Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystal |
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| Affiliation: | 1. Transparent Electro-Active Materials Project, ERATO-SORST, Japan Science and Technology Agency, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;2. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;3. Frontier Collaborative Research Center, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8503, Japan |
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| Abstract: | Focused infrared femtosecond laser pulses (wavelength ∼800 nm, emission pulse duration 100 fs) were employed to fabricate optoelectronic devices such as waveguides, micro-gratings and laser active centers in LiF crystals. F2 color centers of about 2 × 1018 cm−3 and refractive index change of about 1% at 633 nm were induced by the fs-laser irradiation. This technique was applied to fabricate a distributed-feedback (DFB) F2 color center laser structure inside LiF single crystal. The LiF DFB laser exhibited laser oscillation at 707 nm at room temperature. The slope efficiency of ∼10% and beam divergence of ∼20 mrad were achieved. |
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