Intense UV-pulse source using quasi phase matched quartz

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05317
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: ISHIZUKI Hideki 国立研究開発法人理化学研究所, 放射光科学研究センター, 研究員 (90390674)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 水晶 / 擬似位相整合 / レーザー / 紫外光 / 極性反転

Outline of Final Research Achievements

Crystal quartz is one of major optical materials because of its excellent optical and mechanical properties. Also, crystal quartz is well known as a nonlinear material used for the first demonstration of second-harmonic generation (SHG). Although its practical use by conventional birefringent phase matching scheme has been prevented because of its small birefringence, an artificial control of nonlinear coefficient enables crystal quartz both efficient and arbitrary wavelength conversions, which is called a quasi phase matching (QPM).
In this research, we proposed and realized a stress-induced polarity inversion of crystal quartz using a QPM stamp method. Periodic polarity inversion of crystal quartz could be demonstrated using a periodically patterned QPM stamp. QPM-SHG characteristics was evaluated by a sub-ns pulse-laser-pumped experiments.

Free Research Field

非線形光学

Academic Significance and Societal Importance of the Research Achievements

従来のガスレーザーによる紫外レーザー光源や、大型のランプ励起レーザー励起光源を置き換える、小型高安定な高出力全固体式UVパルス光源を実現するため、水晶という古いからあるが波長変換素子材料としては有効利用されてこなかった結晶を用いた擬似位相整合（QPM）に基づく波長変換素子を実現する。