Journal
OPTICS EXPRESS
Volume 25, Issue 14, Pages 15760-15771Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.015760
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Funding
- Helmholtz Association through the Helmholtz Young Investigator Group [VH-NG-804]
- Helmholtz-CAS Joint Research Group grant [HCJRG 201]
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We demonstrate that energetic femtosecond pulses tunable from 1.3 to 1.7 mu m can be achieved using self-phase modulation enabled spectral broadening followed by spectral lobe filtering. Based on a home-built 5-W Er-fiber laser system operating at 31-MHz repetition rate, we obtain femtosecond pulses that can be continuously tuned from 1.3 to 1.7 mu m with >4.5 nJ pulse energy. We further optimize the spectral broadening process using a fiber with larger mode area and scale up the pulse energy to >10 nJ; the resulting pulse duration is as short as similar to 50 fs. Such a widely tunable, energetic femtosecond source is well suited for driving a laser scanning microscope to perform deep tissue multiphoton microscopy. (C) 2017 Optical Society of America
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