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Dual-wavelength diode-pumped laser operation of N p-cut and N g-cut Tm:KLu(WO4)2 crystals

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Abstract

Simultaneous continuous-wave laser oscillation at two wavelengths has been observed and studied in a diode-pumped monoclinic N p-cut Tm:KLu(WO4)2 for different transmission of the output coupler. The maximum output power reached 1.15 W with a slope efficiency of 20.4 % with respect to the absorbed power for polarization parallel to the N m optical axis. In an analogous N g-cut crystal, the dual-wavelength laser operation is accompanied by polarization switching with increasing pump power and the switching point depends on the output coupling. The thresholds are slightly higher, and the slope efficiency reached a maximum of 25.5 % for polarization parallel to N m at low pump levels, but at high pump levels, the oscillating polarization is parallel to N p, reaching maximum output power of 3.09 W. Simple modelling with rate equations taking into account reabsorption losses explains qualitatively the complex behavior observed in the continuous-wave laser experiments with this anisotropic biaxial laser crystal.

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Acknowledgments

This work was supported by the Spanish Government under projects MAT2010-11402-E, MAT2011-29255-C02-02, TEC2010-21574-C02-02, PI09/90527, DE2009-0002, and by the Generalitat de Catalunya under project 2009SGR235. It has been partially funded by the European Commission within the Seventh Framework Programme, under projects Cleanspace, FP7-SPACE-2010-1–GA-263044 and LASERLAB-EUROPE, Grant agreement No. 228334 and the German-Spanish bilateral Programme Acciones Integradas (ID 50279160). M. Segura acknowledges the Generalitat de Catalunya through the fellowship 2011FI_B2 00013 and the Spanish Ministry of Education through the student mobility program, TME2009-00420.

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Authors and Affiliations

  1. Física i Cristal·lografía de Materials i Nanomaterials (FiCMA-FiCNA-EMaS), Universitat Rovira i Virgili (URV), Campus Sescelades c/Marcel·lí Domingo, s/n, 43007, Tarragona, Spain

    Martha Segura, Xavier Mateos, Maria Cinta Pujol, Joan Josep Carvajal, Magdalena Aguiló & Francesc Díaz

  2. Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, 12489, Berlin, Germany

    Uwe Griebner & Valentin Petrov

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  1. Martha Segura
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  2. Xavier Mateos
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  3. Maria Cinta Pujol
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  4. Joan Josep Carvajal
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  5. Magdalena Aguiló
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  8. Valentin Petrov
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Correspondence to Xavier Mateos.

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Segura, M., Mateos, X., Pujol, M.C. et al. Dual-wavelength diode-pumped laser operation of N p-cut and N g-cut Tm:KLu(WO4)2 crystals. Appl. Phys. B 113, 125–131 (2013). https://doi.org/10.1007/s00340-013-5448-8

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