High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

Yung-Fu Chen; C. C. Chang; C. Y. Lee; C. L. Sung; J. C. Tung; Kuan-Wei Su; H. C. Liang; W. D. Chen; G. Zhang

doi:10.1364/PRJ.5.000561

High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

Yung-Fu Chen^*, C. C. Chang, C. Y. Lee, C. L. Sung, J. C. Tung, Kuan-Wei Su, H. C. Liang, W. D. Chen, G. Zhang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO ₄ ∕Cr ⁴⁺ : YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG _0,m or HG _m,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG _0,m or HG _m,0 eigenmodes with m > 14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams.

Original language	English
Article number	2327-9125/17/060561-06
Pages (from-to)	561-566
Number of pages	6
Journal	Photonics Research
Volume	5
Issue number	6
DOIs	https://doi.org/10.1364/PRJ.5.000561
State	Published - 1 Dec 2017

Keywords

HERMITE-GAUSSIAN MODES
OPTICAL VORTEX
LASERS

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title = "High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation",

abstract = " The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO 4 ∕Cr 4+ : YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG 0,m or HG m,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG 0,m or HG m,0 eigenmodes with m > 14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams. ",

keywords = "HERMITE-GAUSSIAN MODES, OPTICAL VORTEX, LASERS",

author = "Yung-Fu Chen and Chang, {C. C.} and Lee, {C. Y.} and Sung, {C. L.} and Tung, {J. C.} and Kuan-Wei Su and Liang, {H. C.} and Chen, {W. D.} and G. Zhang",

year = "2017",

month = dec,

day = "1",

doi = "10.1364/PRJ.5.000561",

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journal = "Photonics Research",

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T1 - High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

AU - Chen, Yung-Fu

AU - Chang, C. C.

AU - Lee, C. Y.

AU - Sung, C. L.

AU - Tung, J. C.

AU - Su, Kuan-Wei

AU - Liang, H. C.

AU - Chen, W. D.

AU - Zhang, G.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO 4 ∕Cr 4+ : YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG 0,m or HG m,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG 0,m or HG m,0 eigenmodes with m > 14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams.

AB - The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO 4 ∕Cr 4+ : YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG 0,m or HG m,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG 0,m or HG m,0 eigenmodes with m > 14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams.

KW - HERMITE-GAUSSIAN MODES

KW - OPTICAL VORTEX

KW - LASERS

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JF - Photonics Research

IS - 6

M1 - 2327-9125/17/060561-06

ER -

High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

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Keywords

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