Single-shot measurement of irreversible changes using gain-switched semiconductor laser

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20346
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Kobayashi Masataka 東京大学, 物性研究所, 助教 (30911838)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 利得スイッチ / 半導体レーザー / シングルショット / 不可逆現象 / 超高速分光

Outline of Final Research Achievements

In this study, we were able to construct a pulse power supply device for carrier injection, which is the cornerstone of a "multitime-scale single-shot spectroscopic system" capable of observing all irreversible change dynamics occurring over a wide range of time scales in a single spectroscopic system by combining a gain-switched semiconductor laser with flexible selectivity in pulse shaping and repetition rate achieved by innovative drive electronics, and a single-shot spectroscopic method that can observe irreversible phenomena such as laser processing. We have also constructed a pulse amplification system for gain-switched semiconductor lasers using Yb-doped fiber amplification (YDFA).

Free Research Field

レーザー分光

Academic Significance and Societal Importance of the Research Achievements

利得スイッチ半導体レーザーは、他の固体レーザーやファイバーレーザーなどに比べて、パルス整形や繰り返し速度の柔軟な選択性を有し、小型で安定、堅牢、高効率、加えて低価格であり環境耐性や長寿命を有するといった特徴を持つ。そのため工場や病院等の非クリーンな環境下で、超高速かつ不可逆測定が可能なレーザー分光装置の安定的な運用には、利得スイッチ半導体レーザーの活用が有効である。本研究は、その社会実装に向けた基礎的な原理の検証を行うことができた。