A high-brightness QCW pump source using a pre-aligned GRIN lens array with refractive beam correction

McBride, R.; Baker, H. J.; Neron, Jean-Luc; Doric, Sead; Mariottini, C.; Nava, Elisur Arteaga; Stucchi, Emanuele; Milanesi, Paolo

doi:10.1117/12.765485

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Manufacturing imperfections in the flatness of the diode bars, so called "smile", is transformed into angle variations after the fast-axis microlens, and dominate the overall linewidth of the wavelengthlocked laser output [8]. In order to remove this remaining variation, we characterized residual imperfections emitter-by-emitter in the output of each laser bar stack following a prescription by McBride [10]. Two parameters were measured: angular deflections caused by laser bar "smile" and greaterthan-optimal divergence due to microlens distance variations.…”

Section: Methodsmentioning

confidence: 99%

Polarized Xe129 for medical imaging

Hersman¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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Section: Methodsmentioning

confidence: 99%

Polarized Xe129 for medical imaging

Hersman¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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“…Rather than hand-selecting bars with Stepped-mirror adjusts the focus of separate bars on an angled grating, with concomitant benefit of reducing dark regions between bars (green represents collimated fast-axis rays, red represent convergence of slow axis in the plane perpendicular to the page) minimal smile, we adopted a more scalable approach. Using a beam-profile camera, we measured the unique deflections of each emitter of every bar in the stack, and also characterized whether their divergences had been truly optimized by the fast-axis collimating lens [9] . A custom phase plate was fabricated [10] based on these measurements to compensate for these imperfections.…”

Section: Wavelength Locking a Diode Bar Stack Using A Stepped-mirrormentioning

confidence: 99%

Scalable pump source for diode pumped alkali laser

Hersman

Distelbrink

Ketel

et al. 2014

High Energy/Average Power Lasers and Intense Beam Applications VII

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External cavity diode laser systems are well-suited for diode pumped alkali laser (DPAL) systems due to their high power efficiency and excellent wavelength control under changing thermal loads. By conditioning the characteristics of feedback power, external cavities can narrow the spectral bandwidth and limit transverse modes of diode laser bars. Existing configurations typically use low-efficiency diffraction gratings at the Littrow angle to send back to the diodes a small fraction of the power, while directing the majority of the power forward in the output beam. We previously reported that a stepped mirror allows a single external cavity to condition the output beams of a stack of diode array bars. In this report, we describe a new approach that could use a single external cavity to condition the output beams of several hundred diode array bars. A high efficiency grating is used to feedback essentially all the power in the external cavity, and power splitters then distribute the power to multiple diode array stacks. A 384 bar module capable of 20 kW power output into a modelimited slowly diverging beam with a spectral width below 0.050 nm has been designed and proposed for use in a DPAL. A 50 bar 3 kW prototype is currently being assembled.

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“…This artifact is called the "smile" and produces a nonlinear array of emitters, which makes beam shaping and fiber coupling a difficult task [15]. In order to correct wavefront errors caused by defocus, aberrations, and misalignment of the source and lens, corrector phase plates can be used [16]. More about beam shaping is discussed in Section 6.…”

Section: A Edge-emitting Laser Diodesmentioning

confidence: 99%

Laser-based displays: a review

2010

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After the invention of lasers, in the past 50 years progress made in laser-based display technology has been very promising, with commercial products awaiting release to the mass market. Compact laser systems, such as edge-emitting diodes, vertical-cavity surface-emitting lasers, and optically pumped semiconductor lasers, are suitable candidates for laser-based displays. Laser speckle is an important concern, as it degrades image quality. Typically, one or multiple speckle reduction techniques are employed in laser displays to reduce speckle contrast. Likewise, laser safety issues need to be carefully evaluated in designing laser displays under different usage scenarios. Laser beam shaping using refractive and diffractive components is an integral part of laser displays, and the requirements depend on the source specifications, modulation technique, and the scanning method being employed in the display. A variety of laser-based displays have been reported, and many products such as pico projectors and laser televisions are commercially available already.

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A high-brightness QCW pump source using a pre-aligned GRIN lens array with refractive beam correction

Cited by 5 publications

References 3 publications

Polarized Xe129 for medical imaging

Polarized Xe129 for medical imaging

Scalable pump source for diode pumped alkali laser

Laser-based displays: a review

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