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Optics Letters

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  • Vol. 37, Iss. 13 — Jul. 1, 2012
  • pp: 2652–2654

Efficient graphene Q switching and mode locking of 1.34 μm neodymium lasers

Jin-Long Xu, Xian-Lei Li, Jing-Liang He, Xiao-Peng Hao, Ying Yang, Yong-Zhong Wu, Shan-De Liu, and Bai-Tao Zhang  »View Author Affiliations


Optics Letters, Vol. 37, Issue 13, pp. 2652-2654 (2012)
http://dx.doi.org/10.1364/OL.37.002652


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Abstract

We demonstrate that few-layered graphene sheets used as a saturable absorber can provide efficient Q-switching and mode-locking modulation in 1.34 μm Nd:GdVO4 bulk lasers. The minimum Q-switched pulses were 450 ns for 260 mW average power, 43 kHz repetition rate, and 2.5 μJ pulse energy. For the mode-locked laser, an average power of 1.29 W was achieved with 11 ps pulse duration and 13 nJ pulse energy. To our knowledge, this average power is the highest yet obtained from a graphene mode-locked laser, and the corresponding optical—optical efficiency of 23% is the best result among 1.3 μm neodymium mode-locked lasers. The quality factor M2 of the Q-switched beam was 1.4 and 1.6 in the horizontal and longitudinal planes, respectively, and the M2 of the mode-locked beam reached 1.1 and 1.0. These results clearly indicate the advantages of few-layered graphene as a saturable absorber.

© 2012 Optical Society of America

OCIS Codes
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.7090) Lasers and laser optics : Ultrafast lasers
(160.4330) Materials : Nonlinear optical materials

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 14, 2012
Revised Manuscript: April 29, 2012
Manuscript Accepted: April 29, 2012
Published: June 25, 2012

Citation
Jin-Long Xu, Xian-Lei Li, Jing-Liang He, Xiao-Peng Hao, Ying Yang, Yong-Zhong Wu, Shan-De Liu, and Bai-Tao Zhang, "Efficient graphene Q switching and mode locking of 1.34 μm neodymium lasers," Opt. Lett. 37, 2652-2654 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-13-2652


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