Welcome to LEAL

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  Laser Engineering & Applications Laboratory (LEAL), led by Dr Yoonchan Jeong, explores the outer reaches of photonics science and technology, especially, in high-power and high-energy regimes. The research foci are on developing innovative lasers and photonic systems and also on providing novel and powerful solutions to the related applications. The main research interests include Generation of High-Power / High-Energy Photons, Photon-Photon / Photon-Electron / Photon-Phonon Energy Conversions, Photon-Molecule Interactions, and related many interesting applications, such as Lidar, Laser Sonar, Remote Sensing, Space Optical Communication, Display, Nano-Biomedical applications, Technology Textiles, etc.

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News

  • K. Park and J. Na won 'Best Poster Award' and 'Best Paper Award' at 2018 ICAIT held in Royal Institute of Technology, Sweden. ORC director, Sir David payne who developed EDFA awarded the prizes.

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  • Article "Intermittent Burst of a Super Rouge Wave in the Breathing Multi-Soliton Regime of an Anomalous Fiber Ring Cavity" written by Seungjong Lee and Yoonchan Jeong is featured on "Advances in Engineering".

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  • K. Park won the 'Best Poster Award' at COOC 2018 in Daegu with title "Brillouin scattering induced transparency and slow-light effect in As2Se3".

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  • To commemorate the first International Day of Light, optical seminar was held under the auspices of the OSA Student chapter at Seoul National University on May 16, 2018.

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  • The "2018 Teacher's Day" celebration for our professor Y. Jeong was held on May 15th.

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  • Our student Jinseob Kim recieved the "International Day of Light" award as a representative of Korea.

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  • Our lab has signed a contract MoU (Memorandum of Understanding) with Prof. Peter Vasil'ev at the Photonics Group of Cambridge University.

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  • Article "Spatio-Temporal Analysis on Shot-to- Shot Coherence and Wave-Packet Formation in Quasi-Mode Locked Regimes in Anomalous Dispersion Fiber Ring Cavity" written by Seungjong Lee and Yoonchan Jeong is featured on "Advances in Engineering".

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  • Professor Jeong received the best lecturer award for Fall 2017. Lecture Award.png   

  • Our lab got new student Minsu Yeo, Hyukjin Yang, Hyungu Kang.

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  • LEAL awards ceremony was held on Feb. 18.

  • Research professor Luis Alonso Vazquez-Zuniga got a new job at Calmar Laser and received a certification of apreaciation from Y. Jeong.

  • Our student S. Lee received the best student paper award for COOC 2016 conference.

  • Professor Jeong received the best lecturer award for Spring 2015.

  • Our student Y. Kwon received the best student paper award for COOC 2014 conference.

  • "Adaptive broadband continuum source at 1200-1400nm based on an all-fiber dual-wavelength master- oscillator power amplifier and a high-birefringence fiber" is posted to the OCT news article.

  • "Adaptive broadband continuum source at 1200-1400nm based on an all-fiber dual-wavelength master- oscillator power amplifier and a high-birefringence fiber" is also selected as the paper of the Virtual Journal of Biomedical Optics.

  • Our student K.Park received the best student paper award for ALTA 2013 conference.



Spatiotemporal Laser speckle flowmetry based on elastic-walled U-shaped tubing apparatus: Optical method for urinary flow measurement


S. Hong, H. Kim, K. Park, Y. Kwon, H. Chang, S. Piao, Y. Lee, S. Oh and Y. Jeong.

vol 57, no. 10, pp. 104110, 2018, Optical Engineering

 

 Abstract : We propose an optical method for uroflowmetry, exploiting the laser speckle contrast imaging (LSCI) technique onto an intermediate tubing apparatus having an elastic wall that can sensitively respond to flowinduced shedding vortices. Based on the method, we devised and fabricated an elastic-walled U-shaped tubing apparatus (EWUSTA), using the three-dimensional printing technique. We utilized the spatiotemporal contrast scheme for the LSCI as a fast and reliable computational algorithm. We investigated three different materials of flex-vinyl, ninja-flex, and natural rubber latex for the elastic wall of the EWUSTA in steady flow conditions, and verified that their optimal operational ranges could extend up to 7, 15, and 25 ml/s, respectively. We characterized the natural-rubber-latex-based EWUSTA in dynamic flow conditions in comparison with a commercial reservoir-weight-transducer-based gravimetric flowmeter, and verified its feasibility. We stress that the proposed method can offer precise and accurate information on flow dynamics. In addition, we found that the upper limit of the optimal operational range of the proposed apparatus had strong correlation with the tensile strength of the elastic-wall material. We reckon that the proposed and demonstrated method has great potential not only for uroflowmetry but also for other flow-related medical and industrial applications.

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