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

28 Scopus citations

Abstract

The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO₄∕Cr⁴⁺: 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

Access to Document

10.1364/PRJ.5.000561

Cite this

@article{e390adbf39a54856bbb4acbb74284d8f,

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:YVO4∕Cr4+: YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG0,m or HGm,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 HG0,m or HGm,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",

note = "Publisher Copyright: {\textcopyright} 2017 Chinese Laser Press.",

year = "2017",

month = dec,

day = "1",

doi = "10.1364/PRJ.5.000561",

language = "English",

volume = "5",

pages = "561--566",

journal = "Photonics Research",

issn = "2327-9125",

publisher = "Optica Publishing Group (formerly OSA)",

number = "6",

}

TY - JOUR

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:YVO4∕Cr4+: YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG0,m or HGm,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 HG0,m or HGm,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:YVO4∕Cr4+: YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG0,m or HGm,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 HG0,m or HGm,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

UR - http://www.scopus.com/inward/record.url?scp=85037344268&partnerID=8YFLogxK

U2 - 10.1364/PRJ.5.000561

DO - 10.1364/PRJ.5.000561

M3 - Article

AN - SCOPUS:85037344268

SN - 2327-9125

VL - 5

SP - 561

EP - 566

JO - Photonics Research

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this