Beam Shaping of High-power Laser Diode Arrays by Continuous Surface-relief Elements

Ehbets, P.; Herzig, H. P.; Dändliker, R.; Regnault, P.; Kjelberg, I.

doi:10.1080/09500349314550691

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…In Refs. [12,13], the general far-field intensity distribution has been derived by Fourier transform. Based on these general analytical expression, we have derived explicit analytical expressions concerning about the far-field angular intensity distribution for the emitters locating on multiple polygons.…”

Section: Introductionmentioning

confidence: 99%

Far-field characteristics of coherently combined beams emitted from arrays on multiple polygons

Shi¹,

Dou²,

Chen³

et al. 2010

Optik

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Section: Introductionmentioning

confidence: 99%

Far-field characteristics of coherently combined beams emitted from arrays on multiple polygons

Shi¹,

Dou²,

Chen³

et al. 2010

Optik

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“…Therefore a coherent beam-shaping element, a so-called random phase plate, for example, one designed by an iterative Fourier algorithm 3,4 or a coherent addition with a fan-in element, 5 is not appropriate for addressing the beam-shaping problem that is described here. The special coherence properties of the source necessitate an incoherent beamshaping method.…”

Section: Working Principlementioning

confidence: 99%

Efficient beam shaping of linear, high-power diode lasers by use of micro-optics

Schilling¹,

Herzig²,

Stauffer³

et al. 2001

Appl. Opt.

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We have designed, fabricated, and characterized a micro-optical beam-shaping device that is intended to optimize the coupling of an incoherent, linearly extended high-power diode laser into a multimode fiber. The device uses two aligned diffractive optical elements ͑DOEs͒ in combination with conventional optics. With a first prototype, we achieved an overall efficiency of 28%. Straightforward improvements, such as antireflective coatings and the use of gray-tone elements, are expected to lead to an efficiency of approximately 50%. The device is compact, and its fabrication is suited for mass production at low cost. This micro-optical device, used in a range-finder measurement system, will extend the measurement range. In addition to the direct laser writing technique, which was used for fabrication of the DOEs of the prototype, we applied two other technologies for the fabrication of the micro-optical elements and compared their performance. The technologies were multiple-projection photolithography in combination with reactive-ion etching in fused silica and high-energy beam-sensitive glass gray-tone lithography in photoresist. We found that refractive-type elements ͑gray tone͒ yield better efficiency for large deflection angles, whereas diffractive elements ͑multilevel or laser written͒ give intrinsically accurate deflection angles.

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“…1 and 2). Therefore, a coherent beamshaping element, as for example designed by an iterative Fourier algorithm, [3,4] or a coherent addition with a fan-in element, [5] are not appropriate approaches for the beamshaping problem which is addressed here. The special coherence properties of the source necessitate an incoherent beamshaping method.…”

Section: Working Principlementioning

confidence: 99%

<title>Efficient beamshaping of high-power diode lasers using micro-optics</title>

Herzig

Schilling

Stauffer³

et al. 2001

SPIE Proceedings

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We designed, fabricated and characterized a micro-optical beamshaping device, intended to optimize the coupling of an incoherent, linearly extended high-power diode-laser into a multimode fiber. The device uses two aligned micro-optical elements (DOEs) in combination with conventional optics. With a first prototype we achieved an overall efficiency of 28 %. Straightforward improvements, like antireflective coatings and the use of graytone elements, should lead to an efficiency of about 50 %. The device is compact and the fabrication is suited for mass production at low cost. We applied three different technologies for the fabrication of the micro-optical elements and compared the performance. The technologies were: direct laser writing, multiple projection photolithography in combination with reactive ion etching (RIE) in fused silica, and highenergy-beam-sensitive (HEBS) glass graytone lithography in photoresist. We found that the refractive type elements (graytone) yield better efficiency for large deflection angles, while diffractive elements give intrinsically accurate deflection angles.

show abstract

Beam Shaping of High-power Laser Diode Arrays by Continuous Surface-relief Elements

Cited by 14 publications

References 10 publications

Far-field characteristics of coherently combined beams emitted from arrays on multiple polygons

Far-field characteristics of coherently combined beams emitted from arrays on multiple polygons

Efficient beam shaping of linear, high-power diode lasers by use of micro-optics

<title>Efficient beamshaping of high-power diode lasers using micro-optics</title>

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