IJAT Vol.18 No.1 pp. 84-91
doi: 10.20965/ijat.2024.p0084

Research Paper:

Repetition Frequency Control of a Mid-Infrared Ultrashort Pulse Laser

Hiraku Matsukuma*,†, Masashi Nagaoka*, Hisashi Hirose*, Ryo Sato*, Yuki Shimizu**, and Wei Gao*

*Department of Finemechanics, Tohoku University
6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan

Corresponding author

**Division of Mechanical and Space Engineering, Hokkaido University
Sapporo, Japan

April 7, 2023
June 14, 2023
January 5, 2024
mid-infrared laser, mode-locked laser, repetition frequency, phase-locked loop

In this study, a method for controlling the repetition frequency of a mid-infrared ultrashort pulse laser with a central wavelength of 2.8 µm is developed. A ring cavity that is insensitive to the polarization state of the laser light emitted from the fiber end was constructed to stabilize the oscillation of the mid-infrared ultrashort pulse laser. More oscillation conditions for the ultrashort pulse laser based on nonlinear polarization rotation are found than the conventional method. To confirm that the pulse oscillation is mode-locked, ultrashort pulse oscillation was confirmed by an autocorrelator. The pulse repetition frequency of this robust ultrashort pulse laser was controlled. The control method was based on the phase-locked loop (PLL) control. A wedge window was inserted into the cavity and mounted on a linear stage driven by a piezoelectric transducer. By driving the piezoelectric transducer, the position of the wedge window changed, and the resulting optical path length also changed. The repetition frequency was controlled based on this principle. Optical path length control by the wedge window and temperature control provides an Allan deviation of approximately 1 mHz.

Cite this article as:
H. Matsukuma, M. Nagaoka, H. Hirose, R. Sato, Y. Shimizu, and W. Gao, “Repetition Frequency Control of a Mid-Infrared Ultrashort Pulse Laser,” Int. J. Automation Technol., Vol.18 No.1, pp. 84-91, 2024.
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Last updated on Feb. 19, 2024