Topic
Brillouin scattering
About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.
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TL;DR: The enhanced opto-acoustic coupling allows significant isolation within a chip-scale (cm-long) device and the bandwidth of this device can be dramatically increased by tuning the dispersion of the waveguide to match the group velocity between optical modes.
Abstract: We propose a scheme for on-chip isolation in chalcogenide (As2S3) rib waveguides, in which Stimulated Brillouin Scattering is used to induce non-reciprocal mode conversion within a multi-moded waveguide. The design exploits the idea that a chalcogenide rib buried in a silica matrix acts as waveguide for both light and sound, and can also be designed to be multi-moded for both optical and acoustic waves. The enhanced opto-acoustic coupling allows significant isolation (> 20 dB) within a chip-scale (cm-long) device (< 10 cm). We also show that the bandwidth of this device can be dramatically increased by tuning the dispersion of the waveguide to match the group velocity between optical modes: we find that 20 dB isolation can be extended over a bandwidth of 25 nm.
143 citations
TL;DR: In this paper, anharmonic oscillator model, using the normalized photon energy, gives an excellent fit to the data over three orders of magnitude, and measured third order nonlinearities increase with the value of x, and are up to about 1000 times larger than silica for As 2 Se 3 glass.
Abstract: High purity chalcogenide glasses were prepared in the series As 2 S (3− x ) Se x where x = 0 to 3. The measured third order non-linearities increase with the value of x , and are up to about 1000 times larger than silica for As 2 Se 3 glass. We show that the anharmonic oscillator model, using the normalized photon energy, gives an excellent fit to the data over three orders of magnitude. Single mode optical fibers based on As 2 S 3 and As 2 Se 3 glasses have been fabricated using the double crucible technique and the Stimulated Brillouin Scattering (SBS) investigated. The threshold intensity for the SBS process was measured and used to estimate the Brillouin gain coefficient. Preliminary results indicate record high values for the figure of merit and theoretical gain, compared to silica, which bodes well for slow-light based applications in chalcogenide fibers.
143 citations
TL;DR: A semiclassical theory is proposed that agrees well with experimental results and is presented as a comparison with stimulated-Raman-scattering pulse compression.
Abstract: A 20-nsec Nd:YAG laser pulse is compressed to a 2-nsec phase-conjugated pulse in a tapered glass tube filled with methane at 130 atm. A comparison with stimulated-Raman-scattering pulse compression is made. A semiclassical theory is proposed that agrees well with experimental results.
142 citations
TL;DR: In this article, a pre-activated acoustic field and an optical phase control over the interrogating pulse were used for high spatial and spectral resolution Brillouin sensing with enhanced signal to noise ratio.
Abstract: High spatial ( cm) and spectral ( MHz) resolution Brillouin sensing is realized with enhanced signal to noise ratio using a pre-activated acoustic field and an optical phase control over the interrogating pulse. Pre-activation of the acoustic field preserves the Brillouin natural linewidth and a differential gain technique extends the method to long ranges. Experimentally, fully resolved measurements of the Brillouin frequency shift of a 5 cm spot perturbation at the far end of a 5 km fiber have been performed with a frequency resolution of 3 MHz (2) , using a 500 ps (5 cm) phase shift pulse.
141 citations
TL;DR: A high-resolution high-extinction parallel spectrometer for Brillouin spectroscopy of turbid samples with a high extinction ratio of up to 80 dB with sub-GHz resolution is demonstrated.
Abstract: We demonstrate a high-resolution high-extinction parallel spectrometer for Brillouin spectroscopy of turbid samples. Cascading multiple VIPA etalons in the cross-axis configuration allowed us to achieve a high extinction ratio of up to 80 dB with sub-GHz resolution. Using a three-stage VIPA, we obtained the Brillouin spectra from Intralipid solutions at concentrations up to 10%.
141 citations