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9 March 2020 Frequency conversion of ultrafast, higher order vector vortex beams (Conference Presentation)
Ravi K. Saripalli, Anirban Ghosh, Apurv C. Nellikka, Goutam K. Samanta
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Proceedings Volume 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX; 112640Q (2020) https://doi.org/10.1117/12.2549942
Event: SPIE LASE, 2020, San Francisco, California, United States
Abstract
Nonlinear frequency conversion processes depend on the polarization state of interacting beams. On the other hand, vector-vortex beams have space-variant polarization in beam transverse plane. In light of these two points, it is challenging to do nonlinear frequency conversion of vector vortex beam in single-pass geometry and retain the polarization characteristics of the beam. Here, we report an experimental scheme for single-pass second harmonic generation (SHG) of vector-vortex beams. Using two contiguous bismuth borate crystals with optic axis orthogonal to each other, we have frequency-doubled the near-IR vector-vortex beam into visible vector-vortex beams with order as high as lsh=24.
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Ravi K. Saripalli, Anirban Ghosh, Apurv C. Nellikka, and Goutam K. Samanta "Frequency conversion of ultrafast, higher order vector vortex beams (Conference Presentation)", Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 112640Q (9 March 2020); https://doi.org/10.1117/12.2549942
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KEYWORDS
Ultrafast phenomena
Frequency conversion
Polarization
Second-harmonic generation
Crystal optics
Harmonic generation
Laser damage threshold
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