Magnetic domains driving a Q-switched laser

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Morimoto, Ryohei
Goto, Taichi
Pritchard, John
Takagi, Hiroyuki
Nakamura, Yuichi
Lim, Pang Boey
Uchida, Hironaga
Taira, Takunori
Inoue, Mitsuteru
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Springer Nature
Mina, Mani
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Industrial Design
The Department of Industrial Design seeks to teach students to tap creativity for the design of products, systems or services that meet commercial objectives in business and industry. The Industrial Design Program was established in the Department of Art and Design in 2010. In 2012, the Department of Industrial Design was created.
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Electrical and Computer Engineering

The Department of Electrical and Computer Engineering (ECpE) contains two focuses. The focus on Electrical Engineering teaches students in the fields of control systems, electromagnetics and non-destructive evaluation, microelectronics, electric power & energy systems, and the like. The Computer Engineering focus teaches in the fields of software systems, embedded systems, networking, information security, computer architecture, etc.

The Department of Electrical Engineering was formed in 1909 from the division of the Department of Physics and Electrical Engineering. In 1985 its name changed to Department of Electrical Engineering and Computer Engineering. In 1995 it became the Department of Electrical and Computer Engineering.

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  • Department of Electrical Engineering (1909-1985)
  • Department of Electrical Engineering and Computer Engineering (1985-1995)

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A 10-mm cavity length magnetooptically Q-switched Nd:GdVO4 laser was demonstrated using a single-crystalline ferrimagnetic rare-earth iron garnet film. To design the Q-switching system, the magnetic, optical, and magnetooptical properties of the garnet film were measured. The diode pumped solid-state laser cavity was constructed using a 190-μm-thick garnet film with 58% transmittance. The garnet film had maze-shaped magnetic domains, and the domain walls disappeared when a field of over 200 Oe was applied. Therefore, the polarization state of the transmitted light was modified by modulating the magnetization, and a Q-switched pulse output with a pulse width of 5 ns and peak power of 255 W was achieved in the 10-mm-long cavity. The physical limitation of the pulse width was discussed with the calculated results.
This article is published as Morimoto, Ryohei, Taichi Goto, John Pritchard, Hiroyuki Takagi, Yuichi Nakamura, Pang Boey Lim, Hironaga Uchida, Mani Mina, Takunori Taira, and Mitsuteru Inoue. "Magnetic domains driving a Q-switched laser." Scientific Reports 6, no. 1 (2016): 1-7. DOI: 10.1038/srep38679. Copyright 2016 The Author(s). Attribution 4.0 International (CC BY 4.0). Posted with permission.