Tunable pulse advancement and delay by frequency-chirped stimulated Raman gain with optical nanofiber

We demonstrate a novel method to optically tune the pulse advancement and delay based on stimulated Raman gain in hydrogen. With frequency-chirped pump, generated signal is selectively amplified at leading or trailing edge of pump pulse, depending whether frequency difference between beam blue red detuned from transition, which results peak. Different slow/fast light, where are accompanied with power loss gain, respectively, for single resonance, both realized region here. piece 48-mm-long optical nanofiber hydrogen, time-shift peak ranging 3.7 ?3.7 ns achieved Raman-generated width .