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Experimental setup for terahertz generation based on frequency-mixing two lasers in several GaSe crystals: and —glass and germanium attenuators, BP—Brewster polarizer (transmittance of 95% for parallel-polarized wave and reflectivity of 95% for vertically polarized wave), and —quartz and black polyethylene filters, —irises, and —plano-convex lenses with the same focal length of either 50 or depending on the crystal length, —silicon mirrors, WP—half-wave plate, and and —gold parabolic mirrors. An etalon is constructed from two parallel Ge plates; one of which is spatially translated by a step motor with a resolution of better than .
Generated terahertz output power vs crystal length. Crystals used in this experiment were 2, 4, 10, 15, and long. (a) and (b) correspond to and configurations. Each of the two straight lines corresponds to a linear fit to the data obtained on the crystals having the lengths of 2, 10, and .
Transmitted power of terahertz wave after propagating through a terahertz polarizer vs polarization angle. Dots and circles—experimental results for and configurations. Solid lines— and .
Transmitted terahertz power vs spatial translation for one of the Ge plates. Wavelength of output pulses was measured to be .
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