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Phase matching limitations of high efficiency second harmonic generation

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2 Author(s)
Eckardt, R. ; Stanford University, Stanford, CA, USA ; Reintjes, J.

-A discussion of second harmonic generation with imperfect phase matching in the high conversion limit is presented. Phase modulation of the fundamental pulse, dispersion, central frequency wavevector mismatch, and fundamental depletion are included. The results show that even small amounts of phase modulation or central frequency wavevector mismatch can limit harmonic generation and must be considered at high conversion efficiency. Both spatial and temporal phase matching parameters are more restrictive at high conversion efficiency because of the narrowing of the central phase matching peak. If the harmonic conversion process is overdriven, severe distortion of the harmonic and transmitted fundamental pulses can result. Cascade harmonic generation of neodymium laser radiation to 266 nm is presented as an example.

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Quantum Electronics, IEEE Journal of  (Volume:20 ,  Issue: 10 )