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Orthogonally polarized dual-wavelength Yb:KGW laser induced by thermal lensing

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Abstract

Simultaneous dual-wavelength laser oscillation with orthogonal polarizations has been observed and analyzed in a continuous wave N g-cut Yb:KGW oscillator. Without inserting any optical elements for polarization control, the N m- and N p-polarized modes, each of which possessed a distinct wavelength, coexisted and switched twice in two power regimes as the pump power was varied. The two wavelengths and their separation slightly depended on output coupling level. The wavelength switching and coexistence was studied and explained by considering the thermal and spectral anisotropy of the Yb:KGW crystals, which led to polarization-dependent reabsorption loss in the unpumped regions of the crystal. The maximum average output power obtained in the dual-wavelength regime was 4.6 W.

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Acknowledgments

This work was supported by the Natural Sciences and Engineering Research Council of Canada, University of Manitoba, and Western Economic Diversification Canada.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Manitoba, 75A Chancellors Circle, Winnipeg, MB, R3T 5V6, Canada

    Haitao Zhao & Arkady Major

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  1. Haitao Zhao
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  2. Arkady Major
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Correspondence to Arkady Major.

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Zhao, H., Major, A. Orthogonally polarized dual-wavelength Yb:KGW laser induced by thermal lensing. Appl. Phys. B 122, 163 (2016). https://doi.org/10.1007/s00340-016-6441-9

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  • DOI: https://doi.org/10.1007/s00340-016-6441-9

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