Optimized VCSELs for high-power arrays

Moench, Holger; Kolb, Johanna; Engelhardt, Andreas P.; Gerlach, Philipp; Jaeger, Roland; Pollmann‐Retsch, Jens; Weichmann, Ulrich; Witzigmann, Bernd

doi:10.1117/12.2037608

Cited by 8 publications

(10 citation statements)

References 8 publications

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“…Higher efficiency has a significant impact on lower cost per power (€/W). The path to higher efficiency is already described elsewhere [3,11,12,13]. It should be noted that the reported system efficiency of VCSELs of 40-50% is almost on par with alternative solutions using edge emitters and requiring additional fiber delivery and homogenizing optics [14,15 Next to a good efficiency, heat removal is critical in order to realize low cost systems at high packing density.…”

Section: Technology Outlookmentioning

confidence: 91%

High-power VCSEL systems and applications

et al. 2015

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Easy system design, compactness and a uniform power distribution define the basic advantages of high power VCSEL systems. Full addressability in space and time add new dimensions for optimization and enable "digital photonic production". Many thermal processes benefit from the improved control i.e. heat is applied exactly where and when it is needed. The compact VCSEL systems can be integrated into most manufacturing equipment, replacing batch processes using large furnaces and reducing energy consumption. This paper will present how recent technological development of high power VCSEL systems will extend efficiency and flexibility of thermal processes and replace not only laser systems, lamps and furnaces but enable new ways of production.High power VCSEL systems are made from many VCSEL chips, each comprising thousands of low power VCSELs. Systems scalable in power from watts to multiple ten kilowatts and with various form factors utilize a common modular building block concept. Designs for reliable high power VCSEL arrays and systems can be developed and tested on each building block level and benefit from the low power density and excellent reliability of the VCSELs. Furthermore advanced assembly concepts aim to reduce the number of individual processes and components and make the whole system even more simple and reliable.

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Section: Technology Outlookmentioning

confidence: 91%

High-power VCSEL systems and applications

et al. 2015

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“…At first, a densely packed VCSEL array is separated from the wafer. On one chip with a footprint of 4 mm² there are ≈ 2000 of the Ø8 µm VCSELs arranged [12]. 2.…”

Section: Power Scaling Conceptsmentioning

confidence: 99%

“…3. Those stacks are afterwards connected to modules with up to 9.6 kW output and an emission area of 209 x 40 mm² [12]. …”

Section: Power Scaling Conceptsmentioning

confidence: 99%

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Brightness and average power as driver for advancements in diode lasers and their applications

et al. 2015

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Spatial and spectral emission characteristics and efficiency of high-power diode laser (HPDL) based pump sources enable and define the performance of the fundamental solid state laser concepts like disk, fiber and slab lasers. HPDL are also established as a versatile tool for direct materials processing substituting other laser types like CO2 lasers and lamp pumped solid state lasers and are starting to substitute even some of the diode pumped solid state lasers. Both, pumping and direct applications will benefit from the further improvement of the brightness and control of the output spectrum of HPDL. While edge emitting diodes are already established, a new generation of vertical emitting diode lasers (VCSELs) made significant progress and provides easy scalable output power in the kW range. Beneficial properties are simplified beam shaping, flexible control of the temporal and spatial emission, compact design and low current operation. Other characteristics like efficiency and brightness of VCSELs are still lagging behind the edge emitter performance. Examples of direct applications like surface treatment, soldering, welding, additive manufacturing, cutting and their requirements on the HPDL performance are presented. Furthermore, an overview on process requirements and available as well as perspective performance of laser sources is derived

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“…3,4 Large 2D arrays of VCSELs have been used as illuminators and for industrial thermal processing. 5,6 Single VCSEL devices generally operate at optical output powers of several mW, especially when designed for data rates of 10 Gb/s or higher. Large optical output powers have been attained by building simultaneously-addressed arrays of VCSELs on common substrates or on multiple substrates.…”

Section: Vcsel Array Technologymentioning

confidence: 99%

High-speed and scalable high-power VCSEL arrays and their applications

Warren¹,

Carson²,

Joseph³

et al. 2015

SPIE Proceedings

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A unique architecture for two-dimensional arrays of VCSELs that allow for simultaneous high-power output and highbandwidth modulation has been developed for a variety of applications. The arrays use integrated micro-lenses for beam shaping and control, and to enable incoherent beam combining to make compact, high-brightness sources with low coherence noise. The fabrication and performance of the laser arrays are reviewed and sample applications are discussed. VCSEL ARRAY TECHNOLOGYVertical Cavity Surface Emitting Lasers (VCSELs) have been used in short-wavelength multi-mode fiber optic communications systems for over twenty years. Individual devices have achieved efficient operation with modulation speeds in excess of 40 Gb/s at both the 850 nm and 980 nm wavelengths. 1,2 VCSELs have also been shown to be effective and robust in extreme temperature and radiation environments. 3,4 Large 2D arrays of VCSELs have been used as illuminators and for industrial thermal processing. 5,6 Single VCSEL devices generally operate at optical output powers of several mW, especially when designed for data rates of 10 Gb/s or higher. Large optical output powers have been attained by building simultaneously-addressed arrays of VCSELs on common substrates or on multiple substrates. 7,8 These arrayed devices are usually designed for low modulation bandwidth. The primary limiting factor is additive bulk capacitance when the individual VCSEL devices are combined into an array for parallel operation.Previously, we described a back-emitting VCSEL array technology that is scalable to >100 mW in power output, yet can be modulated at up to 10 Gb/s. 9 Here we present results that apply to the use of this approach in two-dimensional VCSEL arrays for short range NIR illumination and 3D flash LIDAR.

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Optimized VCSELs for high-power arrays

Cited by 8 publications

References 8 publications

High-power VCSEL systems and applications

High-power VCSEL systems and applications

Brightness and average power as driver for advancements in diode lasers and their applications

High-speed and scalable high-power VCSEL arrays and their applications

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