Arsham Hamidi, Yakub Bayhaqi, Alexander Navarini, Philippe Cattin, Azhar Zam, Ferda Canbaz
Optical coherence tomography (OCT) combined with an ablative Er:YAG laser has been recognized as a promising technique for real-time monitoring and controlling the depth of laser-induced cuts during laser osteotomy procedures. In this study, a miniaturized OCT-assisted Er:YAG laser system was developed for controlled laser ablation of bone tissue. The developed system involved coupling a high-power Er:YAG laser into a sapphire fiber with a core diameter of 425 µm and miniaturizing the sample arm of a long-range swept-source OCT system. Controlled laser osteotomy experiments were performed to evaluate the performance of the miniaturized setup. Real-time depth monitoring and control were achieved through an optical shutter controlled by the OCT system. The experimental results showed controlled ablation with a mean accuracy of 0.028 mm when targeting depths of 1 mm, 3 mm, and 5 mm on cow femur bones. These results demonstrate the potential of the developed miniaturized OCT-assisted Er:YAG laser system for use in robotic-assisted minimally-invasive laser osteotomy.
{"title":"Towards Miniaturized OCT-Guided LaserOsteotomy: Integration of Fiber-Coupled Er:YAGLaser with OCT","authors":"Arsham Hamidi, Yakub Bayhaqi, Alexander Navarini, Philippe Cattin, Azhar Zam, Ferda Canbaz","doi":"10.1364/optcon.497483","DOIUrl":"https://doi.org/10.1364/optcon.497483","url":null,"abstract":"Optical coherence tomography (OCT) combined with an ablative Er:YAG laser has been recognized as a promising technique for real-time monitoring and controlling the depth of laser-induced cuts during laser osteotomy procedures. In this study, a miniaturized OCT-assisted Er:YAG laser system was developed for controlled laser ablation of bone tissue. The developed system involved coupling a high-power Er:YAG laser into a sapphire fiber with a core diameter of 425 µm and miniaturizing the sample arm of a long-range swept-source OCT system. Controlled laser osteotomy experiments were performed to evaluate the performance of the miniaturized setup. Real-time depth monitoring and control were achieved through an optical shutter controlled by the OCT system. The experimental results showed controlled ablation with a mean accuracy of 0.028 mm when targeting depths of 1 mm, 3 mm, and 5 mm on cow femur bones. These results demonstrate the potential of the developed miniaturized OCT-assisted Er:YAG laser system for use in robotic-assisted minimally-invasive laser osteotomy.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135768727","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}
Ultracold atoms in quasiperiodic lattices offer a versatile platform for studying many intriguingly disorder-driven phenomena. Here we study the quantum transport of noninteracting ultracold 133 Cs atoms in a one-dimensional quasiperiodic momentum lattice, which is formed by using the laser-coupled momentum states as synthetic dimensions. Through measurements of the site-resolved density distribution of atoms in the synthetic quasiperiodic lattice, we directly observe the transition from the atomic diffusive transport to Anderson localization in the initial injection site with increasing strength of the quasiperiodic modulation. We show the dependence of momentum width characterizing the atomic expansion degree on the quasiperiodic modulation strength, and our observation is in good agreement with the theoretical calculation. Our work provides significant insights for understanding the quantum spreading in disordered systems.
