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

Kawamura, Ken-ichi; Hirano, Masahiro; Kurobori, Toshio; Takamizu, Daizyu; Kamiya, Toshio; Hosono, Hideo
January 2004
Applied Physics Letters;1/19/2004, Vol. 84 Issue 3, p311
Academic Journal
Laser-active F[sub 2] centers were produced in lithium fluoride (LiF) at a concentration of 2×10[sup 18] cm[sup -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 F[sub 2]-color center laser oscillation at 707 nm. This demonstrates a DFB color center laser operating at room temperature utilizing photon written, permanent Bragg gratings. © 2004 American Institute of Physics.


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