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We demonstrate record 1.1-MW peak power ultrashort pulse source (80 nJ, 74 fs) directly out of fibers at the biologically significant ∼1300-nm spectral window using a new process of intermodal frequency conversion between ultrafast pulses.
We demonstrate, for the first time, the use of a broadband (13.8nm) chirped long period fiber grating as an ultra-low loss (<0.1dB) transmissive dispersion device, of potential utility in ultrashort-pulse fiber laser cavity design.
We convert higher order fiber modes into Gaussian beams using binary phase plates, and characterize the resulting M2 and coupling efficiency to single-mode fiber (∼64%). Reciprocally, the system is used to excite modes in multi-mode fiber with purity >13dB.
We demonstrate higher-order-mode (Aeff∼1800μm2) propagation in a 100-μm-OD pure-silica fiber with a low-index polymer jacket commonly used for fiber-laser pump-guidance. This simple structure obviates the need for complex designs deemed necessary for realizing large-mode-area fibers.
We experimentally investigate intermodal Raman interaction. The pump is in the fundamental mode, HE11, and the signal is in either of two full vectorial modes, TM01 or TE01. The on-off gain is approximately 3 dB for both modes, using 4 km of few-moded fiber and 400 mW of pump power.
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