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Acousto-optic tunable second harmonic generation in periodically poled LiNbO_3

Zi-yan Yu, Fei Xu, Fei Leng, Xiao-shi Qian, Xiang-fei Chen, Yan-qing Lu
2009 Optics Express  
Acousto-optic (AO) tunable second harmonic generation (SHG) was proposed in periodically poled lithium niobate (PPLN). The acoustic wave could either be induced from an external transducer or self-generated in PPLN driving with a cross-field radio frequency field. The reciprocal vector of PPLN compensates the SHG wave-vector mismatch when quasiphase-matching (QPM) condition is satisfied, while phonons with suitable frequencies may affect it by scattering photons to different polarization state.
more » ... polarization state. The QPM SHG and AO polarization rotation are coupled together. Second harmonic waves' intensities, polarization states and even phases thus could be manipulated instantly through AO interaction.
doi:10.1364/oe.17.011965 pmid:19582111 fatcat:wcyathnr6reoxgudef6onxlbxi