Research Overview 
ultralow-noise fs lasers 
and comb sources 
microwave photonics 
timing control for ultrafast 
electron and X-ray sources 
industrial applications and 
commercialization of fs lasers 

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. These multidimensional characteristics have recently created tremendous impacts in various areas, including high-field physics, frequency metrology, and biomedical imaging. 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 applying them to new areas in (a) multi-sensing and imaging systems, (b) defense and space systems, (c) ICT and signal processing systems, and (d) industrial metrology systems for advanced manufacturing. 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 four major research areas: (1) ultralow-noise femtosecond laser and comb sources; (2) femtosecond laser-based microwave photonics; (3) timing metrology and control for ultrafast electron and X-ray sources; (4) industrial applications and commercialization of femtosecond lasers.

We gratefully acknowledge current and previous financial support for our research from

* National Research Foundation (NRF) of Korea - Young Researchers Program (2010-2013); Mid-Career Core Research Program (2012-2018); Space Technology Development Program (2013-2018); Mid-Career Research Program Type-3 [prev. National Research Lab] (2018-2021)
* Ministry of Trade, Industry and Energy (MOTIE) of Korea - Encouragement Program for Industries of Economic Cooperation Region (2015-2018)
* Small and Medium Business Administration (SMBA) of Korea - Program for Innovative Technology of Small and Medium Business (2017-2019)
* Ministry of Knowledge and Economy (MKE) of Korea - Technology Innovation Program (2011-2012)
* Pohang Accelerator Laboratory (PAL) - PAL-XFEL Project (2010-2013)
* Korea Research Institute of Standards and Science (KRISS) - WCL Program (2013-2015)
* Korea Atomic Energy Research Institute (KAERI) - WCI-KAERI Accelerator Project (2013-2020)
* SKKU Chemical and Biological Detection Research Center - Optical Detection Sensor Project (2013)
* KAIST - End-Run Biz-Idea Development Project (2014-2015); K-Valley RED&B Project (2015-2016)
* Samsung Electronics Co., Ltd. - Memory Manufacturing Operation Center Project (2016-2019)
* Samsung Electronics Future Research Center (SFRC) - Creative ICT Project (2017-2020)

[Snapshots of state-of-the-art experimental setups in our laboratory, all home-built by our capable student researchers]