Investigation of collimating and focusing lenses’ impact on laser diode stack beam parameter product

Yu, Hao; Liu, Yu; Braglia, Andrea; Rossi, Giammarco; Perrone, Guido

doi:10.1364/ao.54.010240

Cited by 31 publications

(5 citation statements)

References 10 publications

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“…Before starting the training and test phases, we characterised a commercial laser diode to identify the parameters of the source. For this goal we used two and three lens configurations [21] to measure the 1/e 2 intensity beam waist radius and the 1/e 2 intensity divergence along the FA of a laser diode, finding at 8 A driving current the values reported in Tab. 1.…”

Section: Experimental Validation Of the Approachmentioning

confidence: 99%

Application of Gaussian beam ray-equivalent model and back-propagation artificial neural network in laser diode fast axis collimator assembly

Rossi²,

Braglia³

et al. 2016

Appl. Opt.

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The paper presents the development of a tool based on a back-propagation artificial neural network to assist in the accurate positioning of the lenses used to collimate the beam from semiconductor laser diodes along the so-called fast axis. After training using a Gaussian beam ray-equivalent model, the network is capable of indicating the tilt, decenter, and defocus of such lenses from the measured field distribution, so the operator can determine the errors with respect to the actual lens position and optimize the diode assembly procedure. An experimental validation using a typical configuration exploited in multi-emitter diode module assembly and fast axis collimating lenses with different focal lengths and numerical apertures is reported.

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Section: Experimental Validation Of the Approachmentioning

confidence: 99%

Application of Gaussian beam ray-equivalent model and back-propagation artificial neural network in laser diode fast axis collimator assembly

Rossi²,

Braglia³

et al. 2016

Appl. Opt.

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“…This method, even if is quite simple to be implemented, worsens the beam quality, so that the power up-scaling is limited by the maximum acceptable degradation. 7 Leaving more complicated architectures like the coherent beam combining, 8 the beam quality degradation can be avoided with the polarization multiplexing, but the up-scaling is limited to a factor slightly less than two. A third option that allows solving both the beam quality degradation and the power up-scaling limitation is the spectral (or wavelength) multiplexing for which a dispersive optical element, usually a dichroic mirror, is used to spatially overlap multiple beams at different wavelengths.…”

Section: Introductionmentioning

confidence: 99%

In-fiber stabilization of high-power blue multiemitter modules

Serafini,

Cavagnetto,

Zaimovic

et al. 2024

High-Power Diode Laser Technology XXII

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“…In the beam shaping method of the conventional fiber-coupled module [8][9] , the beam arrangement is performed by using the step height difference of the heat sink. First, the fast-axis and the slow-axis components of the beam are collimated, respectively.…”

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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Investigation of collimating and focusing lenses’ impact on laser diode stack beam parameter product

Cited by 31 publications

References 10 publications

Application of Gaussian beam ray-equivalent model and back-propagation artificial neural network in laser diode fast axis collimator assembly

Application of Gaussian beam ray-equivalent model and back-propagation artificial neural network in laser diode fast axis collimator assembly

In-fiber stabilization of high-power blue multiemitter modules

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

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