As announced the other day, the 2018 Nobel Prize in Physics was given for the development of optical tweezers and ultrashort pulse lasers. Optical technology is constantly advancing and penetrating into various industrial fields. Recently, the power of fiber lasers is remarkably increasing, and therefore, it becomes a promising processing tool for metalworking and its marketing value is also increasing. In addition, now we already have many processes that cannot be done without laser, and this trend will continue in the future. However, we often hear from potential users of optical technology who work at machining, "I understand the importance of optical technology, but I am hesitating to introduce because I do not know how to use". This is the same from the actual feeling as an optical researcher of me, and I feel the lack of optical engineers who realize new technological ideas. In other words, the current state of the industry is in short supply of optical engineers. As a factor of short supply of optical engineers, mostly optical education is often in charge of the Department of Electrical and Electronic Engineering, Faculty of Engineering at Japanese universities, and therefore, most of the students that have learnt optics are employed as electrical/electronic engineers after graduation. Meanwhile, it is also true that efforts to resolve at various universities have begun. While introducing our optical education (student experiment: Control of polarization state), we will examine optical education at university and its role for the optical industry.
Cherenkov phase-matching terahertz-wave generation is attractive way of efficient THz-wave generation. Efficient THz-wave generation by nonlinear optics has two problems, strong absorption and strong dispersion of many crystals. These problems can be overcome by Cherenkov phase matching. We successfully demonstrated wide tunable monochromatic THz-wave generation about from 0.2 to 7.2 THz using waveguided lithium niobate crystal. The Cherenkov process is useful for novel THz-wave detection method. THz-wave and optical waves in nonlinear optical process are strongly correlated. Thus, THz-wave information can transfer to pump and signal wave. THz-wave generated by Cherenkov phase matching can be used as evanescent-probe at interface facet of the crystal. Phase shift and attenuation of reflected THz-wave has information of a sample set at the interface, so the information can be detected by optical analysis for pump and signal wave.
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