High-brightness semiconductor laser sources for materials processing: stacking, beam shaping, and bars

Treusch, Hans-Georg; Ovtchinnikov, A.; He, Xingyao; Kanskar, M.; Mott, Jeff; Shen, Yang

doi:10.1109/2944.883374

Cited by 56 publications

(16 citation statements)

References 36 publications

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“…Treusch et al [18] applied a high-brightness semiconductor laser and found that collimation lenses can be used to increase the brightness of the laser by a factor of two. In addition, the wavelength and polarization coupling also contributed in increasing the end brightness.…”

Section: Modification Of Optical Resonator Beam Delivery and Opticsmentioning

confidence: 99%

Understanding laser beam brightness: A review and new prospective in material processing

Shukla

Lawrence

Zhang

2015

Optics & Laser Technology

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a b s t r a c tThis paper details the importance of brightness in relation to laser beams. The 'brightness' of lasers is a term that is generally not given much attention in laser applications or in published literature. With this said, it is theoretically and practically an important parameter in laser-material processing. This study is first of a kind which emphasizes in-depth, the concept of brightness of lasers by firstly reviewing the existing literature and the progress with high brightness laser-material processes. Secondly, the techniques used to enhance the laser beam brightness are also reviewed. In addition, we review the brightness fundamentals and rationalize why brightness of lasers is an important concept. Moreover, an update on the analytical technique to determine brightness using the current empirical equations is also provided. A modified equation to determine the laser beam brightness is introduced thereafter. Furthermore, research studies previously conducted to modify laser design to affect laser beam brightness are also discussed. The paper not only involves a review of the techniques used to improve laser beam brightness but also reviews how bright lasers can be employed to enhance/improve laser process capabilities and cost reduction of the laser assisted processes in manufacturing.

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Section: Modification Of Optical Resonator Beam Delivery and Opticsmentioning

confidence: 99%

Understanding laser beam brightness: A review and new prospective in material processing

Shukla

Lawrence

Zhang

2015

Optics & Laser Technology

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“…These devices offer a wide range of applications, e.g. as efficient sources for pumping solid-state lasers 1,2 (with a high spatial and spectral quality), as direct tools for material processing 3,4 and in medicine 5 . However, limitations regarding device lifetime and reliability still limit their access to all potential application fields.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of high power laser bars investigated by spatially resolved thermoreflectance spectroscopy

Pierścińska

Pierściński

Bugajski

et al. 2007

Physica Status Solidi (a)

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In this work we present results of the analysis of thermal properties of high-power laser bars obtained by spatially resolved thermoreflectance (TR) spectroscopy.Thermoreflectance is a modulation technique relying on periodic facet temperature modulation induced by pulsed current supply of the laser. The periodic temperature change of the laser induces variation of the refractive index and consequently modulates probe beam reflectivity. The technique has a spatial resolution of about ~1 µm and can be used for temperature mapping over 300 µm × 300 µm area.Information obtained in these experiments provide an insight into thermal processes occurring at devices' facets and consequently lead to increased reliability and substantially longer lifetimes of such structures.

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“…of fields, including manufacturing and materials processing [7], [8], medicine [9], [10], and telecommunications [11], [12]. They are also used as pump lasers for solid-state lasers [13], [14], fiber amplifiers, and fiber lasers [15], [16].…”

mentioning

confidence: 99%

A Spectroscopically Resolved Photo- and Electroluminescence Microscopy Technique for the Study of High-Power and High-Brightness Laser Diodes

Bull

Andrianov

Harrison

et al. 2005

IEEE Trans. Instrum. Meas.

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Abstract-A novel and advanced characterization technique is described for performing optical studies of the luminescence properties of materials. It was developed for the investigation of semiconductor materials, including semiconductor laser diodes and photonic integrated circuits. A quantitatively calibrated, spatially and spectrally resolved imaging technique is described, which is based upon the technologies of photoluminescence microscopy and photoluminescence spectroscopy. The principles of the spectroscopically resolved photo-and electroluminescence microscopy techniques are outlined in this paper, and the developed instrument is described in detail. Design calculations used to select and set up the experimental apparatus are presented, and results are found to compare well with this analysis. Various experimental measurements are used to demonstrate the performance of the new instrument. The study of strain and defects in high-power laser diodes is presented as one of the more challenging applications of the new technique. The results presented demonstrate the ability of this technique to image photoluminescence shifts occurring in the substrate of packaged laser bars, enabling the investigation of strain, defects and their evolution with aging. Other applications of the technique include the spectroscopic measurement of near-and far-field patterns and virtual sources of laser diodes, investigations of spectral hole burning and optical scattering processes in lasers and photonic integrated circuits, and studies of organic LEDs. In the future, applications are also envisaged in medicine and the biological sciences.Index Terms-Electroluminescence microscopy, high-brightness laser diodes, high-power laser diodes, photoluminescence microscopy, quantitative imaging, spectroscopic imaging.

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High-brightness semiconductor laser sources for materials processing: stacking, beam shaping, and bars

Cited by 56 publications

References 36 publications

Understanding laser beam brightness: A review and new prospective in material processing

Understanding laser beam brightness: A review and new prospective in material processing

Thermal properties of high power laser bars investigated by spatially resolved thermoreflectance spectroscopy

A Spectroscopically Resolved Photo- and Electroluminescence Microscopy Technique for the Study of High-Power and High-Brightness Laser Diodes

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