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Optical rectification of ultrashort laser pulses in electro-optic crystals is an established technique of terahertz generation. In this technique, the pump optical pulse produces a nonlinear polarization that moves with the group velocity of the optical pulse and acts as a source of terahertz radiation. The up-to-date generation schemes based on this principle utilize both the standard collinear phase...
In the low-frequency THz range optical rectification (OR) in LiNbOs (LN) has been providing the highest THz pulse energies, but limitations became apparent [I]. The potential of semiconductor nonlinear optical materials for high-energy high-field THz pulse generation by OR has been recently demonstrated [2-4]. Whereas pumping OR in ZnTe at 0.8 μm, near its collinear phase-matching wavelength, resulted...
Knowing the value of nonlinear index of refraction is crucial for understanding how phase modulation affects intense ultra-short pulses propagating through a given material. Measurement of Kerr constant forces building of stand-alone and often complicated setups. Most popular one — Z-scan — requires excellent beam quality, perfect beam alignment and entails separate two-photon absorption measurements...
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