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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

 
: Wueppen, J.; Pawlowski, E.; Traub, M.; Jungbluth, B.; Hasler, K.-H.; Sumpf, B.; Erbert, G.

:

Powers, P.E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear frequency generation and conversion. Materials, devices and applications IX : 25 - 28 January 2010, San Francisco, California, United States; SPIE Photonics West
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7582)
ISBN: 978-0-8194-7978-5
Paper 758204
Conference "Nonlinear Frequency Generation and Conversion - Materials, Devices and Applications" <9, 2010, San Francisco/Calif.>
Photonics West Conference <2010, San Franciso/Calif.>
English
Conference Paper
Fraunhofer ILT ()

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%.

: http://publica.fraunhofer.de/documents/N-153860.html