Journal
OPTICS LETTERS
Volume 42, Issue 18, Pages 3537-3540Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.003537
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Funding
- Beijing Youth Top-notch Talent Support Program [2015000026833ZK08]
- Natural Science Foundation of Beijing Municipality [4152037]
- esearch Grant Council of the Hong Kong SAR China [PolyU152173/17E]
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In this Letter, we demonstrate experimentally for the first time, to the best of our knowledge, discrete ultraviolet (UV) wavelength generation by cascaded intermodal FWM when femtosecond pump pulses at 800 nm are launched into the deeply normal dispersion region of the fundamental guided mode of a multimode photonic crystal fiber (MPCF). For pump pulses at average input powers of P-av = 450, 550, and 650 mW, the first anti-Stokes waves are generated at the visible wavelength of 538.1 nm through intermodal phase matching between the fundamental and second-order guided mode of the MPCF. The first anti-Stokes waves generated then serve as the secondary pump for the next intermodal FWM process. The second anti-Stokes waves in the form of the third-order guided mode are generated at the UV wavelength of 375.8 nm. The maximum output power is above 10 mW for P-av = 650 mW. We also confirm that the influences of fiber bending and intermodal walk-offs on the cascaded intermodal FWM-based frequency conversion process are negligible. (C) 2017 Optical Society of America
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