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Free-space quasi-phase matching
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DOI：10.1364/OL.502825.png)
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Abstract
En 中文
We report a new, to the best of our knowledge, approach to phase matching of nonlinear materials based on the free-space multipass cells. This technique is applicable to noncentrosymmetric nonlinear crystals, including crystals that cannot be birefringent phase-matched or quasi-phase matched by periodic poling. Notably, by using this approach, the crystalline quartz is quasi-phase matched with the demonstrated increase of the second harmonic generation efficiency by a factor of 40. The method can be extended toward UV and THz ranges. This promises to revolutionize experimental nonlinear optics and all applications by increasing the number of available crystals for quasi-phase matching by at least one order of magnitude and brings fresh motivation for developing novel nonlinear materials.
Keywords:
OPTICAL PARAMETRIC OSCILLATOR
2ND HARMONIC-GENERATION
2ND-HARMONIC GENERATION
CONTINUOUS-WAVE
HIGH-EFFICIENCY
SINGLE-PASS
CRYSTAL
THICK
MULTICRYSTAL
QUARTZ