[8a-N221-1~12] 3.6 Laser processing

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8a-N221-3] Interferometric observation of femtosecond laser-induced secondary nucleation of urea crystal

〇Yuka Tsuri^1,2, Mihoko Maruyama³, Katsuo Tsukamoto⁴, Hiroshi Yoshikawa³, Yoichiroh Hosokawa^1,2 (1.Div. Mat. Sci., NAIST, 2.MLC, NAIST, 3.Grad. Sch. Eng., Osaka Univ., 4.Grad. Sch. Sci., Tohoku Univ.)

Keywords:

Crystallization,Organic compouds,High-speed observation

When a femtosecond laser is focused on a urea crystal in a supersaturated solution through an objective lens, the crystal fragments are scattered, inducing secondary nucleation. In this study, we focused on this laser-induced secondary nucleation process, the spatiotemporally controlled crystallization phenomenon, and performed a high-speed interferometric observation using a Mach–Zehnder interferometer. As a result, we successfully quantified the local concentration decrease associated with the growth of fine crystal fragments during the early stage of crystallization, based on the distortion of interference fringes.