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Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser

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Abstract

A quasi-monolithic second-harmonic-generation ring resonator assembled with miniaturized components is presented. The ring contains a 10-mm-long bulk periodically poled lithium niobate crystal for second-harmonic generation, four plane mirrors and two gradient-index lenses. All parts are mounted on a glass substrate with an overall size of 19.5 mm×8.5 mm×4 mm. As pump source a broad-area laser diode operated in an external resonator with Littrow arrangement is utilized. This external cavity diode laser provides near diffraction limited, narrow-bandwidth emission with an optical output power of 450 mW at a wavelength of 976 nm. Locking of the diode laser emission to the resonance frequency of the ring cavity was achieved by an optical self-injection locking technique. With this setup more than 126 mW of diffraction-limited blue light at 488 nm could be generated. The opto–optical conversion efficiency was 28% and a wall plug efficiency better than 5.5% could be achieved.

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Authors and Affiliations

  1. Chair of Photonics, University of Potsdam, Karl-Liebknecht-Str. 24–25, 14476, Potsdam, Germany

    D. Skoczowsky, A. Jechow & R. Menzel

  2. Grintech GmbH, Schillerstraße 1, 07745, Jena, Germany

    H. Stürmer & T. Poßner

  3. Sacher Lasertechnik GmbH, Rudolf-Breitscheid-Str. 1–5, 35037, Marburg, Germany

    J. Sacher

Authors
  1. D. Skoczowsky
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  2. A. Jechow
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  3. H. Stürmer
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  4. T. Poßner
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  5. J. Sacher
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  6. R. Menzel
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Correspondence to D. Skoczowsky.

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Skoczowsky, D., Jechow, A., Stürmer, H. et al. Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser. Appl. Phys. B 98, 751–757 (2010). https://doi.org/10.1007/s00340-009-3802-7

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  • DOI: https://doi.org/10.1007/s00340-009-3802-7

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