Research Overview 
ultralow-noise fs lasers 
and comb sources 
timing and synch for 
ultrafast science 
ultrafast, ultra-precise 
TOF sensing and imaging 
photonic on-chip 
clock distributions 
optical metrology for 
semiconductor manufacturing 

We pursue ultrahigh-precision measurement and control engineering enabled by advanced ultrafast lasers. Today's ultrafast lasers can generate an extremely regularly spaced train of optical pulses with ultrashort pulsewidth, ultrabroad optical spectra, and ultrahigh peak power. Although the ultrafast laser-based science has been a huge success, the fundamental potentials enabled by such lasers have not yet been fully exploited. In particular, ultralow-noise properties of ultrafast lasers can open up new opportunities in various science and engineering areas that require ultrahigh-precision measurement and control capabilities, ranging from accelerator-based light sources through low-noise signal generators to remote sensing and industrial metrology.

Our goal is to achieve world-class performance in noise and stability of ultrafast lasers and develop new photonic technologies based on such ultrafast and ultralow-noise lasers. We have further interest in developing more robust, compact, low-noise ultrafast lasers and opening up new application areas. In the coming years, we believe that the rapid convergence of ultrafast and ultralow-noise lasers, precision measurement and control, and integrated photonic systems will unveil exciting opportunities to new directions.

Our current research has five major research areas (click each item for more information):
(1) Ultralow-noise femtosecond lasers and frequency comb sources
(2) Timing and synchronization for ultrafast science and radio astronomy
(3) Ultrafast and ultra-precise time-of-flight (TOF) sensing
(4) Photonic on-chip clock distribution networks and signal processing
(5) Optical metrology for semiconductor device manufacturing

Our recent research results have been not only published at high-impact journals including Nature Photonics, Nature Communications, Science Advances, and Optica, but also actively applied for high-tech industries including Quantum Technology (on-chip frequency synthesizers), ICT & AI (photonic clock distribution and data converters), Defense (photonics-based radars), and Semiconductor Manufacturing (sensing and imaging for semiconductor device manufacturing processes). Thanks to the multidisciplinary nature of our research, we also enjoy a wide range of domestic and international collaboration opportunities with academia, national labs, and industries.

Our research has been supported by the following funding agencies and companies.
* National Research Foundation (NRF) of Korea - Mid-Career Research Program [previous National Research Laboratory (NRL) Program] (2018-2024); Engineering Research Center (ERC) Program (2021-2028)
* Samsung Electronics Incubation Center for Future Technology - Creative ICT Project (2017-2024)
* Institute of ICT Planning & Evaluation (IITP) of Korea - Quantum Sensor Technology Program (2019-2022)
* Hanwha Systems Co - ADD Future Technology Project (2021-2025)
* Kohyoung Technology Inc - Industry-Academia Project (2020-2021)
* Poongsan-KAIST Future Technology Research Center - Industry-Academia Project (2021)

* National Research Foundation (NRF) of Korea - Young Researchers Program (2010-2013); Mid-Career Core Research Program (2012-2018); Space Technology Development Program (2013-2018)
* National Research Council of Science and Technology (NST) of Korea - Convergence Pilot Study (2020-2021)
* Samsung Electronics Memory Manufacturing Operation Center - Industry-Academia Project (2016-2019)
* Korea Atomic Energy Research Institute (KAERI) - KAERI-UED Facility Project (2013-2020)
* Small and Medium Business Administration (SMBA) of Korea - Technology Innovation Program (2017-2019)
* Ministry of Trade, Industry and Energy (MOTIE) of Korea - Industrial Cooperation Region Project (2015-2018)
* KAIST - End-Run Biz-Idea Development Project (2014-2015); K-Valley RED&B Project (2015-2016)
* Korea Research Institute of Standards and Science (KRISS) - WCL Program (2013-2015)
* Pohang Accelerator Laboratory (PAL) - PAL-XFEL Project (2010-2013)
* Agency for Defense Development (ADD) of Korea - Optical Detection Sensor Project (2013)
* Ministry of Knowledge and Economy (MKE) of Korea - Technology Innovation Program (2011-2012)

[Panoramic views of the main laboratory (Room 6119)]

[Chip test laboratory (Room 6120)]