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Optimization of Diode-pumped Cesium Vapor Laser Using Frequency Locked Pump Laser
Seongjin Hong,Byungjoo Kong,Yong Soo Lee,Kyunghwan Oh 한국광학회 2018 Current Optics and Photonics Vol.2 No.5
We propose a diode-pumped cesium laser using frequency locking of a pump laser that can effectively increase the maximum output power of the cesium laser. We simultaneously monitored the absorption spectrum of cesium and the laser output power, and the frequency of pump laser was locked at the center of the D2 absorption line of the cesium atom to obtain an effective gain enhancement. Using this scheme, we have achieved output power increase of ~0.1 W compared to when frequency locking was not applied. Furthermore, by optimizing the temperature of the cesium cell and the reflectivity of the output coupler, we successfully achieved an output power of 1.4 W using the pump power of 2.9 W, providing a slope efficiency of 61.5% and optical-to-optical efficiency of 49%.
Nazari, Tavakol,Khazaeinezhad, Reza,Jung, Woohyun,Joo, Boram,Kong, Byung-Joo,Oh, Kyunghwan Optical Society of America 2015 Optics express Vol.23 No.14
<P>Dual resonant bands in UV and the visible range were simultaneously observed in the enhanced optical transmission (EOT) through star-shaped plasmonic structures. EOTs through four types of polygonal bull's eyes with a star aperture surrounded by the concentric star grooves were analyzed and compared for 3, 4, 5, and 6 corners, using finite difference time domain (FDTD) method. In contrast to plasmonic resonances in the visible range, the UV-band resonance intensity was found to scale with the number of corners, which is related with higher order multipole interactions. Spectral positions and relative intensities of the dual resonances were analyzed parametrically to find optimal conditions to maximize EOT in UV-visible dual bands.</P>
Lee, Jaesung,Park, Jonghan,Park, Jangmi,Lee, Chamkyul,Jeong, Suhyeon,Kong, Kyunghwan,Lee, Eunyong The Society of Korean Medicine 2019 대한한의학회지 Vol.40 No.4
Objectives: The objective of this study was to report the general characteristics, satisfaction, and changes before and after treatment to foreign athletes and officials who were received Korean Medicine at the 2019 Chungju World Martial Arts Masterships Korean Medical Clinic. Methods: We investigated age, gender, nationality, type of sports, and, onset through medical records. Besides, we developed the patient satisfaction survey to determine how satisfied the patients were with the treatment they received. The survey included type of injury, location of the injury, cause of injury, Numeric Rating Scale (NRS) before and after treatment, and treatment satisfaction. Result: This study showed that knee and lower leg injuries (S80-S89) were the most frequent injuries in the Korean Medicine(KM) clinic of the 2019 Chungju World Martial Arts Masterships. We provided KM treatments including acupuncture, cupping therapy, Chuna manual therapy, herbal medicine, dressing, and taping. Acupuncture was the most frequently performed and the most satisfactory treatment. The average NRS after treatment significantly decreased, suggesting that KM is effective in controlling pain in sports injuries. The overall satisfaction was also high with KM treatments.
고호연,배광호,박선영,이주아,공경환,신미란,이승언,선승호,정희,박선주,고성규,이동녕,Go, Hoyeon,Bae, Gwangho,Park, Sunyoung,Lee, Juah,Kong, Kyunghwan,Shin, Miran,Lee, Seung-Eon,Sun, Seung-Ho,Jung, Hee,Park, Sunju,Ko, Seong-Gyu,Lee, Dongny 대한중풍순환신경학회 2009 대한중풍.순환신경학회지 Vol.10 No.1
Objectives : The study was aimed to survey participant's characters in stroke prevention & Gigong program Methods : The data were collected 34 participants in stroke prevention & Gigong program. The questionnaires to survey characters in stroke prevention & Gigong program composed demographic item, past history, family history, stroke presymptoms, etiology, prevention, why join of Gigong program, etc. Results : Half of participants didn't know anything presymptoms, prevention for stroke. Conclusion : From these results, stroke education program have been improvement and it is needed further study to survey efficacy to stroke education program.