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All-fiber supercontinuum source with flat, high power spectral density in the range between 1.1 μm to 1.4 μm based on an Yb3+ doped nonlinear photonic crystal fiber

 
: Baselt, Tobias; Taudt, Christopher; Nelsen, Bryan; Lasagni, Andrés-Fabián; Hartmann, Peter

:

Vodopyanov, K.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XVI : San Francisco, California, United States, January 28, 2017
Bellingham, WA: SPIE, 2017 (SPIE Proceedings 10088)
ISBN: 978-1-5106-0617-3
ISBN: 978-1-5106-0618-0
Art. 100880E
Conference "Nonlinear Frequency Generation and Conversion - Materials, Devices, and Applications" <16, 2017, San Francisco/Calif.>
Bundesministerium für Bildung und Forschung BMBF
03FH004PX3
English
Conference Paper
Fraunhofer IWS ()
photonic crystal fibers; supercontinuum sources; Ytterbium

Abstract
Supercontinuum light sources provide a high power spectral density with a high spatial coherence. Coherent octavespanning supercontinuum can be generated in photonic crystal fibers (PCFs) by launching short pulses into the fiber. In the field of optical metrology, these light sources are very interesting. For most applications, only a small part of the entire spectrum can be utilized. In biological tissue scattering, absorption and fluorescence limits the usable spectral range. Therefore, an increase of the spectral power density in limited spectral regions would provide a clear advantage over spectral filtering. This study describes a method to increase the spectral power density of supercontinuum sources by amplifying the excitation wavelength inside a nonlinear photonic crystal fiber (PCF). An all-fiber-based setup enables higher output power and power stability. An ytterbium-doped photonic crystal fiber was manufactured by a nanopowder process (drawn by the fiberware GmbH, Germany) and used in a fiber amplifier setup as the nonlinear fiber medium. In order to characterize the fiber’s optimum operational characteristics, group-velocity dispersion (GVD) measurements were performed. The performance of the fiber-based setup was compared with a free space setup. Finally, the system as a whole was characterized in reference to common solid state-laser-based supercontinuum light sources. An improvement of the power density was observed in the spectral range between 1100 nm to 1400 nm.

: http://publica.fraunhofer.de/documents/N-452853.html