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Optics Letters

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  • Vol. 28, Iss. 5 — Mar. 1, 2003
  • pp: 328–330

Two-frequency Er-Ybglass microchip laser passively Q switched by a Co:ASL saturable absorber

N. D. Lai, M. Brunel, F. Bretenaker, B. Ferrand, and L. Fulbert  »View Author Affiliations


Optics Letters, Vol. 28, Issue 5, pp. 328-330 (2003)
http://dx.doi.org/10.1364/OL.28.000328


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Abstract

Passive <i>Q</i> switching of a two-frequency Er<sup>3+</sup>– Yb<sup>3+</sup>: glass laser at 1.55 μm with a new Co<sup>2+</sup>: La<sub><i>x</i></sub>Sr<sub>1-<i>x</i></sub>Mg<sub><i>x-y</i></sub> Co<sub><i>y</i></sub>Al<sub>12-<i>x</i></sub>O<sub>19</sub> crystal as a saturable absorber is demonstrated. We show that, with an extended cavity setup, the beat frequency between the orthogonally polarized laser eigenstates is continuously tunable by adjustment of the retardance of an intracavity birefringence. A similarly built microchip laser emits two-frequency pulses of 6-ns duration with a beat frequency of as much as 19 GHz. Moreover, two-frequency pulses at 777 nm are obtained by second-harmonic generation in a periodically poled lithium niobate crystal. Such pulses can be useful for applications such as Doppler lidar radar.

© 2003 Optical Society of America

OCIS Codes
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(160.3380) Materials : Laser materials
(280.3640) Remote sensing and sensors : Lidar

Citation
N. D. Lai, M. Brunel, F. Bretenaker, B. Ferrand, and L. Fulbert, "Two-frequency Er-Ybglass microchip laser passively Q switched by a Co:ASL saturable absorber," Opt. Lett. 28, 328-330 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-5-328


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