Transverse mode competition in gain-guided index antiguided fiber lasers

Xiangru Wang; Ying Chen; William Hageman; Gyu Ug Kim; Martin Richardson; Caidong Xiong; John Ballato; Michael Bass

doi:10.1364/JOSAB.29.000191

Journal of the Optical Society of America B
Vol. 29,
Issue 2,
pp. 191-196
(2012)
•https://doi.org/10.1364/JOSAB.29.000191

Transverse mode competition in gain-guided index antiguided fiber lasers

Xiangru Wang, Ying Chen, William Hageman, Gyu Ug Kim, Martin Richardson, Caidong Xiong, John Ballato, and Michael Bass

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Xiangru Wang, Ying Chen, William Hageman, Gyu Ug Kim, Martin Richardson, Caidong Xiong, John Ballato, and Michael Bass, "Transverse mode competition in gain-guided index antiguided fiber lasers," J. Opt. Soc. Am. B 29, 191-196 (2012)

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Table of Contents Category
- Lasers and Laser Optics
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About this Article
History
- Original Manuscript: September 2, 2011
- Revised Manuscript: November 2, 2011
- Manuscript Accepted: November 3, 2011
- Published: January 13, 2012

Abstract

Single-mode laser action has been reported previously in a gain-guided, index antiguided fiber using a scalable side pumping scheme. In this paper we demonstrate the role of transverse mode competition on laser oscillation in such a fiber laser. It enables single, lowest-order mode lasing with a beam quality of $M^{2} < 2$ when using a combination of large fiber core radius and low output coupler reflectivity previously considered to rule out gain-guided index antiguided lasing with such beam quality. In addition, the larger core radii fibers and low output coupler reflectivity enables improved slope efficiency. Both theoretical analysis and experimental results are presented demonstrating mode competition governed lasing in a gain-guided, index antiguided fiber.

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Output Coupler $R$	Mode	${\bar{g}}^{m}$ ( $m^{- 1}$ )	$g_{th}^{m}$ ( $m^{- 1}$ )	$g_{osc}^{m}$ ( $m^{- 1}$ )	$P_{out}^{m}$ (W)
90%	LP 01	3.72	1.76	3.70	17.32
	LP 11	3.38	4.47	6.41	$1.5 e - 3$
50%	LP 01	11.07	1.76	11.05	37.69
	LP 11	10.07	4.47	13.76	$5.6 e - 3$

Core Diameter	Coupler	$M^{2} x$	$M^{2} y$	Threshold Power (W)	Slope Efficiency	$P_{out}$ Max
100 μm	37%	1.60	1.44	26	4.09%	5.93
	45%	1.45	1.44	21	3.28%	4.64
	90%	1.34	1.34	12	0.62%	0.93
200 μm	37%	1.44	1.35	31	11.08%	14.04
	45%	1.31	1.31	27	7.57%	10.73
	90%	1.25	1.23	12	1.13%	1.94
300 μm	37%	1.89	1.95	27	26.4%	32.35
	45%	1.60	1.71	25	12.35%	18.19
	97%	1.32	1.35	7	0.74%	1.22

Output Coupler $R$	Mode	${\bar{g}}^{m}$ ( $m^{- 1}$ )	$g_{th}^{m}$ ( $m^{- 1}$ )	$g_{osc}^{m}$ ( $m^{- 1}$ )	$P_{out}^{m}$ (W)
90%	LP 01	3.72	1.76	3.70	17.32
	LP 11	3.38	4.47	6.41	$1.5 e - 3$
50%	LP 01	11.07	1.76	11.05	37.69
	LP 11	10.07	4.47	13.76	$5.6 e - 3$

Core Diameter	Coupler	$M^{2} x$	$M^{2} y$	Threshold Power (W)	Slope Efficiency	$P_{out}$ Max
100 μm	37%	1.60	1.44	26	4.09%	5.93
	45%	1.45	1.44	21	3.28%	4.64
	90%	1.34	1.34	12	0.62%	0.93
200 μm	37%	1.44	1.35	31	11.08%	14.04
	45%	1.31	1.31	27	7.57%	10.73
	90%	1.25	1.23	12	1.13%	1.94
300 μm	37%	1.89	1.95	27	26.4%	32.35
	45%	1.60	1.71	25	12.35%	18.19
	97%	1.32	1.35	7	0.74%	1.22

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