Development of high stable optically pumped two-color far-infrared laser with back-talk less for plasma diagnostics

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K04984
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Chubu University
• Principal Investigator: NAKAYAMA Kazuya 中部大学, 工学部, 准教授 (40434584)
• Co-Investigator(Kenkyū-buntansha): 秋山 毅志 核融合科学研究所, ヘリカル研究部, 准教授 (80370138)
• Research Collaborator: OKAJIMA Shigeki
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 遠赤外レーザー / プラズマ計測

Outline of Final Research Achievements

A far-infrared laser with a wavelength of about 50μm is suitable as a light source for measuring the electron density and internal magnetic field distribution of future fusion plasma devices. Stabilization of laser oscillation is important to realize highly accurate and highly reliable plasma diagnostics. In the optically pumped far-infrared laser, removal of the return of the pump light(back-talk) has been a problem for many years. In this study, we have demonstrated stable oscillation of the 48-, 57-μm CH3OD lasers pumped by 9R(8) CO2 laser using the developed optical isolator, and established its stabilization technology.

Free Research Field

レーザー工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，未だ確立した高精度計測用レーザー光源のない波長50μm帯(周波数5 THz帯)の遠赤外領域において，高出力かつ高安定なレーザー発振を，しかも2波長同時発振で実現するというものである。本研究による成果は，レーザープラズマ計測以外の学術分野(例えば，遠赤外領域の要素技術や計測システム開発研究，標準研究，固体物性研究，分子分光研究など)の進展にも貢献できる。