ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction |
Masoume Mansouri, Mohsen Askarbioki, Saeed Ghavami Sabouri, Alireza Khorsandi |
Department of Physics, University of Isfahan, Hezar Jarib Street, Isfahan, 81746-73441, I. R. Iran |
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Abstract To reduce the walk-off angle of the extraordinary third-harmonic ultraviolet wave at 355 nm generated by type Ⅱ KTiOPO4 and type I β-BaB2O4 optical crystals, and the Gaussian output beam of a Q-switched Nd:YAG laser, a simple theoretical model was developed based on a rotatable BK7 plate of variable thickness. By rotating the plate up to 35° along the beam direction, we reduced the walk-off angle up to ~ 13%. The same phenomenon is predicted by the model, confirming the performance of the model. It is found that, due to the walk-off effect, the intensity profile of the third-harmonic generation beam is slightly degraded. To compensate for the observed phenomena and further reduce the walk-off, we used a combination of a convex lens and an axicon to transform the beam profile of the interacting fundamental and second-harmonic generation waves to the zero-order Bessel-Gaussian form. As a result, the walk-off is decreased to ~ 48.81 mrad, providing ~ 30% relative reduction. By using the same BK7 plate rotated up to 35° along the third-harmonic beam direction, the walk-off angle is further reduced to 38.9 mrad. Moreover, it is observed that the beam profile of the emerged Bessel-Gaussian third-harmonic generation beam remains unchanged with no degradation.
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Received: 24 June 2014
Revised: 29 September 2014
Accepted manuscript online:
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PACS:
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42.65.-k
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(Nonlinear optics)
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42.25.Lc
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(Birefringence)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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Corresponding Authors:
Saeed Ghavami Sabouri, Alireza Khorsandi
E-mail: ghavami@sci.ui.ac.ir;a.khorsandi@phys.ui.ac.ir
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Cite this article:
Masoume Mansouri, Mohsen Askarbioki, Saeed Ghavami Sabouri, Alireza Khorsandi Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction 2015 Chin. Phys. B 24 024216
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