F. Benabid

Electromagnetically induced transparency in acetylene molecules with counterpropagating beams in V and Λ schemes

We report on the experimental observation of electromagnetically induced transparency in V and Λ energy level schemes using counterpropagating coupling and probe beam geometry. The observation was achieved using an acetylene photonic microcell. The conditions required for this observation are explored theoretically, and we show that the use of counterpropagating beams in electromagnetically induced transparency may have applications as a spectroscopic technique where velocity discrimination is desirable.

High-efficiency cross-phase modulation in a gas-filled waveguide

Strong cross-Kerr nonlinearities have been long sought after for quantum information applications. Recent work has shown that they are intrinsically unreliable in traveling-wave configurations: cavity configurations avoid this, but require knowledge of both the nonlinearity and the loss. Here we present a detailed systematic study of cross-phase modulation and absorption in an Rb vapor confined within a hollow-core photonic crystal fiber. Using a two-photon transition, we observe phase modulations of up to pi rad with a signal power of 25 mu W, corresponding to a nonlinear Kerr coefficient, n(2), of 0.8 x 10(-6) cm(2)/W, or 1.3 x 10(-6) rad per photon.

Hollow-core fibre frequency standard

Summary form only given. The development of high-quality and low-loss hollow-core photonic-crystal fiber (HC-PCF) offers interesting opportunities to develop robust and compact frequency standards. We are pursuing two different types of frequency standards based on HC-PCF: one based on saturation spectroscopy of iodine, and a second based on two-photon spectroscopy of rubidium. In this presentation we will present the progress with the rubidium-loaded fibre.

Optically Pumped C2H2 and HCN Lasers with Conventional Cavities and Based on Hollow Core Photonic Crystal Fibers

Lasing in C2H2 and HCN are demonstrated in conventional gas cell/cavity geometries and with hollow core photonic crystal fibers when optically pumped in the 1.5 μm region by a ns optical parametric oscillator. Two lasing transitions in the mid‐IR region (3 μm) are observed.

10 kHz accuracy spectroscopy in acetylene-filled hollowcore kagome fiber and improved linewidths

A CW fiber laser is stabilized to the P(13) ν1+ν3 transition of 12C2H2 inside large-core kagome fiber using FM spectroscopy techniques and characterized with a frequency comb. Improved line widths are explored.