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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...
Anti-Stokes photoluminescence (ASPL) of n-type GaN is observed at room temperature. By studying behaviors of ASPL, the mechanism is identified as phonon-assisted bandtail photoluminescence. Such a process results in laser cooling.
Terahertz (THz) radiation generated by ultrafast laser pulses focused on each monoclinic semiconductor crystal, i.e., GaTe, exhibits unique features. By systemically measuring the dependence of the THz output on the ultrafast pump pulses, in terms of polarization, azimuth angle, incident angle, pump beam size, and pump intensity, we have observed the strong evidence of the unidirectional diffusion...
Based on effective third-harmonic generation in two-section dual-period periodically-poled KTP crystal being placed inside the cavity of adhesive-free bond composite Nd:YAG laser, we generated coherent blue light with output power reaching 200 mW.
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