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Development of a method to overcome the power threshold during supercontinuum generation based on an Yb-doped photonic crystal fiber

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

Fulltext urn:nbn:de:0011-n-4703632 (913 KByte PDF)
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Copyright Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Created on: 29.11.2017

Optical engineering 57 (2017), No.2, Art. 021207, 6 pp.
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
Journal Article, Electronic Publication
Fraunhofer IWS ()
supercontinuum; ytterbium doped photonic crystal fiber; light source; nanosecond pulses

Optical coherence tomography benefits from the high brightness and bandwidth, as well as the spatial coherence of supercontinuum (SC) sources. The increase of spectral power density (SPD) over conventional light sources leads to shorter measuring times and higher resolutions. For some applications, only a portion of the broad spectral range can be used. Therefore, an increase of the SPD in specific limited spectral regions would provide a clear advantage over spectral filtering. This study describes a method to increase the SPD of SC sources by amplifying the excitation wavelength inside of a nonlinear photonic crystal fiber (PCF). An ytterbium-doped PCF was manufactured by a nanopowder process and used in a fiber amplifier setup as the nonlinear fiber medium. The performance of the fiber was compared with a conventional PCF that possesses comparable parameters. Finally, the system as a whole was characterized in reference to common solid-state laser-based photonic SC light sources. An order-of-magnitude improvement of the power density was observed between the wavelengths from 1100 to 1350 nm.