Control of femtosecond laser pulses using a radial spatiotemporal lens and application to material processing

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656042
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: Utsunomiya University
• Principal Investigator: HAYASAKI Yoshio 宇都宮大学, オプティクス教育研究センター, 教授 (10271537)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 時空間レンズ / 2光子顕微鏡 / フェムト秒レーザー / 計算機ホログラム / 空間光変調素子 / 回折光学素子

Outline of Final Research Achievements

We firstly proposed a diffractive spatiotemporal lens with a rotationally-symmetrical structure and demonstrate the focusing characterizations evaluated by a numerical simulation. The diffractive optical element gives a good solution for making the complex and dynamic structures for controlling dispersion and wavefront compensations. The diffractive spatiotemporal lens has a concentric diffractive grating that disperses a broadband ultrashort pulse to the radial direction from z axis as a key optical parts. Therefore, it is called as a diffractive radial spatiotemporal lens. The most important feature of the DRSTL is a circularly symmetrical simultaneous spatial and temporal focusing. It has the controllability of the lateral peak intensity distribution by changing the spatial frequency of the concentric diffractive grating.

Free Research Field

光工学