Prof. Yung-Fu Chen visited the School of Information Science and Engineering，Shandong University as a mobile professor recently.
Prof. Yung-Fu Chen is currently in the Department of Electrophysics, National Chiao Tung University, Taiwan, China. He received his Bachelor degree in 1990 from NCTU, Hsinchu, Taiwan, China, in electronics engineering and Ph.D. degrees at the Institute of Electronics, National Chiao Tung University in 1994. In 1994, he entered Precision Instrument Development Center (PIDC), National Science Council, Taiwan, China where his research mainly concerned the development of diode-pumped solid-state laser as well as quantitative surface analysis of electron spectroscopy. In 1999, he became an Associate Professor in Department of Electrophysics at National Chiao Tung University (NCTU), Hsinchu, Taiwan, China. Since 2002, he has been a Professor in Department of Electrophysics at NCTU.
His research topics include laser physics, nonlinear optics, quantum theory, scattering theory, and computer simulation. He has done excellent research work in his research areas. Since 1992, he has published more than 170 papers as the first author or the corresponding author. Within the recent five years, there have been 55 papers published. According to the data of the SIS Web of Science up to 12/20/2010, the total citations for his papers exceeded 2818 times and the H-index was 31.
During his visiting, Prof. Yung-Fu Chen gave a series of lectures for young teachers and graduate students.
1 “Mode locking of multi-dimensional laser geometric modes”. High-repetition rate mode-locking laser has many applications in optical clock, micro-machine, High-speed electro-optic sampling and so on. Prof. Yung-Fu Chen introduced the principle of mode-locking laser. He showed their experimental results in one-dimensional, two-dimensional and three-dimensional mode-locked lasers and gave corresponding explanations.
2 “Diode-pumped crystal and fiber lasers for design of eye-safe lasers”. Lasers with emission wavelengths longer than 1.4 μm usually fall in this category of "eye-safe", because light in that wavelength range is strongly absorbed in the eye's lens and thus cannot reach the sensitive retina. The band of wavelengths around 1.5 μm is of great interest. These lasers can be used for range finder applications as there is an atmospheric window for this wavelength. Prof. Yung-Fu Chen introduced four methods for eye-safe lasers around 1.5 μm generation including OPO, SRS, Er3+, Yb3+ fiber lasers and optically pumped semiconductor lasers.
3 “Physics and technology of pulsed fiber laser”. Since the first fiber laser was invented in 1961, fiber lasers have attracted much attention for they have wide applications in material processing, medicine, military affairs and so on. Prof. Yung-Fu Chen introduced their experimental results in passively Q-switched PCF lasers and passively Q-switched DCF lasers. Prof. Yung-Fu Chen patiently answered the questions and discussed with the teachers and students.
4 “Investigations of spontaneous emission and spatial-temporal dynamics in broad-area vertical-cavity surface-emitting lasers: manifestation of quantum chaos”. Prof. Yung-Fu Chen introduced the spontaneous emission spectra of VCSELs. He patiently explained the near-field patterns of VCSELs and far-field patterns of VCSELs.
5 “Generation of structured laser beams: pattern formation, quantum physics, singular optics”. Prof. Yung-Fu Chen introduced the relation between quantum harmonic oscillator and laser cavity, the relation between classical harmonic oscillator and periodic orbits in laser cavity. The research not only helps us to understand the importance relation between the classical physics and quantum physics but also provides a useful insight to the mesoscopic regime.