We developed a core pumped, 3-color pulsed fiber laser with 40W average output at 1550 nm with a pulse duration of 5 ns at pulse-repetition frequency (PRF) of 1 MHz corresponding to 8kW peak power. The enabling technology for this high power laser was 1480 nm core pumping of a polarization maintaining, very large mode area (PM-VLMA) Er-doped fiber amplifier with ~37 μm mode field diameter. Optical pulses from modulated seed sources were pre-amplified to 1W average power and injected into the PM-VLMA core pumped with a 100W, 1480 nm Raman fiber laser. The VLMA amplifier showed no sign of non-linearity due to Stimulated Brillion Scattering or Four-wave mixing.
Joseph H. Zarrabi, Anand Hariharan, A. DeSantolo, and J. W. Nicholson, "High energy 1.5 µm 3-color pulsed fiber laser with high coherence length and precise wavelength control for LIDAR applications," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100831K (Presented at SPIE LASE: February 02, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2252564.
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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