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Proceedings Paper

Compact module of a frequency-doubled, CW diode laser with an output power of more than 500 mW at 531 nm and a beam quality of less than 1.3
Author(s): J. Wueppen; E. Pawlowski; M. Traub; B. Jungbluth; K.-H. Hasler; B. Sumpf; G. Erbert
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Paper Abstract

We present a compact module, emitting nearly diffraction limited green laser light at 531 nm at an average output power of more than 500 mW. As pump source for the second harmonic generation a DBR tapered laser with a total length of 6 mm was used. The RW section had a length of 2 mm including a 1 mm long passive DBR section. The devices were mounted p-side up on a copper block. For this mounting scheme, the device reaches up to 7 W maximal output power. At the power level of about 3.8 W used in the presented experiment, a wavelength of 1062.6 nm with a line-width below 0.02 nm (FWHM) was determined. More than 80% of the emitted power is originated within the central lobe of the beam waist profile illustrating the nearly diffraction limited beam quality. Using a 30mm long MgO-doped periodically poled LiNbO3 bulk crystal, the second harmonic wave is generated in a single-pass setup. Due to precise alignment and beam shaping based on the results of numerical simulations and a properly temperature control of the PPLN crystal, a maximum optical conversion efficiency of more than 14% (3.7%/W) was achieved. The fluctuation of the output power is far below 1%.

Paper Details

Date Published: 17 February 2010
PDF: 8 pages
Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 758204 (17 February 2010); doi: 10.1117/12.841778
Show Author Affiliations
J. Wueppen, Fraunhofer-Institut für Lasertechnik (Germany)
E. Pawlowski, Fraunhofer-Institut für Lasertechnik (Germany)
M. Traub, Fraunhofer-Institut für Lasertechnik (Germany)
B. Jungbluth, Fraunhofer-Institut für Lasertechnik (Germany)
K.-H. Hasler, Ferdinand-Braun-Institut für Höchstfrequenztechnik (Germany)
B. Sumpf, Ferdinand-Braun-Institut für Höchstfrequenztechnik (Germany)
G. Erbert, Ferdinand-Braun-Institut für Höchstfrequenztechnik (Germany)

Published in SPIE Proceedings Vol. 7582:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
Peter E. Powers, Editor(s)

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