[Tutorial] OPIC2026 in Yokohama

国際会議The Optics and Photonics International Congress (OPIC) 2026において、宮地が超短パルスレーザー加工に関するチュートリアル講演を行います。

日時：2026年4月21日　15:00-16:00

場所：パシフィコ横浜　会議センター　4階　419室

講師：宮地悟代

タイトル：Ultrashort pulse laser material processing: How do ultrashort laser pulses work in materials?

概要：Intense laser light can provide various irreversible changes in materials, including combustion, melting, ablation, or modifications of the refractive index. Such phenomena are popularly referred to as laser material processing or simply laser processing. As the pulse duration of the laser light decreases to picoseconds or femtoseconds, the dominant interaction processes between light and matter are significantly altered, leading to distinctive characteristics. For instance, the thermal effects are minimal, resulting in so-called nonthermal processing, which leads to the formation of sharp and well-defined processed edges without melting or burning. This property enables high-precision and high-spatial-resolution material processing at the nano- to micro-scale, which has been widely adopted in various industrial applications. One significant advantage is the ability to process a wide variety of materials—from metals and semiconductors to dielectrics and even biological tissues—due to these unique light–matter interaction processes. In this tutorial, the lecturer will first explain the fundamental mechanisms of optical absorption, followed by nonlinear absorption processes induced by ultrashort laser pulses and the resultant irreversible material modifications. He will also briefly touch on what ultrashort laser pulses are and how they are generated, and finally introduce recent applications and future prospects of ultrashort pulse laser material processing.