple wavelengths to reduce the gain competition between lasing wavelengths. The experimental results demonstrate the simultaneous mode locking of three different wavelengths with the spacing of 0.8 nm. We suggest that this novel design could provide an access to high number of wavelength steps and narrow optical linewidth with a short (< 1 km) cavity, which are advantageous for optical coherence tomography applications.
{"title":"Discretely wavelength-swept fiber laser based on temporal-spectral multiplexing","authors":"Eunjoo Lee, B. Y. Kim","doi":"10.1109/CLEOPR.2017.8119062","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119062","url":null,"abstract":"We report the actively mode locked fiber laser where the center wavelengths of optical pulses change discretely per roundtrip. By using two pairs of dense wavelength division multiplexers, we select and split the signals with multiple wavelengths to reduce the gain competition between lasing wavelengths. The experimental results demonstrate the simultaneous mode locking of three different wavelengths with the spacing of 0.8 nm. We suggest that this novel design could provide an access to high number of wavelength steps and narrow optical linewidth with a short (< 1 km) cavity, which are advantageous for optical coherence tomography applications.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"14 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87605855","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118927
Defen Guo, Yejin Zhang, T. Chu
Broadband, low-loss and low-crosstalk silicon mode (de)multiplexers with optimized tapers based on shortcuts to adiabaticity (STA) are proposed and experimentally demonstrated. The measured insertion losses and crosstalks are less than 1.1 dB and −24 dB, respectively, for the five two-mode mode-division-multiplexing (MDM) links over wavelengths ranging from 1500 nm to 1600 nm. The four-mode MDM link showed measured insertion losses and crosstalks less than 1.3 dB and −23 dB, respectively, within the same wavelength range. The method paves the way for future adaptation of the STA protocols to various components.
{"title":"Mode multiplexers with tapers based on shortcuts to adiabaticity","authors":"Defen Guo, Yejin Zhang, T. Chu","doi":"10.1109/CLEOPR.2017.8118927","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118927","url":null,"abstract":"Broadband, low-loss and low-crosstalk silicon mode (de)multiplexers with optimized tapers based on shortcuts to adiabaticity (STA) are proposed and experimentally demonstrated. The measured insertion losses and crosstalks are less than 1.1 dB and −24 dB, respectively, for the five two-mode mode-division-multiplexing (MDM) links over wavelengths ranging from 1500 nm to 1600 nm. The four-mode MDM link showed measured insertion losses and crosstalks less than 1.3 dB and −23 dB, respectively, within the same wavelength range. The method paves the way for future adaptation of the STA protocols to various components.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"51 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73448085","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118776
M. Okada, H. Kishikawa, N. Goto, Yi-Lin Yu, S. Liaw
A multi-point temperature sensing system using linear-cavity laser consisting of a semiconductor optical amplifier, an arrayed waveguide grating, and fiber Bragg grating elements was proposed. We experimentally demonstrated two-point simultaneous temperature sensing.
{"title":"Multipoint temperature sensing using linear-cavity fiber laser with AWG and FBGs","authors":"M. Okada, H. Kishikawa, N. Goto, Yi-Lin Yu, S. Liaw","doi":"10.1109/CLEOPR.2017.8118776","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118776","url":null,"abstract":"A multi-point temperature sensing system using linear-cavity laser consisting of a semiconductor optical amplifier, an arrayed waveguide grating, and fiber Bragg grating elements was proposed. We experimentally demonstrated two-point simultaneous temperature sensing.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"104 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88129551","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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