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We present a nanosecond optical parametric oscillator for terahertz generation in periodically poled lithium niobate. The used QPM-scheme based on periodic poling leads to a collinear pump and signal wave and an emission of the terahertz wave under the well known Cherenkov-angle.
A nanosecond OPO pumped by a single mode Q-switched Nd:YVO4 laser for terahertz generation in slant stripe periodically poled lithium niobate is presented. The oscillation threshold is overcome by stabilized pump enhancement and lowered by means of injection seeding by a grating stabilized, tunable diode laser.
We report on an actively controlled enhancement cavity for terahertz generation using optical rectification in lithium niobate. By recycling the transmitted fundamental laser power from a Ti:Sapphire laser an increased pump power is available for the nonlinear process. Therefore a much higher THz signal is obtained in relation to single-pass geometry. Terahertz intensities generated by different emitters...
We report on the efficient Cherenkov-type terahertz (THz) generation using lithium niobate crystals and a high repetition rate femtosecond laser. An actively length controlled synchronously pumped ring resonator acts as an enhancement cavity for the near infrared pump and therefore recycles the available pump power towards a higher terahertz output. A seven times higher THz field amplitude was measured...
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