Development of ultrabroadband optical vortex source

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15197
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Lin Yu-Chieh 国立研究開発法人理化学研究所, 光量子工学研究センター, 研究員 (00752073)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: singular optics / ultrafast optics / laser technology

Outline of Final Research Achievements

In order to meet an increasing demand for applications of optical vortices with a variety of wavelength ranges, this research successfully realized the development of a table-top achromatic (multi-color) vortex source with wavelength range continuously spanning from 2400 nm to 900 nm (short-wave infrared, SWIR).
During this period, I also developed a technique for controlling the carrier-envelope phase (CEP) of single-cycle pulses (Opt. Express, 30, 10818, 2022) and this technique was further combined with the generation of the broadband vortex source in the SWIR region. A CEP controllable, over-octave bandwidth, SWIR vortex source was successfully generated. This light source is expected to provide new applications and ideas in the fields of singular and ultrafast optics.

Free Research Field

光工学および光量子科学関連

Academic Significance and Societal Importance of the Research Achievements

The more than a century old Sagnac interferometer is put to first of its kind use to generate optical vortex with more than an octave bandwidth. This combination leads to a high quality vortex pulse than ever reported literatures.