Red and Green Distributed-Feedback LiF Color Center Lasers Fabricated by Interference of Femtosecond Laser Pulses
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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 F<sub>3</sub>+ 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 F<sub>3</sub>+ and F<sub>2</sub> centers in LiF excited by a single wavelength can be expected.
- The Review of Laser Engineering
The Review of Laser Engineering 36(APLS), 1226-1229, 2008
The Laser Society of Japan