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

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

doi:10.1117/12.2252259

20 February 2017 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

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

Author Affiliations +

Proceedings Volume 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI; 100880E (2017) https://doi.org/10.1117/12.2252259
Event: SPIE LASE, 2017, San Francisco, California, United States

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.

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Tobias Baselt, Christopher Taudt, Bryan Nelsen, Andrés Fabián Lasagni, and Peter Hartmann "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", Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 100880E (20 February 2017); https://doi.org/10.1117/12.2252259

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