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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 demonstrate that surface-emitting second-harmonic generation is an effective technique for evaluating domains of periodically-poled lithium niobate waveguide: domain period, linear taper, and poling depth. Such a method reaches nanoscale spatial resolution of 0.5 nm.
We show that waveguides made of GaN/AlGaN heterostructures can be used for efficient parametric up and down conversion under transverse geometry. The conversion efficiency for generation of coherent ultraviolet radiation reaches 1%.
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.
We implemented single-photon detector in 1500-nm band based on frequency up-conversion in nonlinear waveguide at pump wavelength of 1920 nm. Ultralow dark count rate and signal photon detection rate are 20 s−1 and 56.8 s−1.
Transversely-propagating THz radiation can be up-converted to an optical wave propagating in the waveguide. Complete photon conversion and single-photon detection can be reached.
We have implemented a single-photon detector in the 1500-nm band based on frequency up-conversion in a MgO-doped periodically-poled LiNbO3 waveguide, with a record-low dark count rate and a record-low detectable signal photon rate.
We demonstrate efficient generation of far-infrared radiation at the center wavelength of 20.8 μm in lithium niobate in the vicinity of one of the polariton resonances.
In the near-IR and mid-IR regions, periodically-poled LiNbO3 (PPLN) has become an extremely efficient nonlinear medium. However, since long-wavelength cutoff for LiNbO3 is 5.5 µm, the longest wavelength ever generated from such a crystal is 6.8 µm [1]. Such a limit is caused by the strong polariton resonances due to the coupling of transverse-optical phonons with electromagnetic waves, see Fig. 1(a)...
MgO-doped periodically-poled LiNbO3 waveguide is used to up-convert photons at 1.535–1.568 μm to those at 598–603 nm, which can be detected by avalanche photodetector at single-photon counting level. Conversion efficiencies up to 45% are achieved.
By coupling two counter-propagating fundamental beams into a LiNbO3 channel waveguide, we have generated a strong surface-emitting second-harmonic beam, with normalized conversion efficiency being enhanced by seven orders of magnitude.
Transverse-pumping geometry can be utilized for efficient generation of far-infrared radiation in 13–30 μm based on difference-frequency generation in periodically-poled LiNbO3 at its polariton resonances. High conversion efficiencies are achievable.
We show that transverse-pumping geometry can be exploited for THz generation when a second-order nonlinear medium is highly lossy at its polariton resonance. High conversion efficiencies can be achieved via such a novel configuration.
Continuous-wave (CW) operation of ridge waveguide quantum well diode lasers in the green/blue has been demonstrated at voltages as low as 4.4V in ZnCdSe/ZnSSe/ZnMgSSe pseudomorphic separate confinement heterostructures, with output powers up to 10 mW.<<ETX>>
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