Experimental measurements of the origin of self-phasing in passively coupled fiber lasers

Optics Letters
Hung-Sheng ChiangJ R Leger

Abstract

We have directly measured the intensity distribution, gain, and induced phase shift between two fiber lasers that are coherently combined by a Dammann grating. The induced phase shift between the lasers has been shown to approximately cancel out any applied phase error introduced into the cavity, allowing the combined resonator to operate at an efficient low-loss state. We show that the origin of this self-phasing stems from a redistribution of power between the two lasers. The resulting difference in circulating intensity produces a differential change in saturated gain, which in turn produces a differential Kramers-Kronig phase shift that effectively cancels the applied phase error.

References

Aug 12, 2005·Optics Letters·Johan BoulletWilfried Blanc
Jan 27, 2003·Optics Express·David SabourdyD Pureur
Nov 28, 2013·Optics Letters·Erik J BochoveChristopher J Corcoran
Dec 11, 2013·Optics Letters·Hung-Sheng ChiangJayanta Sahu
Apr 11, 2014·Optics Express·Christopher J Corcoran, Frederic Durville

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Citations

May 3, 2018·Optics Express·W Minster Kunkel, James R Leger
Nov 7, 2019·Optics Express·Raphael FlorentinAlain Barthelemy

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