{"title":"Direct observation of Anderson localization ofultracold atoms in a quasiperiodic lattice","authors":"Wenbo Yan, Yuqing Li, Hongxing Zhao, Jizhou Wu, Wenliang Liu, Peng Li, Yongming Fu, Liantuan Xiao, Jie Ma, Suotang Jia","doi":"10.1364/optcon.499768","DOIUrl":"https://doi.org/10.1364/optcon.499768","url":null,"abstract":"Ultracold atoms in quasiperiodic lattices offer a versatile platform for studying many intriguingly disorder-driven phenomena. Here we study the quantum transport of noninteracting ultracold 133 Cs atoms in a one-dimensional quasiperiodic momentum lattice, which is formed by using the laser-coupled momentum states as synthetic dimensions. Through measurements of the site-resolved density distribution of atoms in the synthetic quasiperiodic lattice, we directly observe the transition from the atomic diffusive transport to Anderson localization in the initial injection site with increasing strength of the quasiperiodic modulation. We show the dependence of momentum width characterizing the atomic expansion degree on the quasiperiodic modulation strength, and our observation is in good agreement with the theoretical calculation. Our work provides significant insights for understanding the quantum spreading in disordered systems.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769609","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}
Mohannad Abu-Romoh, Nelson Costa, Yves Jaouën, Antonio Napoli, João Pedro, Bernhard Spinnler, Mansoor Yousefi
In this paper, we investigate the use of the learned digital back-propagation (LDBP) for equalizing dual-polarization fiber-optic transmission in dispersion-managed (DM) links. LDBP is a deep neural network that optimizes the parameters of DBP using the stochastic gradient descent. We evaluate DBP and LDBP in a simulated WDM dual-polarization fiber transmission system operating at 32 Gbaud/s per channel, with a dispersion map designed for a 28 × 72 km link with 15% residual dispersion. Our results show that in single-channel transmission, LDBP achieves an effective signal-to-noise ratio improvement of 6.3 dB and 2.5 dB using DP-16-QAM format, respectively, over linear equalization and DBP. In WDM transmission, the corresponding Q -factor gains are 1.1 dB and 0.4 dB, respectively. Additionally, we conduct a complexity analysis, which reveals that a frequency-domain implementation of LDBP and DBP is more favorable in terms of complexity than the time-domain implementation. These findings demonstrate the effectiveness of LDBP in mitigating the nonlinear effects in DM fiber-optic transmission systems.
{"title":"Equalization in Dispersion-Managed SystemsUsing Learned Digital Back-Propagation","authors":"Mohannad Abu-Romoh, Nelson Costa, Yves Jaouën, Antonio Napoli, João Pedro, Bernhard Spinnler, Mansoor Yousefi","doi":"10.1364/optcon.497117","DOIUrl":"https://doi.org/10.1364/optcon.497117","url":null,"abstract":"In this paper, we investigate the use of the learned digital back-propagation (LDBP) for equalizing dual-polarization fiber-optic transmission in dispersion-managed (DM) links. LDBP is a deep neural network that optimizes the parameters of DBP using the stochastic gradient descent. We evaluate DBP and LDBP in a simulated WDM dual-polarization fiber transmission system operating at 32 Gbaud/s per channel, with a dispersion map designed for a 28 × 72 km link with 15% residual dispersion. Our results show that in single-channel transmission, LDBP achieves an effective signal-to-noise ratio improvement of 6.3 dB and 2.5 dB using DP-16-QAM format, respectively, over linear equalization and DBP. In WDM transmission, the corresponding Q -factor gains are 1.1 dB and 0.4 dB, respectively. Additionally, we conduct a complexity analysis, which reveals that a frequency-domain implementation of LDBP and DBP is more favorable in terms of complexity than the time-domain implementation. These findings demonstrate the effectiveness of LDBP in mitigating the nonlinear effects in DM fiber-optic transmission systems.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135768597","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}
Parity-time (PT)-symmetric optical sensors operating around exceptional points have recently gained much attraction due to their improved sensitivity for measuring small perturbations. Previously, most of the PT-symmetric sensors have been based on detecting the mode splitting that arises due to the perturbation-induced change in coupling strength between two sub-cavities of the PT-symmetric system. Here, we present a model of a fiber Fabry-Pérot linear cavities sensor tailored to operate in the broken parity-time symmetric region. We propose, what we believe to be, a new sensing metric based on the mode’s linewidth change as a function of perturbation-induced loss changes in one of the cavities. The coupling strength between the two sub-cavities remains unchanged in our proposed sensor. We derive a mathematical expression that describes a square root dependence of the full-width-half-maximum change as a function of the refractive index change-induced loss, which is introduced via a tapered fiber in one of the fiber cavities. The proposed fiber Fabry-Pérot refractive index sensor has a maximum sensitivity of 2.26 × 10 7 GHz/RIU and the lowest detection limit of 10 −9 RIU, widely outperforming comparable cavity sensors subject to the same refractive index change, gain, and loss settings.
