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We have shown that Raman oscillation, frequency upconversion, and Raman amplification can be achieved in a second-order nonlinear medium at the phonon-polariton resonance.
We have observed enhancements of forward and backward anti-Stokes Raman signals generated in lithium niobate waveguides by one order of magnitude. Forward and backward exhibit different spectral features, unique for two configurations.
We investigated hot phonons based on Stokes Raman scattering from a GaN/AlN high electron mobility transistor. Such a simple method is advantageous compared with the method based on Stokes and anti-Stokes Raman scattering.
Laser cooling of solids based on anti-Stokes photoluminescence was proposed in 1929 [1]. Indeed, through the light emission based on phonon-assisted anti-Stokes photoluminescence, the average photon energy emitted is larger than that for the absorbed pump photons. The difference between the emitted and absorbed photon energies is made up by the energy of each removed phonon. Since phonons represent...
We have observed enhancement factors of at least 21 for backward-propagating anti-Stokes Raman signals generated by Ti-diffused lithium niobate waveguides under the microwatt pump power and using a single-photon detector.
A peak effect of the critical current density was observed for all NdBa 2 Cu 3 O 7-δ (Nd123) samples prepared by the solid-state reaction method in atmospheres containing different oxygen concentrations. The peak position (field value) and its critical current density value measured at 30, 50, and 71K depend strongly on the sintering time, and on the oxygen concentration...
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