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...

This method relies on the possibility of FourierSynthesis of discrete lines over a broad spectrum (similar to mode-locking). A Raman medium is characterized by its Raman frequency ω0, which can be the difference between two rotational or vibrational lines. When we apply a laser excitation ωL − ωs close to ω0, we can obtain gain at the stokes (ωL−nω0) and anti-stokes (ωL+nω0) frequencies, the Ra...

We experimentally investigate intermodal nonlinear interactions, such as Raman scattering and four wave mixing. The fiber used is a specially designed few moded fiber, which splits the degeneracy of the first mode group, leading to stable propagation of the two full vectorial modes, TM01 and TE01. For the Raman experiments pumping occur in either the fundamental mode or the two full vectorial m...

We propose a new approach to broadband Stimulated Raman Scattering (SRS) spectroscopy and microscopy based on time-domain Fourier transform (FT) detection of the stimulated Raman gain (SRG) spectrum. We generate two phase-locked replicas of the Stokes pulse after the sample using a passive birefringent interferometer and measure by the FT technique both the Stokes and the SRG spectra. Our appro...

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A high-power single-frequency 1178 nm continuous-wave laser is generated in a two-stage stimulated-Brillouin-scattering-suppressed all-polarization-maintaining Raman fiber amplifier pumped by 1120 nm fiber lasers. A polarization-extinction-ratio of 30 dB is achieved due to the all-polarization-maintaining configuration and the polarization dependence gain of Raman scattering. Single-pass freque...

We discuss the importance of distributed amplification for high-speed soliton communication systems through numerical simulations by considering the distributed gain provided by stimulated Raman scattering or erbium dopants. Hybrid amplification schemes are also considered. At a bit rate of 40 Gb/s, the use of distributed amplification is found to improve the transmission distance (deduced from...

A scheme of generating controllable 2+1 photons in a doubleatomic system based on active Raman gain is presented in this paper. Such 2+1 photons can be a potential candidate to generate a correlated photon pair as one photon of “2” photons acts as a trigger. Our proposal is an alternative approach to generate photon pairs where the frequencies are tunable for subsequent atomic system experiment...