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Frequency doubling of high-energy Nd-doped laser emission yields harmonically converted laser energy (532-nm) of 1.2-J with 60 % conversion efficiency using a high optical quality top-seeded solution growth CsB3O5 crystal.
The bandwidth of quantum-dash lasers under optical injection modulation is sharply enhanced when the injection photons are ~33 meV more energetic than the laser emission. This new bandwidth-enhancement mechanism is attributable to stimulated Raman scattering.
The maximum operating temperature of previously reported terahertz quantum-cascade lasers (QCLs) has empirically been limited to a value of ~ ħω/kB. Here, we report a new design scheme for terahertz QCLs and achieve 163-K operation for a 1.8-THz QCL, which is a factor of 1.9 larger than ħω/kB.
Saturable absorption of graphene was experimentally and theoretically investigated in femtosecond time regime with the z-scan technique. The initial ultrafast carrier relaxation time was determined to be ∼8(±3) fs. Such ultrafast dynamics is far beyond the time resolution of other ultrafast techniques with typical hundred fs laser pulses. Our results strongly suggest that graphene is an excellent...
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