High power, high brightness, low weight diode laser pump source

Chen, Jack; Li, Juan; Shi, Min; Dong, Xiaopei; Li, Fuying; Guo, Fangjunyue; Guo, Wenbin; Wang, Baohua; Li, Shengran; Lang, Chao

doi:10.1117/12.2608481

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…In order to pump Yb-doped fiber lasers around λ = 976 nm, light must be provided within a narrow spectrum with width at 95% power content of λ∆95% < 2 nm, much narrower than the λ∆95% ~ 4…6 nm spectral width of GaAs-based diode lasers. Typically, operation with a narrow spectrum is achieved in current commercial modules by stabilizing the wavelength using an external volume-Bragg grating [see 4,5], leading to added cost and complexity in assembly and the risk of reflection-induced failure [6]. Monolithically integrated gratings inside the diode laser are an attractive cost-saving alternative, if they can be realized with sufficient output power, conversion efficiency and reliability.…”

Section: Fbh Stack Technology and High Brightness Dbr Lasersmentioning

confidence: 99%

“…Yb-doped fiber lasers can be especially efficiently pumped using diode lasers with operating wavelength around λ = 976 nm, delivered via 200-µm core fibers, to pump the zero-phonon-line [3], for reduced heating in the fiber laser compared to pumping around λ = 915 nm. There are already various commercial modules on the market supporting this need [4,5]. While these modules use different opto-mechanical designs, they all have in common, that the beams of several emitters are collimated individually and arranged and spatially combined with various mirrors.…”

Section: Introductionmentioning

confidence: 99%

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High brightness pumps for fiber lasers based on monolithically grating stabilized diode lasers

Wilkens,

Basler,

Eppich

et al. 2024

High-Power Diode Laser Technology XXII

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Innovation in diode laser design and technology, assembly techniques and optical design are used to realize highbrightness pump modules for application in pumping of fiber lasers. In a first demonstration, monolithically gratingstabilized diode lasers with wavelength around 970 nm are integrated into prototype modules that deliver 500 W of continuous wave TE-polarized optical power at a conversion efficiency > 55% within a spectral width of 1.2 nm (95% power) in a narrow beam, suitable for low-loss coupling into a 200-µm core fiber. An especially simple opto-mechanical configuration is developed, without need for external volume Bragg gratings.

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Section: Fbh Stack Technology and High Brightness Dbr Lasersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High brightness pumps for fiber lasers based on monolithically grating stabilized diode lasers

Wilkens,

Basler,

Eppich

et al. 2024

High-Power Diode Laser Technology XXII

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“…In order to reduce the complexity of the beam-shaping systems, the fiber coupling is often adopted, which is an important means to achieve flexible laser transmission. Besides, through the beam combining technology, the output power of the fiber can be increased by dozens of times higher than that of a single broad-area LD [3][4][5] . Finally, the elliptical optical field of the broad-area LD can be transformed into a circular and uniform pattern by the homogenization of the optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Designs of fiber coupling without collimation based on photonic crystal laser diodes

Xing

Zhou

Chen

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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We have designed a fiber coupling method based on the spatial beam combining of the Photonic Crystal (PC) Laser Diode (LD). The PC LD with a small fast-axis divergence angle makes it possible to reduce the requirements for the numerical aperture and the processing precision of the optical elements, increase the alignment tolerance of components, reduce the difficulty of shaping, and improve the product yield. In the module, there is no need for the collimation of the fast-axis and slow-axis beams, which can be simultaneously focused into the optical fiber through an aspheric cylindrical lens. The simulated results, obtained by the ray tracing method, have shown a coupling efficiency of around 91.4% when the PC LD is coupled into a fiber with a core diameter of 105 μm and the numerical aperture of 0.22. Then, we have performed the experiments, and the coupling efficiency of 71.5% has been achieved. By analyzing the deviation of the simulated and experimental coupling efficiency, we have proposed several solutions. Finally, according to the strategy of this beam shaping, we also list several promising arrangements, which further prove that the beam shaping method possesses broad application prospects.

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“…The brightness of diode laser pump source is one of the key factors in fiber laser power expansion [1], and the brightness of the chip directly determines the brightness of the pump source, but the brightness improvement of the chip is a slow process [2]. The brightness of the pump source can also be improved through polarization beam combining and wavelength beam combining technologies.…”

Section: Introductionmentioning

confidence: 99%

650W dual-wavelength locked high brightness diode laser pump source

Chen¹,

Li²,

Shi³

et al. 2023

Components and Packaging for Laser Systems IX

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On last year's SPIE conference, BWT has launched a pump source in weight around 500g, which was locked at 976nm, output 420W from a 135μm diameter and NA 0.22 fiber. In order to meet the need of higher output power pumping of fiber lasers, BWT has achieved 650W output from a 135μm diameter and NA0.22 fiber with a diode laser locked at 969nm and 982nm based on dense spatial beam combination (DSBC) and wavelength beam combination. In the absorption spectrum of Yb 3+ ions, 969nm and 982nm have lower absorption coefficients than 976nm,. The active fiber with the same doping concentration will produce less heat accumulation per unit length, which has an obvious effect on improving the TMI threshold (transverse mode instability) and increasing the single-mode fiber laser power. With the enhancement of pump source brightness and the improvement of active fiber doping process and wave-guide structure, the power of single mode fiber laser directly pumped by diode laser is expected to exceed 10kW in the future.

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High power, high brightness, low weight diode laser pump source

Cited by 3 publications

References 2 publications

High brightness pumps for fiber lasers based on monolithically grating stabilized diode lasers

High brightness pumps for fiber lasers based on monolithically grating stabilized diode lasers

Designs of fiber coupling without collimation based on photonic crystal laser diodes

650W dual-wavelength locked high brightness diode laser pump source

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