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Second harmonic generation (SH) based on the enhancement of localized fields confined in nanoscale periodic, GaAs-filled holes in a metal film is presented. The SH saturates for a fundamental peak power intensity Gt 20 GW/cm2.
Coherent ns pulses for 2nd, 3rd, and 4th harmonics of CO2 laser frequency were efficiently generated from GaSe crystals, with corresponding output peak powers as high as 443 W, 23 W, and 2 W, respectively.
Broadband THz pulses have been generated from InGaN/GaN multiple quantum wells pumped by a frequency-doubled sub-picosecond laser amplifier at 395 nm. Enhanced THz emissions are strongly correlated with reduced photoluminescence intensities.
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