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

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

中国物理B ›› 2015, Vol. 24 ›› Issue (2): 24216-024216.doi: 10.1088/1674-1056/24/2/024216

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

收稿日期:2014-06-24 修回日期:2014-09-29 出版日期:2015-02-05 发布日期:2015-02-05

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

Received:2014-06-24 Revised:2014-09-29 Online:2015-02-05 Published:2015-02-05
Contact: Saeed Ghavami Sabouri, Alireza Khorsandi E-mail:ghavami@sci.ui.ac.ir;a.khorsandi@phys.ui.ac.ir

摘要/Abstract

摘要： 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.

关键词: Bessel-Gaussian beam, walk-off, third-harmonic generation

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.

Key words: Bessel-Gaussian beam, walk-off, third-harmonic generation

中图分类号: (Nonlinear optics)

42.65.-k

42.25.Lc (Birefringence) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

Masoume Mansouri, Mohsen Askarbioki, Saeed Ghavami Sabouri, Alireza Khorsandi. Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction[J]. 中国物理B, 2015, 24(2): 24216-024216.

Masoume Mansouri, Mohsen Askarbioki, Saeed Ghavami Sabouri, Alireza Khorsandi. Walk-off reduction, using an external optical plate and Bessel—Gaussian interaction[J]. Chin. Phys. B, 2015, 24(2): 24216-024216.

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

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

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