List of Division publications with links

2014-08-21 07:55 - Supercontinuum up-conversion via molecular modulation in gas-filled hollow-core PCF

S. T. Bauerschmidt, D. Novoa, B. M. Trabold, A. Abdolvand, and P. St.J. Russell, Optics Express, Vol. 22, Issue 17, pp. 20566-20573 (2014)

We report on the efficient, tunable, and selective frequency up-conversion of a supercontinuum spectrum via molecular modulation in a hydrogen-filled hollow-core photonic crystal fiber. The vibrational Q(1) Raman transition of hydrogen is excited in the fiber by a pump pre-pulse, enabling the excitation of a synchronous, collective oscillation of the molecules. This coherence wave is then used to up-shift the frequency of an arbitrarily weak, delayed probe pulse. Perfect phase-matching for this process is achieved by using higher order fiber modes and adjusting the pressure of the filling gas. Conversion efficiencies of ~50% are obtained within a tuning range of 25 THz.