Observation of Parametric Amplification in the Optical Range

Gretchen K. Campbell, Jongchul Mun, Micah Boyd +3 more

We have observed parametric generation and amplification of ultracold atom pairs. A $^{87}\mathrm{Rb}$ Bose-Einstein condensate was loaded into a one-dimensional optical lattice with quasimomentum ${k}_{0}$ and spontaneously scattered into two final states with quasimomenta ${k}_{1}$ and ${k}_{2}$. Furthermore, when a seed of atoms was first created with quasimomentum ${k}_{1}$ we observed parametric amplification of scattered atoms pairs in states ${k}_{1}$ and ${k}_{2}$ when the phase-matching condition was fulfilled. This process is analogous to optical parametric generation and amplification of photons and could be used to efficiently create entangled pairs of atoms. Furthermore, these results explain the dynamic instability of condensates in moving lattices observed in recent experiments.

M. M. Sushchik, V. M. Fortus, Gennadii I Freidman

Masaki Asobe, Daiki Yagi, Yuki Kawabata +4 more

Optical parametric amplification in the range of 1.3–1.8 µm was demonstrated by using a periodically poled LiNbO3 (PPLN) waveguide as a nonlinear medium by varying the detuning of the pump wavelength. A wide range of detuning was enabled by using a multiple-quasi-phase-matched (M-QPM) LiNbO3 waveguide for pump generation through second harmonic generation (SHG) and temperature control of the PPLN waveguide. Broadband optical amplification and wavelength conversion through difference frequency generation (DFG) are considered useful for widening the bandwidth of optical communication.

Juan Ariel Levenson, Izo I. Abram, Kamel Bencheikh +1 more

Viktorija Tamulienė, Paulius Stanislovaitis

Optical parametric amplification of signal and idler waves in the field of the incoherent pump is investigated. The improvement of the coherence of the amplified waves in the trapping regime is demonstrated. Numerical simulations for the experimental situation in the BBO crystal are provided. It is elucidated that the wide range of wavelengths of the interacting waves can be used.

Mahmood Hosseini Farzad