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We have observed resonance-enhanced Stokes and anti-Stokes Raman scattering of coherent picosecond pulses by one as well as two longitudinal-optical phonons in GaN film grown on Si (111) substrate.
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.
We have evidenced hot and cold longitudinal-optical (LO) phonons induced by electric field and resonant Raman scattering in GaN/AlN triangular quantum well, probed by first-order and second-order resonant Raman scattering of 3-ps light pulses.
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