Opt Lett. 2015 Sep 15;40(18):4218-21. doi: 10.1364/OL.40.004218.
Optics letters
Mohammed F Saleh, Fabio Biancalana
PMID: 26371900 DOI: 10.1364/OL.40.004218
Based on the interplay between photoionization and Raman effects in gas-filled photonic crystal fibers, we propose a new optical device to control frequency conversion of ultrashort pulses. By tuning the input-pulse energy, the output spectrum can be either down-converted, up-converted, or even frequency-shift compensated. For low input energies, the Raman effect is dominant and leads to a redshift that increases linearly during propagation. For larger pulse energies, photoionization starts to take over the frequency-conversion process and induces a strong blueshift. The fiber-output pressure can be used as an additional degree of freedom to control the spectrum shift.
