Real-time control of molecular conformational dynamics using phase-programmed fiber laser system in the visible

2014 Fiscal Year Final Research Report

• Project/Area Number: 24244064
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: MISAWA Kazuhiko 東京農工大学, 工学(系)研究科(研究院), 教授 (80251396)
• Co-Investigator(Kenkyū-buntansha): TAKADA Hideyuki 独立行政法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (50357357) ; SUZUKI Takayuki 明治大学, 理工学部, 准教授 (80539510) ; TORIZUKA Kenji 独立行政法人産業技術総合研究所, 電子光技術研究部門, グループ長 (30357587)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 超高速ファイバーレーザー / 可視域位相制御光源 / コヒーレント制御 / 利得狭窄補償

Outline of Final Research Achievements

Ultrashort pulses are widely used for investigating ultrafast phenomena in a variety of molecules by utilizing its ultrashort pulse duration. Yb-doped fibers have attracted attention owing to the high pumping efficiency and broad fluorescence bandwidth. However, pulse duration is limited to >100 fs because of the gain-narrowing effect during energy amplification.

We have developed a broadband chirped pulse amplifier system at 1 μm with a gain-narrowing compensator. We designed filters made of multiple dielectric layers. The amplified pulses had broad (1020-1080 nm) bandwidth by effective compensation of the gain-narrowing effect. The dispersion of the output pulse was measured by two-dimensional spectral shearing interferometry and compensated by the grating pair and spatial light modulator. The two-stage amplification system with filters generated 65-fs, 100-nJ, and 3-MHz pulses directly from the amplifier, allowing ultrafast spectroscopy at 1 μm and frequency-doubled 500 nm.

Free Research Field

超高速光科学