The generation of wavelengths above 3 μm by nonlinear processes in short silica photonic crystal fibers is investigated numerically. It was found that wavelengths in the 3–3.5 μm range may be generated quite efficiently in centimeter-long fiber pieces when pumping with femtosecond pulses in the 1.55–2 μm range. Wavelengths in the range of 3.5–4 μm can in principle be generated, but these require shorter fiber lengths for efficient extraction. The results indicate that useful 3 μm sources may be fabricated with existing silica-based fiber technology.
Optics Letters, 2013, Vol 38, Issue 21, p. 4518-4521
Fiber optics, infrared; Nonlinear optics, fibers; Photonic crystal fibers; Ultrafast processes in fibers; Pulse propagation and temporal solitons; Femtosecond phenomena