kW Fiber Lasers

Kliner, Dahv A. V.; Yu, Hongbo; Luu, Johnny; Liao, Kai-Hsiu; Segall, Jeff; Muendel, Martin H.; Shen, Jane; Kutsuris, Matt; Holdener, Don; Franke, J.; Nguyen, Kelvin; Woods, Dave; Meng, David; Vecht, David L.; Duesterberg, Richard; Xu, Long; Skidmore, J.A.; Guo, James C. Y.; Cheng, Jane; Du, Jing; Johnson, Brad; Guérin, Nicolas; Huang, Benlih; Cheng, Peter; Raju, Reddy; Lee, Kong Weng; Cai, Jason; Rossin, Victor; Zucker, Erik

doi:10.1364/ofc.2012.ow1c.3

Cited by 3 publications

(1 citation statement)

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“…IPG developed and commercialized monolithic multi-kilowatt single mode fiber lasers [4][5][6] and a record 9.6 kW CW laser power with single mode beam quality was achieved in 2009 [6]. While IPG has rarely outlined technical details of their high power fiber lasers in the literature, several other monolithic kilowatt-level fiber lasers with strict or near single mode beam quality have been reported [7][8][9]. However, the CW laser powers produced by these fiber lasers are limited to around 1 kW.…”

Section: Introductionmentioning

confidence: 99%

2.5 kW monolithic continuous wave (CW) near diffraction-limited fiber laser at 1080 nm

Fang¹,

Shi

Qin³

et al. 2014

Laser Phys. Lett.

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We demonstrate a monolithic continuous wave (CW) fiber laser source at 1080 nm, producing 2.5 kW average laser power with near diffraction-limited beam quality (M 2 < 1.3). The laser consists of a CW fiber laser oscillator and one double cladding (DC) fiber amplifier in the master oscillator-power amplifier (MOPA) configuration. The optical-to-optical conversion efficiency of the entire laser system with respect to the launched pump power is ~77.9%.

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Section: Introductionmentioning

confidence: 99%

2.5 kW monolithic continuous wave (CW) near diffraction-limited fiber laser at 1080 nm

Fang¹,

Shi

Qin³

et al. 2014

Laser Phys. Lett.

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Decreasing effective reflectivity of the output coupler in the power scaling of fiber lasers

et al. 2016

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Increasing power leads to the spectral broadening of fiber laser beams. In this effect the spectral line width of the laser beam becomes broader than that of the output coupler (OC) due to power scaling. Therefore, the effective reflectivity of the OC mirror decreases. In this paper, this phenomenon is investigated theoretically and experimentally. A Liekki Application Designer V3.3 was used for the theoretical investigation and the experiments were conducted during the fabrication of a 630W fiber laser. Given the excellent agreement between the simulation and the experimental results, a decrease in the effective reflectivity of the OC mirror was proved. The decrease in the effective reflectivity of the OC mirror changes some of the laser parameters, such as optical efficiency, longitudinal distribution of population inversion and the backward power inside the resonator. This may also lead to power instability. The effects of a decrease in the reflectivity of the OC on the mentioned parameters of the fiber laser are investigated in the present paper. Finally, recommendations for choosing appropriate OC mirror parameters in high-power (kW class) fiber lasers are suggested.

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