3kW single-mode direct diode-pumped fiber laser

Khitrov, V. V.; Minelly, J.D.; Tumminelli, R.; Petit, Vincent; Pooler, E. S.

doi:10.1117/12.2037453

Cited by 51 publications

(33 citation statements)

References 3 publications

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“…Beyond any doubt, SIF is the simplest design to implement and not known to suffer from any additional difficulties. Prior to this demonstration, a low-NA of 0.048 was reported for Ybdoped SIF [20]. Table 1 shows the comparative analysis of mode area scaling capability of SIF with different NAs.…”

Section: Discussionmentioning

confidence: 99%

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Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers

Jain¹,

Jung²,

Barua³

et al. 2015

Opt. Express

103

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Abstract:In this paper, we report the mode area scaling of a rare-earth doped step index fiber by using low numerical aperture. Numerical simulations show the possibility of achieving an effective area of ~700um 2 (including bend induced effective area reduction) at a bend diameter of 32cm from a 35μm core fiber with a numerical aperture of 0.038. An effective single mode operation is ensured following the criterion of the fundamental mode loss to be lower than 0.1dB/m while ensuring the higher order modes loss to be higher than 10dB/m at a wavelength of 1060nm. Our optimized modified chemical vapor deposition process in conjunction with solution doping process allows fabrication of an Yb-doped step index fiber having an ultra-low numerical aperture of ~0.038. Experimental results confirm a Gaussian output beam from a 35μm core fiber validating our simulation results. Fiber shows an excellent laser efficiency of ~81% and a M 2 less than 1.1. 2015 Optical Society of AmericaOCIS codes: (060.2280) Fiber design and manufacturing; (140.3510) Fiber lasers.

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Section: Discussionmentioning

confidence: 99%

“…al. has demonstrated a Yb doped SIF with NA of 0.048, although laser built with this fiber shows significant Raman generation at 3kW output power [20].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers

Jain¹,

Jung²,

Barua³

et al. 2015

Opt. Express

103

View full text Add to dashboard Cite

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“…Besides, a 3 kW laser output without PD and MI was achieved based on a low-NA fiber with a core diameter of 35 µm [54] . Very recently, Beier et al presented a narrow linewidth singlemode fiber amplifier system up to 4.4 kW with single-mode beam quality achieved by lowering the NA of the fiber to ∼0.04 [55] . With low NA, the maximum effective mode area was reached up to 1000 µm 2 [56] .…”

Section: Single-mode Operationmentioning

confidence: 99%

Development and prospect of high-power doped fibers

Wang

Chen

2018

High Pow Laser Sci Eng

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Ytterbium-doped fibers have become the optimum gain media of high-power fiber lasers thanks to a simple energy structure, which strongly reduces the excited state absorption, and a low quantum defect and a high optic-optic conversion efficiency, which means the low thermal load. In this paper, we take a review of the current state of the art in terms of Yb 3+ doped fibers for high-power fiber lasers, including the development of the fabrication techniques. The research work to overcome the challenges for Yb 3+ doped fibers, which affect the stability of output power and beam quality, will be demonstrated. Direction of further research is presented and the goal is to look for a fiber design, to boost single fiber output power, stabilize the laser power and support robust single-mode operation.

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“…In particular, remarkable output power of up to kilo-watts in emission range of 1030 nm-1100 nm have been realized one after another in recent years [2]- [6]. However, the fiber lasers emitting beyond 1100 nm attract more and more attention because of their extensive applications [7]- [10].…”

Section: Introductionmentioning

confidence: 98%

Diode-Pumped 1178-nm High-Power Yb-Doped Fiber Laser Operating at 125 C

et al. 2016

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We demonstrate a high-power Yb-doped fiber laser operating at 1178 nm based on commercial silica double-cladding fiber and laser diode (LD) pumping regime at 976 nm. It is experimentally proved that heating the active fiber is an efficient way to suppress amplified spontaneous emission (ASE) and to increase the parasitic lasing threshold in long-wavelength Yb-doped fiber lasers. By adopting output coupling fiber Bragg grating (OC FBG) with high reflectivity and heating the Yb-doped fiber to 125 C, a record output power of 31 W is obtained, and the corresponding slope efficiency is $44% with respect to the pump power. To the best of our knowledge, it is the highest output power of Yb-doped fiber lasers, which adopt commercial double-cladding active fiber and operate in the range beyond 1160 nm. Furthermore, it is first experimentally proved that the parasitic lasing threshold is related to the power of the backward ASE and the length of the active fiber.Index Terms: Yb-doped fiber laser, long wavelength, high temperature.

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3kW single-mode direct diode-pumped fiber laser

Cited by 51 publications

References 3 publications

Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers

Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers

Development and prospect of high-power doped fibers

Diode-Pumped 1178-nm High-Power Yb-Doped Fiber Laser Operating at 125 C

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