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High power narrow-band fiber-based ASE source

: Schmidt, O.; Rekas, M.; Wirth, C.; Rothhardt, J.; Rhein, S.; Kliner, A.; Strecker, M.; Schreiber, T.; Limpert, J.; Eberhardt, R.; Tünnermann, A.

Postprint (921 KByte; PDF; )

Optics Express 19 (2011), No.5, pp.4421-4427
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

In this paper we describe a high power narrow-band amplified spontaneous emission (ASE) light source at 1030 nm center wavelength generated in an Yb-doped fiber-based experimental setup. By cutting a small region out of a broadband ASE spectrum using two fiber Bragg gratings a strongly constrained bandwidth of 12 ± 2 pm (3.5 ± 0.6 GHz) is formed. A two-stage high power fiber amplifier system is used to boost the output power up to 697 W with a measured beam quality of M2<=1.34. In an additional experiment we demonstrate a stimulated Brillouin scattering (SBS) suppression of at least 17 dB (theoretically predicted ~20 dB), which is only limited by the dynamic range of the measurement and not by the onset of SBS when using the described light source. The presented narrow-band ASE source could be of great interest for brightness scaling applications by beam combination, where SBS is known as a limiting factor.