KIOST 세미나

일자: 2009년 9월18일(금) 오전10:00 - 장소: 기계공학동(N7) 3층 E1세미나실 일정: 오전 10:00 - 10:10 개회사

               10:10 - 10:50  오왕렬 박사의 강연 
               10:50 - 11:00   휴식
               11:00 - 11:40  김정원 박사의 강연 
               11:40 - 12:00  KIMM-KAIST 공동기획 안내
               12:00 -          점심식사 (학과 로비,구드프랑스)

Photonic Imaging for Biomedical Applications - 오왕렬 교수 Light is uniquely well suited for non-invasive visualization of microscopic structure, molecular composition, and biomechanical properties of biological tissues. Optical imaging has recently been playing critical roles in various fields from biological studies in laboratory settings to in-vivo patient imaging in clinical environments. In this talk, I will present my recent works on novel optical imaging system development. Several key applications will be demonstrated showing how the technological innovations bring new understandings in biomedical studies and help improving public health care.

Attosecond-Precision Ultrafast Photonics: the Marriage of Ultrafast Laser and Ultraprecise Timing - 김정원 교수 Ultrashort optical pulse generation has a rich history of more than 40 years. Traditionally, ultrashort optical pulses from mode-locked lasers have been used to carry out time-resolved studies of ultrafast phenomena on the picosecond and femtosecond time scales. Recently, new insight into the frequency and noise characteristics of mode-locked lasers has initiated intense research activities in new directions. Mode-locked lasers have a unique characteristic of simultaneously generating low-noise optical and microwave signals in the form of extremely regularly-spaced optical pulse trains. In particular, the ultralow timing jitter of optical pulse trains can be used for the high-precision generation, distribution, measurement, and synchronization of optical and microwave signals. In this talk, I will present the recent progress toward the attosecond-precision ultrafast photonics based on ultralow timing jitter optical pulse trains. By leveraging the ultralow jitter of mode-locked lasers, I have pursued high-precision optical-optical and optical-microwave synchronization techniques. Optical signals spanning over 1.5 octaves were synthesized by attosecond-precision timing and phase synchronization of two independent mode-locked lasers. High-stability microwave signals were also synthesized from mode-locked lasers with drift-free sub-10 fs precision. The attosecond-precision distribution of optical pulse trains to remote locations via timing-stabilized fiber links was further demonstrated. These techniques have culminated in the large-scale, drift-free sub-10 femtosecond  synchronization over more than 10 hours, the accuracy of which is equivalent to keeping the timing with less than a second of accumulated error since the birth of the universe (13.7 billion years ago). After summarizing my previous work, I will discuss on my research plans and potential collaboration opportunities both inside and outside KAIST.