Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction

doi:10.1088/1674-1056/24/2/024216

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.

Keywords: Bessel-Gaussian beam walk-off third-harmonic generation

Received: 24 June 2014
Revised: 29 September 2014
Accepted manuscript online:

PACS:	42.65.-k	(Nonlinear optics)
	42.25.Lc	(Birefringence)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)

Corresponding Authors: Saeed Ghavami Sabouri, Alireza Khorsandi
E-mail: ghavami@sci.ui.ac.ir;a.khorsandi@phys.ui.ac.ir

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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Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction

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