【摘 要】
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Fiber-based mid-infrared (MIR) supercontinuum (SC) sources benefit from their spectral brightness and spatial coherence that are needed for many applications,su
【机 构】
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College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 4
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Fiber-based mid-infrared (MIR) supercontinuum (SC) sources benefit from their spectral brightness and spatial coherence that are needed for many applications,such as spectroscopy and metrology.In this paper,an SC spanning from 2 μm to 6 μm is demonstrated in cascaded ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) and As2Se3 step-index fibers.The pump source is a ZBLAN fiber-based MIR SC laser with abundant high-peak-power soliton pulses between 3000 nm and 4200 nm.By concatenating the ZBLAN fiber and the As2Se3 fiber,efficient cascading red-shifts are obtained in the normal dispersion region of the As2Se3 fiber.The spectral behavior of cascaded SC generation shows that the long-wavelength proportion of MIR SC generated in the ZBLAN fiber plays a critical role for further spectral extension in the As2Se3 fiber.
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