Abstract
Gas-filled hollow-core photonic crystal fiber provides convenient conditions for studying stimulated Raman scattering in gases [1-3 ]. In this kind of fiber, the transmitted mode propagates almost entirely in the gas ]. In this kind of fiber, the transmitted mode propagates almost entirely in the gas-filled core. High light intensities are maintained along the fiber, leading to a much longer effective interaction length s compared to free space systems. As a result , strong nonlinear effects may be seen at relatively low pump pulse energy. In the present study, we use a hydrogen- filled hollow -core photonic bandgap fiber (HC- PBG) with a carefully engineered guidance band extending from 990 to 12 , with a Raman shift of 18 30 nm. For the rotational Raman transition S0(1) THz, and a pump laser line at 1064 nm, just two Stokes lines (1134 nm and 1215 nm) and one anti-Stokes line (1002 nm) are situated inside this band . Whereas signals at these wavelengths are guided in the fiber core and experience transmission losses below 0.8 dB/m, higher order Raman lines do not lie within the transmission band and are strongly suppressed.
© 2011 Optical Society of America
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