Observation of wave-breaking-free square pulses in a fiber ring laser

Tonghui Liu; Dongfang Jia; Ying Liu; Zhaoying Wang; Tianxin Yang

doi:10.3788/COL201513.101401

Journals >Chinese Optics Letters >Volume 13 >Issue 10 >Page 101401 > Article

Chinese Optics Letters
Vol. 13, Issue 10, 101401 (2015)

Observation of wave-breaking-free square pulses in a fiber ring laser

Tonghui Liu¹, Dongfang Jia^1、*, Ying Liu^1、2, Zhaoying Wang¹, and Tianxin Yang¹

Author Affiliations

¹Key Laboratory of Opto-electronic Information and Technical Science, College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China

²Department of Applied Physics, Tianjin University, Tianjin 300072, China

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DOI: 10.3788/COL201513.101401 Cite this Article Set citation alerts

Tonghui Liu, Dongfang Jia, Ying Liu, Zhaoying Wang, Tianxin Yang. Observation of wave-breaking-free square pulses in a fiber ring laser[J]. Chinese Optics Letters, 2015, 13(10): 101401 Copy Citation Text

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Abstract

We experimentally and numerically demonstrate the generation of square pulses without any wave-breaking in a fiber ring laser. A segment of nonzero dispersion-shifted fiber is used to increase the laser cavity length and to optimize the parameters of the laser cavity. In the experiment, the pulse width can be tuned in a wide range from 13.5 to 119.5 ns without wave-breaking while the peak power remains almost constant. The maximum single-pulse energy is up to 65.58 nJ at a pump power of 508 mW. Numerical results are in good agreement with the experimental results. Numerical results also reveal the role of cavity length and nonlinearity in generating a square pulse without pulse breakup.

\frac{\partial u}{\partial z} = - i β u + δ \frac{\partial u}{\partial t} - i \frac{β_{2}}{2} \frac{\partial^{2} u}{\partial t^{2}} + i γ ({| u |}^{2} + \frac{2}{3} {| v |}^{2}) u + \frac{i γ v^{2} u^{*}}{3} + \frac{g - α}{2} u + \frac{g}{2 Ω_{g}} \frac{\partial^{2} u}{\partial t^{2}},

(1a)

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\frac{\partial v}{\partial z} = - i β v - δ \frac{\partial v}{\partial t} - i \frac{β_{2}}{2} \frac{\partial^{2} v}{\partial t^{2}} + i γ ({| v |}^{2} + \frac{2}{3} {| u |}^{2}) v + \frac{i γ u^{2} v^{*}}{3} + \frac{g - α}{2} v + \frac{g}{2 Ω_{g}} \frac{\partial^{2} v}{\partial t^{2}},

(1b)

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T = \sin^{2} (θ) \sin^{2} (φ) + \cos^{2} (θ) \cos^{2} (φ) + 0.5 \sin (2 θ) \sin (2 φ) \cos (ϕ_{1} + ϕ_{2}),

(2)

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Tonghui Liu, Dongfang Jia, Ying Liu, Zhaoying Wang, Tianxin Yang. Observation of wave-breaking-free square pulses in a fiber ring laser[J]. Chinese Optics Letters, 2015, 13(10): 101401

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