&lt;title&gt;Beam shaping and fiber coupling of high-power diode laser arrays&lt;/title&gt;

Ehlers, Bodo; Du, Keming; Baumann, Markus; Treusch, Hans-Georg; Loosen, Peter; Poprawe, Reinhart

doi:10.1117/12.281128

Cited by 24 publications

(14 citation statements)

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“…In 1998, H-G.Treusch and others of Germany used a reflective plastic and step-shaped lens plastic system on the LD line array as shown in Figure 1 [2] . First they took use of the non-spherical micro-lens on the fast axis direction collimator.…”

Section: Technology Of Semiconductor Laser Beam Shapingmentioning

confidence: 99%

Beam shaping of stack pulse laser diodes

Xin

Zhang

et al. 2007

SPIE Proceedings

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The research on beam shaping of stack pulse laser diodes (LDs), which have little emitter interval and bigger discreteness, by means of the technology of photolithography, filming, precision position adjusting and fiber cylindrical lens array, and on relative technologies are introduced in this paper. To obtain high peak power, which is in need of application fields such as laser ranging, laser fuse, laser guidance, gate imaging and laser radar, direct stacking pulse LDs are widely adopted, but the research on the relative beam shaping technology is done seldom. Owing to the micro-lens is processed once only during the fabrication and the range interval of it is fixed, technologies now available is difficult to take account of beam shaping and the interval discreteness of stack pulse LDs. The most advantageous of fiber cylindrical lens array introduced in this paper is that it can adjust precisely every unit in the array respectively according to the real emitting interval of stack pulse laser diodes, and carry out beam shaping effectively. After that the high effectively coupling of multi-mode fiber can be realized. Thus the practical effect of stack pulse LDs is improved in a large degree.

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Section: Technology Of Semiconductor Laser Beam Shapingmentioning

confidence: 99%

Beam shaping of stack pulse laser diodes

Xin

Zhang

et al. 2007

SPIE Proceedings

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“…The value of the BPP decides the beam quality of the diode lasers, the BPP smaller, the better the beam quality. (2) The BPP of the fast axis is too different from that of the slow axis, and it is unable to make the beam quality of both axes evenly by traditional optical system, so it must adopt the method of beam shaping for rearrangement of the beam. At present, the beam shaping methods that have been reported to improve the beam quality of diode lasers are as follows: refraction shaping method, reflection shaping method, refraction and reflection combining method, stack of micro-chip prism shaping method.…”

Section: Beam Shapingmentioning

confidence: 99%

2000W high beam quality diode laser for direct materials processing

et al. 2011

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This article describes high beam quality and kilowatt-class diode laser system for direct materials processing, using optical design software ZEMAX ® to simulate the diode laser optical path, including the beam shaping, collimation, coupling, focus, etc.. In the experiment, the diode laser stack of 808nm and the diode laser stack of 915nm were used for the wavelength coupling, which were built vertical stacks up to 16 bars. The threshold current of the stack is 6.4A, the operating current is 85A and the output power is 1280W. Through experiments, after collimating the diode laser beam with micro-lenses, the fast axis BPP of the stack is less than 60mm·mrad, and the slow-axis BPP of the stack is less than 75mm·mrad. After shaping the laser beam and improving the beam quality, the fast axis BPP of the stack is still 60mm·mrad, and the slow-axis BPP of the stack is less than 19mm·mrad. After wavelength coupling and focusing, ultimately the power of 2150W was obtained, focal spot size of 1.5mm * 1.2mm with focal length 300mm. The laser power density is 1.2×10 5 W/cm 2 , and that can be used for metal remelting, alloying, cladding and welding. The total optical coupling conversion efficiency is 84%, and the total electrical -optical conversion efficiency is 50%.

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“…By imaging the slow axis of the ministack on the first microstep mirror, the intensity at the steps' edges amounts to zero. Thereby diffraction losses as well as geometric losses at the edges can be avoided which normally occur if the slow axis is not imaged 6 . The optical layout of the slow axis imaging system is shown in figure 6.…”

Section: Optical Design Of the Fiber Coupled Diode Laser Modulementioning

confidence: 99%

High-peak-power fiber coupled super-pulsed diode lasers

et al. 2009

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Diode lasers are frequently used for numerous applications demanding high cw average power in the kW region and comparably low brightness. These applications include polymer welding, transformation hardening of metals and medical applications. Compared to solid state lasers, diode lasers can not be efficiently q-switched due to their low upper state life time. Therefore diode lasers are usually not suited for applications requiring high peak power like marking and coating removal. To overcome this problem, we have developed a novel electrically pulsed diode laser source. If the pulses are comparably short in the region of a few hundred nanoseconds, diode lasers can be operated with a current five to ten times higher than the maximum cw current. This so called super-pulse mode of operation broadens the field of applications of high power diode lasers towards applications usually reserved for q-switched solid state lasers. To benefit from the improved brightness delivered by the super-pulsed diode lasers for materials processing, a state of the art beam forming optics is required. In this paper, we will demonstrate the design of a super-pulsed diode laser source consisting of four diode laser bars coupled into a 100 µm NA=0.2 optical fiber. This module is designed for an output power of 500 W. To select diode laser bars appropriate for the super-pulse mode of operation, different diode laser bars have been tested with peak currents up to ten times higher than the rated cw current. Material processing results with super-pulsed diode lasers will be presented.

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<title>Beam shaping and fiber coupling of high-power diode laser arrays</title>

Cited by 24 publications

References 0 publications

Beam shaping of stack pulse laser diodes

Beam shaping of stack pulse laser diodes

2000W high beam quality diode laser for direct materials processing

High-peak-power fiber coupled super-pulsed diode lasers

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