Boqin Ma, Kyle Kafka, Enam Chowdhury. Fourth-harmonic generation via nonlinear diffraction in a 2D LiNbO3 nonlinear photonic crystal from mid-IR ultrashort pulses[J]. Chinese Optics Letters, 2017, 15(5): 051901
- Chinese Optics Letters
- Vol. 15, Issue 5, 051901 (2017)
Fig. 1. Diffraction pattern of LN NPC with Sierpinski fractal superlattices.
Fig. 2. Illustration of the experimental setup.
Fig. 3. Second, third, and fourth harmonics by nonlinear diffractions in an LN NPC at a fundamental wavelength of 1997 nm. (a) Photos of centric red harmonic and its linear diffraction, and multiple harmonics. (b) Illustration of the multiple harmonics.
Fig. 4. Phase-matching diagram in nonlinear Čerenkov radiation. (a) Čerenkov second-harmonic o e
Fig. 5. Čerenkov radiation conical angle as a function of the input fundamental wavelength. The gray, red, and green lines correspond to Čerenkov second, third, and fourth harmonics. The solid and dotted lines correspond to generated o e
Fig. 6. Phase-matching diagram in cascaded FHG process (No. 4).
Fig. 7. Phase matching diagram in two kinds of cascaded FHG processes (No. 5).
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Table 1. Experimental Parameters of the Different Harmonics
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