Red and Green Distributed-Feedback LiF Color Center Lasers Fabricated by Interference of Femtosecond Laser Pulses

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  • OBAYASHI Yoshihiro
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • KUROBORI Toshio
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • HIROSE Yukio
    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192
  • SAKAI Toshiaki
    Central Research Laboratory, Hamamatsu Photonics K. K., 5000 Hirakuchi, Hamakita-ku, Hamamatsu 434-8601
  • AOSHIMA Shin-ichiro
    Central Research Laboratory, Hamamatsu Photonics K. K., 5000 Hirakuchi, Hamakita-ku, Hamamatsu 434-8601

Abstract

Sub-micron periodic gratings inside bulk lithium fluoride (LiF) are holographically fabricated by interference with the second harmonic (390 nm) of a mode-locked Ti:sapphire oscillator-amplifier laser. As one optoelectronic application, pulsed, room temperature distributed feedback (DFB) color center laser action is demonstrated, for the first time, in the green spectral region based on the F3+ color centers in LiF utilizing both a micro-structure encoded by femtosecond-laser-pulses, and higher gain of the laser-active centers produced by an e-ray irradiation at 200 K. A lasing output with a linewidth of 0.5 nm is obtained at approximately 537 nm, which value reflects the selective laser resonator. Realization of green and red DFB color center lasers based on the F3+ and F2 centers in LiF excited by a single wavelength can be expected.

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