Innovation Created by Light

Professor Yusuke MORI [Graduate School of Engineering, Osaka University]

As a method for extending the laser wavelength band to deep ultraviolet or mid-infrared range, we have the frequency conversion technique using nonlinear optical crystals (crystals with different wavelength between incident light and emitted light).
This lecture starts with the basics of optics and explains the principle of frequency conversion, the requirements for superior nonlinear optical crystals, and so forth.

Particularly, we focus on the CsLiB6O10 crystals (hereinafter, CLBO crystals).
The CLBO crystal, discovered in 1993 by Sasaki Laboratory (present Mori Laboratory) at Osaka University, was used to generate a UV laser beam with the world’s highest power (42W at 266nm) through frequency conversion to deep UV range having a growing demand in semiconductor industry and medical fields.
It is worth viewing a secret story behind development that a key to success is to break the conventional rules.
The lecture also introduces the principle of high-quality protein crystal growth that was made possible by the femtosecond laser irradiation and solution-stirring techniques, interdisciplinary collaboration that helped realize this invention, as well as the process of using these techniques for starting a venture company.

Professor Yusuke MORI [Graduate School of Engineering, Osaka University]

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