Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser

Jiangming Xu; Jun Ye; Wei Liu; Jian Wu; Hanwei Zhang; Jinyong Leng; Pu Zhou

doi:10.1364/PRJ.5.000598

Photonics Research, Volume. 5, Issue 6, 598(2017)

Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser

Jiangming Xu^1,2,3, Jun Ye¹, Wei Liu¹, Jian Wu^1,2, Hanwei Zhang^1,2, Jinyong Leng^1,2, and Pu Zhou^1,2、*

Author Affiliations

¹College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

²Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China

³e-mail: jmxu1988@163.com

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Figures & Tables(7)

Fig. 1. Experimental setup of the counterpumped RFL. Cir, circulator.

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Fig. 2. Power and spectrum characteristics of the counterpumped RFL. (a) Corresponding power of first- and second-order Stokes light as functions of pump power. (b) Output spectra at different pump levels.

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Fig. 3. Temporal characteristics of output pulse. Signals of output first-order Stokes light at (a) 5.36 and (b) 6.51 W pump powers. (c) Shapes of output first- and second-order Stokes light at 12.75 W pump level. (d) Evolution of period as function of pump power.

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Fig. 4. RF spectra of (a) first-order Stokes light and (c) second-order Stokes light around fundamental repetition frequency with a resolution of 20 Hz. Long-time recording of RF spectra of (b) first-order Stokes light and (d) second-order Stokes light in the range of 0–1 MHz with a resolution of 200 Hz and length of 100 s.

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Fig. 5. Calculated (a) output pulse and (b) pulsation period.

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Fig. 6. Spatiotemporal distributions of pump light and Stokes light at threshold of first-order Stokes light. Insertion graphs of (a) present the temporal evolution of backward pump power at three different locations. (a) Backward pump power. (b) Forward pump power. (c) Backward Stokes power. (d) Forward Stokes power.

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Table 1. Parameters for the Numerical Calculations

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Table 1. Parameters for the Numerical Calculations

Parameter	Value	Unit
$λ_{0}, λ_{1}, λ_{2}$	1.0792, 1.134, $1.195$	$10^{- 6}$ m
$g_{R 1}, g_{R 2}$	6.3, $6.0$	$10^{- 4} m^{- 1} W^{- 1}$
$a_{0}, a_{1}, a_{2}$	2.7, 2.2, $1.8$	$10^{- 4} m^{- 1}$
$ϵ_{0}, ϵ_{1}, ϵ_{2}$	6.5, 6, $5.5$	$10^{- 7} m^{- 1}$
$Δ ν_{1}, Δ ν_{2}$	0.55, $1.00$	$10^{12}$ Hz
T	298	K
$R_{L 0}, R_{L 1}, R_{L 2}$	0.99, 0.9, 0.5
$R_{R 0}, R_{R 1}, R_{R 2}$	$2.1 \times 10^{- 5}$
$T_{R 0}, T_{R 1}, T_{R 2}$	0.95, 0.89, 0.82

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Jiangming Xu, Jun Ye, Wei Liu, Jian Wu, Hanwei Zhang, Jinyong Leng, Pu Zhou. Passively spatiotemporal gain-modulation-induced stable pulsing operation of a random fiber laser[J]. Photonics Research, 2017, 5(6): 598

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Paper Information

Category: Lasers and Laser Optics

Received: Jul. 12, 2017

Accepted: Aug. 28, 2017

Published Online: Dec. 7, 2017

The Author Email: Pu Zhou (zhoupu203@163.com)

DOI:10.1364/PRJ.5.000598

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology