Generation of a mode-tunable optical vortex based on a mirror curvature dynamically controlled Z-shaped resonant cavity

Deen Wang; Deen Wang; Deen Wang; Ming Lei; Shibing Lin; Shibing Lin; Yamin Zheng; Yamin Zheng; Shaonan Kang; Shaonan Kang; Lei Huang; Lei Huang

doi:10.1364/OL.422316

Optics Letters
Vol. 46,
Issue 13,
pp. 3079-3082
(2021)
•https://doi.org/10.1364/OL.422316

Generation of a mode-tunable optical vortex based on a mirror curvature dynamically controlled Z-shaped resonant cavity

Deen Wang, Ming Lei, Shibing Lin, Yamin Zheng, Shaonan Kang, and Lei Huang

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Deen Wang, Ming Lei, Shibing Lin, Yamin Zheng, Shaonan Kang, and Lei Huang, "Generation of a mode-tunable optical vortex based on a mirror curvature dynamically controlled Z-shaped resonant cavity," Opt. Lett. 46, 3079-3082 (2021)

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Abstract

We report a novel, to the best of our knowledge, mode-tunable optical vortex generation method based on a mirror curvature dynamically controlled Z-shaped resonant cavity, a mode conversion beamline, and a reference laser beamline. By changing the mirror curvature of an intra-cavity deformable mirror (DM) at a certain pumping voltage and current, various Hermite–Gaussian (HG) mode beams were obtained in the Z-shaped resonant cavity of a laser diode pumped Yb:CALGO laser. The vortex beams were realized finally by using an external cavity astigmatism converter. In the experiment, the dynamic tuning of the 1st to 9th order HG mode beams and Laguerre–Gaussian mode vortex beams carrying different orbital angular momenta, ranging from 1${\hbar}$ to 9${\hbar}$ were achieved by dynamically adjusting the driving voltage of the DM.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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PV (µm)	1.4	2.7	4.7	6.1	7.0	7.8	8.7	9.5	10.0
Beam mode	${H G}_{1, 0}$	${H G}_{2, 0}$	${H G}_{3, 0}$	${H G}_{4, 0}$	${H G}_{5, 0}$	${H G}_{6, 0}$	${H G}_{7, 0}$	${H G}_{8, 0}$	${H G}_{9, 0}$
Beam mode	${L G}_{1, 0}$	${L G}_{2, 0}$	${L G}_{3, 0}$	${L G}_{4, 0}$	${L G}_{5, 0}$	${L G}_{6, 0}$	${L G}_{7, 0}$	${L G}_{8, 0}$	${L G}_{9, 0}$

Beam Mode	${H G}_{1, 0}$	${H G}_{2, 0}$	${H G}_{3, 0}$	${H G}_{4, 0}$	${H G}_{5, 0}$	${H G}_{6, 0}$	${H G}_{7, 0}$	${H G}_{8, 0}$	${H G}_{9, 0}$
Pumping voltage (V)	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.5
Pumping current (A)	3.0	3.5	3.9	4.1	4.4	4.4	5.1	5.1	5.2
Driving voltage of the DM (V)	0	20	40	55	65	75	90	100	110
Threshold pumping power (W)	5.30	6.21	7.18	7.62	8.12	8.50	9.15	9.54	9.96
Maximum output power (W)	0.48	0.47	0.45	0.43	0.40	0.36	0.34	0.29	0.24

PV (µm)	1.4	2.7	4.7	6.1	7.0	7.8	8.7	9.5	10.0
Beam mode	${H G}_{1, 0}$	${H G}_{2, 0}$	${H G}_{3, 0}$	${H G}_{4, 0}$	${H G}_{5, 0}$	${H G}_{6, 0}$	${H G}_{7, 0}$	${H G}_{8, 0}$	${H G}_{9, 0}$
Beam mode	${L G}_{1, 0}$	${L G}_{2, 0}$	${L G}_{3, 0}$	${L G}_{4, 0}$	${L G}_{5, 0}$	${L G}_{6, 0}$	${L G}_{7, 0}$	${L G}_{8, 0}$	${L G}_{9, 0}$

Beam Mode	${H G}_{1, 0}$	${H G}_{2, 0}$	${H G}_{3, 0}$	${H G}_{4, 0}$	${H G}_{5, 0}$	${H G}_{6, 0}$	${H G}_{7, 0}$	${H G}_{8, 0}$	${H G}_{9, 0}$
Pumping voltage (V)	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.5
Pumping current (A)	3.0	3.5	3.9	4.1	4.4	4.4	5.1	5.1	5.2
Driving voltage of the DM (V)	0	20	40	55	65	75	90	100	110
Threshold pumping power (W)	5.30	6.21	7.18	7.62	8.12	8.50	9.15	9.54	9.96
Maximum output power (W)	0.48	0.47	0.45	0.43	0.40	0.36	0.34	0.29	0.24

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Optics Letters