Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals

Laser-active F2 centers were produced in lithium fluoride (LiF) at a concentration of 2×1018 cm−3 by irradiating focused femtosecond (fs) laser pulses from a mode-locked titanium sapphire laser (wavelength ∼800 nm, emission pulse duration ∼100 fs). This technique was used to write waveguides embedde...

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Veröffentlicht in:Applied physics letters 2004-01, Vol.84 (3), p.311-313
Hauptverfasser: Kawamura, Ken-ichi, Hirano, Masahiro, Kurobori, Toshio, Takamizu, Daizyu, Kamiya, Toshio, Hosono, Hideo
Format: Artikel
Sprache:eng
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Zusammenfassung:Laser-active F2 centers were produced in lithium fluoride (LiF) at a concentration of 2×1018 cm−3 by irradiating focused femtosecond (fs) laser pulses from a mode-locked titanium sapphire laser (wavelength ∼800 nm, emission pulse duration ∼100 fs). This technique was used to write waveguides embedded in LiF crystals. A refractive index change estimated from a guide propagation method was approximately +1% at a wavelength of 633 nm. Refractive index-modulated volume-type gratings were also encoded inside LiF crystals by a single interfered fs laser pulse. The distributed feedback laser structure was fabricated using the gratings thus encoded, which exhibited a room-temperature F2-color center laser oscillation at 707 nm. This demonstrates a DFB color center laser operating at room temperature utilizing photon written, permanent Bragg gratings.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1640784