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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 12 — Dec. 1, 2006
  • pp: 2494–2502

Broadly tunable laser operation near 2 μ m in a locally disordered crystal of Tm 3 + -doped NaGd ( WO 4 ) 2

José M. Cano-Torres, María Dolores Serrano, Carlos Zaldo, Mauricio Rico, Xavier Mateos, Junhai Liu, Uwe Griebner, Valentin Petrov, Francisco José Valle, Miguel Galán, and Gregorio Viera  »View Author Affiliations


JOSA B, Vol. 23, Issue 12, pp. 2494-2502 (2006)
http://dx.doi.org/10.1364/JOSAB.23.002494


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Abstract

Output powers as high as 300 mW were obtained at 1925 nm in the cw regime with a Tm laser operating at room temperature, either with Ti-sapphire or diode laser pumping, using a new single crystal of NaGd ( WO 4 ) 2 grown by the Czochralski method and doped with 5 mol . % of Tm 3 + in the melt. This crystal belongs to the I 4 ¯ tetragonal space group and exhibits a locally disordered structure due to the random occupancy of the same lattice sites by Na and Gd (or Tm) ions. The local disorder results in large bandwidths of the Tm 3 + optical transitions (e.g., FWHM 60 cm 1 at 5 K for the H 6 3 F 4 3 transition involved in the laser emission), which allows one to obtain one of the broadest laser tunability ranges, from 1813 to 2025 nm ( 17 THz ) , achieved with a Tm 3 + -doped crystalline material. A detailed characterization of the Tm 3 + optical spectroscopy in this novel host was performed at 5 and 300 K .

© 2006 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3380) Lasers and laser optics : Laser materials
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3600) Lasers and laser optics : Lasers, tunable
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: March 29, 2006
Manuscript Accepted: July 3, 2006

Citation
José M. Cano-Torres, María Dolores Serrano, Carlos Zaldo, Mauricio Rico, Xavier Mateos, Junhai Liu, Uwe Griebner, Valentin Petrov, Francisco José Valle, Miguel Galán, and Gregorio Viera, "Broadly tunable laser operation near 2μm in a locally disordered crystal of Tm3+-doped NaGd(WO4)2," J. Opt. Soc. Am. B 23, 2494-2502 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-12-2494


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