Photonic crystal fiber (PCF) technology has radically impacted the scientific and industrial ultrafast laser market. Reducing platform dimensions are important to decrease cost and footprint while maintaining high optical efficiency. We present our recent work on short 85 μm core ROD-type fiber amplifiers that maintain single-mode performance and excellent beam quality. Robust long-term performance at 100 W average power and 250 kW peak power in 20 ps pulses at 1030 nm wavelength is presented, exceeding 500 h with stable performance in terms of both polarization and power. In addition, we present our recent results on hollow-core ultrafast fiber delivery maintaining high beam quality and polarization purity.
Marco Triches, Mattia Michieletto, Mette M. Johansen, Christian Jakobsen, Anders S. Olesen, Sidsel R. Papior, Torben Kristensen, Magalie Bondue, Johannes Weirich, and Thomas T. Alkeskjold, "Photonic crystal fiber technology for compact fiber-delivered high-power ultrafast fiber lasers," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120X (Presented at SPIE LASE: January 30, 2018; Published: 26 February 2018); https://doi.org/10.1117/12.2287344.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon