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Increase of the saturation power may be approached by means of the parameter adjustment even in a uniform wiggler configuration, which is comparable to the enhancement by using a tapered wiggler. Instead of the beam-wave interaction being lengthened by the use of a wiggler taper, a substantial saturation length may be shortened by virtue of the parameter adjustment.
A high-energy, low threshold THz-wave output has been experimentally demonstrated with intracavity terahertz-wave parametric oscillator based on surface-emitted configuration. The maximum THz-wave output energy of 283nJ/pulse was obtained at 1.54THz under the pump threshold of 12.9mJ/pulse in the cavity. The continuously tunable range from 0.75 to 2.75 THz was realized.
We demonstrate spectrally single-mode, low-divergence surface-emission from photonic-crystal quantum cascade lasers operating in the mid-infrared spectral range (lambda~7.2 mum). The photonic-crystal resonator is defined by the sole top metallization. No semiconductor etch is employed. The effective index contrast is induced by the different profiles of surface plasmon and air-confined modes. Numerical...
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