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Optics Letters

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  • Vol. 29, Iss. 10 — May. 14, 2004
  • pp: 1075–1077

Efficient 1645-nm Er:YAG laser

York E. Young, Scott D. Setzler, Kevin J. Snell, Peter A. Budni, Thomas M. Pollak, and E. P. Chicklis  »View Author Affiliations


Optics Letters, Vol. 29, Issue 10, pp. 1075-1077 (2004)
http://dx.doi.org/10.1364/OL.29.001075


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Abstract

We report a resonantly fiber-laser-pumped Er:YAG laser operating at the eye-safe wavelength of 1645 nm, exhibiting 43% optical efficiency and 54% incident slope efficiency and emitting 7-W average power when repetitively Q switched at 10 kHz. To our knowledge, this is the best performance (conversion efficiency and average power) obtained from a bulk solid-state Q -switched erbium laser. At a 1.1-kHz pulse repetition frequency the laser produces 3.4-mJ pulses with a corresponding peak power of 162 kW. Frequency doubling to produce 822.5-nm, 4.7-kW pulses at 10 kHz was performed to demonstrate the laser’s utility.

© 2004 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3540) Lasers and laser optics : Lasers, Q-switched
(280.3400) Remote sensing and sensors : Laser range finder

Citation
York E. Young, Scott D. Setzler, Kevin J. Snell, Peter A. Budni, Thomas M. Pollak, and E. P. Chicklis, "Efficient 1645-nm Er:YAG laser," Opt. Lett. 29, 1075-1077 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-10-1075


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References

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  10. With a pulse width of 21 ns this corresponds to an intracavity fluence of 8 J/cm 2, corresponding to an intracavity fluence of 5.5 J/cm 2 for a 10-ns pulse width using a square-root time dependence for the damage threshold, which is notably lower than the typical 10-J/cm 2 damage threshold usually quoted for coated optics. The requirement that this dichroic be highly reflective for 1.64 and highly transmissive for 1.53mm necessitated the use of more layers than are typically used in standard coatings, reducing the dichroic’s damage threshold from what may normally be expected in an ordinary coating.
  11. SHG was not attempted with the 4-cm Er:YAG crystal in the laser.
  12. M. M. Fejer, G. A. Magel, D. H. Jundt, and R. L. Byer, IEEE J. Quantum Electron. 28, 2631 (1992).
  13. D. H. Jundt, Opt. Lett. 22, 1553 (1997).

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