{"title":"Modeling of a fiber Fabry-Pérot sensor in thebroken PT-symmetric region","authors":"Faiza Iftikhar, Raja Ahmad, Imran Cheema","doi":"10.1364/optcon.499236","DOIUrl":"https://doi.org/10.1364/optcon.499236","url":null,"abstract":"Parity-time (PT)-symmetric optical sensors operating around exceptional points have recently gained much attraction due to their improved sensitivity for measuring small perturbations. Previously, most of the PT-symmetric sensors have been based on detecting the mode splitting that arises due to the perturbation-induced change in coupling strength between two sub-cavities of the PT-symmetric system. Here, we present a model of a fiber Fabry-Pérot linear cavities sensor tailored to operate in the broken parity-time symmetric region. We propose, what we believe to be, a new sensing metric based on the mode’s linewidth change as a function of perturbation-induced loss changes in one of the cavities. The coupling strength between the two sub-cavities remains unchanged in our proposed sensor. We derive a mathematical expression that describes a square root dependence of the full-width-half-maximum change as a function of the refractive index change-induced loss, which is introduced via a tapered fiber in one of the fiber cavities. The proposed fiber Fabry-Pérot refractive index sensor has a maximum sensitivity of 2.26 × 10 7 GHz/RIU and the lowest detection limit of 10 −9 RIU, widely outperforming comparable cavity sensors subject to the same refractive index change, gain, and loss settings.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769284","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}
{"title":"Steady-state entanglement in a hybrid optomechanical system enhanced by optical parametric amplifiers","authors":"Abraham Kibret, T. Darge, Tesfaye Gebremariam","doi":"10.1364/optcon.502349","DOIUrl":"https://doi.org/10.1364/optcon.502349","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41829418","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}
In this work, full-field detection of laser-induced ultrasound waves was performed with an off-axis LED-based Schlieren system. Sensing strobe light, pulsed laser dual light-sheet excitation, and CMOS sensor device were all synchronized to capture the pressure wave as it propagated through an elastic liquid surrounding the test sample. In addition, a reconstruction algorithm based on the Radon transform was applied to the digitally recorded field in order to obtain an image of the photoacoustic source. The proposed system is capable of retrieving the profile of cylindrical and hexagonal targets.
{"title":"LED-based Schlieren system for full-field photoacoustic wave acquisition and image reconstruction","authors":"Yanier Ojeda-Morales, Danay Hernandez-Lopez, Geminiano Martinez-Ponce","doi":"10.1364/optcon.498143","DOIUrl":"https://doi.org/10.1364/optcon.498143","url":null,"abstract":"In this work, full-field detection of laser-induced ultrasound waves was performed with an off-axis LED-based Schlieren system. Sensing strobe light, pulsed laser dual light-sheet excitation, and CMOS sensor device were all synchronized to capture the pressure wave as it propagated through an elastic liquid surrounding the test sample. In addition, a reconstruction algorithm based on the Radon transform was applied to the digitally recorded field in order to obtain an image of the photoacoustic source. The proposed system is capable of retrieving the profile of cylindrical and hexagonal targets.","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135098517","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}
{"title":"Enhancing Signal Quality in Dense Wavelength Division Multiplexed Systems by Eliminating Crosstalk with Cascaded Optical Bandpass Filters","authors":"Changxin Rin, Hiroyuki Uenohara","doi":"10.1364/optcon.495028","DOIUrl":"https://doi.org/10.1364/optcon.495028","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42575809","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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