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We have observed broadband quasi-phase-matched backward difference-frequency generation in short-period periodically-poled KTP, which can be used as a novel scheme for spectral phase conjugation.
We have demonstrated that frequency upconversion in periodically-poled LiNbO3 is capable of reaching single-photon sensitivities for detections at 1.27 μm and 1.57 μm at room temperature.
By stacking two GaP plates, we have improved the THz peak power from 433 W to 1.36 kW based on difference-frequency generation, corresponding to an enhancement by two orders of magnitude over the previous result.
Frequency mixing in nonlinear crystals corresponds to one of the efficient schemes for generating coherent THz pulses from intense laser beams. Recently, difference-frequency-generation (DFG) using coherent pulses at 1 mum was investigated in a few nonlinear materials; the highest peak power generated so far is 390 W. However, the average output power was still limited to 20 muW. In order to further...
Coherent THz pulses at 328.2 mum were generated by mixing two CO2 laser frequencies based on collinear phase-matched difference-frequency generation in GaSe crystals. The highest average output power was measured to be 260 muW.
Upconversion of laser beam at 10.26 mum to 1.187 mum was achieved in a GaSe crystal via difference-frequency generation with the highest conversion efficiency measured to be 19%. Saturation due to pump depletion was evidenced.
Second harmonic optical coherence tomography, which uses coherence gating of second-order nonlinear optical response of biological tissues for imaging, is described and demonstrated.
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