Abstract
Abstract The quantum defect (QD) is an important issue that demands prompt attention in high-power fiber lasers. A large QD may aggravate the thermal load in the laser, which would impact the frequency, amplitude noise and mode stability, and threaten the security of the high-power laser system. Here, we propose and demonstrate a cladding-pumped Raman fiber laser (RFL) with QD of less than 1%. Using the Raman gain of the boson peak in a phosphorus-doped fiber to enable the cladding pump, the QD is reduced to as low as 0.78% with a 23.7 W output power. To our knowledge, this is the lowest QD ever reported in a cladding-pumped RFL. Furthermore, the output power can be scaled to 47.7 W with a QD of 1.29%. This work not only offers a preliminary platform for the realization of high-power low-QD fiber lasers, but also proves the great potential of low-QD fiber lasers in power scaling.
Highlights
Owing to compact structure, high conversion efficiency and robust operation, high-power fiber lasers have attracted much research interest and been widely employed in tremendous fields [1,2,3,4]
The results have indicated that Raman fiber laser (RFL) gained by the boson peak of phosphorus-doped fiber (PDF) has the ability to realize low-Quantum defect (QD) output
We demonstrate a cladding-pumped RFL with QD reduced to
Summary
High conversion efficiency and robust operation, high-power fiber lasers have attracted much research interest and been widely employed in tremendous fields [1,2,3,4]. Benefiting from fast development of the high-brightness pump source, Raman fiber laser (RFL) has been rapidly developed and widely investigated in recent years [24,25,26,27]. RFL is a promising alternative on both high-power and low-QD fiber lasers. Up to hundreds watt-level high-power RFL in all-fiber format have been demonstrated by several independent groups [28,29,30,31]. Challenge in power scaling of RFL has been revealed and observed very recently [34,35,36,37], where further decreasing the QD of RFL is one of the promising solutions for power scaling
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