Beyond blue pico laser: development of high power blue and low power direct green

Vierheilig, Clemens; Eichler, Christoph; Tautz, Soenke; Lell, A.; Müller, Jens; Kopp, F.; Stojetz, Bernhard; Hager, Thomas; Brüderl, G.; Avramescu, Adrian; Lermer, Teresa; Ristić, Jelena; Strauß, Uwe

doi:10.1117/12.917469

Cited by 25 publications

(15 citation statements)

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“…The prototypical high‐efficiency blue LD (pulsed at 80 °C) used for modeling is from Osram and is described in Ref. . Just as for the LED, physical parameters available in the literature are taken as starting values to make a best fit to the PCE LD .…”

Section: State‐of‐the‐art Power‐conversion Efficiencies: Blue Ldsmentioning

confidence: 99%

“…Above the lasing threshold, parasitic nonradiative recombination processes, including those likely responsible for efficiency droop in LEDs, are clamped at their rates at lasing threshold. Indeed, at high input power densities state‐of‐the‐art, high‐power, blue, edge‐emitting LDs already have reasonably high (30%) power‐conversion efficiencies, with the promise someday of even higher efficiencies. At shorter purple wavelengths (∼405 nm), even higher power‐conversion efficiencies (∼38.5%) have been demonstrated , though this wavelength is too short to be effective as the blue part of a composite white spectrum.…”

Section: Introductionmentioning

confidence: 99%

“…Power‐conversion efficiencies versus input power density of a state‐of‐the‐art high‐efficiency blue LED and a state‐of‐the‐art high‐efficiency blue LD . The efficiency of the LED rapidly declines at high input power densities and is eventually overtaken by the efficiency of the LD.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between blue lasers and light‐emitting diodes for future solid‐state lighting

Wierer

Tsao

Sizov

2013

Laser & Photonics Reviews

509

244

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Solid‐state lighting (SSL) is now the most efficient source of high color quality white light ever created. Nevertheless, the blue InGaN light‐emitting diodes (LEDs) that are the light engine of SSL still have significant performance limitations. Foremost among these is the decrease in efficiency at high input current densities widely known as “efficiency droop.” Efficiency droop limits input power densities, contrary to the desire to produce more photons per unit LED chip area and to make SSL more affordable. Pending a solution to efficiency droop, an alternative device could be a blue laser diode (LD). LDs, operated in stimulated emission, can have high efficiencies at much higher input power densities than LEDs can. In this article, LEDs and LDs for future SSL are explored by comparing: their current state‐of‐the‐art input‐power‐density‐dependent power‐conversion efficiencies; potential improvements both in their peak power‐conversion efficiencies and in the input power densities at which those efficiencies peak; and their economics for practical SSL.

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Section: State‐of‐the‐art Power‐conversion Efficiencies: Blue Ldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison between blue lasers and light‐emitting diodes for future solid‐state lighting

Wierer

Tsao

Sizov

2013

Laser & Photonics Reviews

509

244

View full text Add to dashboard Cite

show abstract

“…Switching to direct green light emitting diode lasers is still challenging. Indium gallium nitride (InGaN) based laser diodes emitting up to 170 mW (CW) were demonstrated but their performance is limited by the laser crystal qualities [84][85][86][87]. As an alternative, 1060 nm DBR-tapered diode lasers were presented [23].…”

Section: Biomedical Applications In the Visible Spectral Rangementioning

confidence: 99%

Diode laser based light sources for biomedical applications

Müller

Marschall

Jensen

et al. 2012

Laser & Photonics Reviews

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Diode lasers are by far the most efficient lasers currently available. With the ever-continuing improvement in diode laser technology, this type of laser has become increasingly attractive for a wide range of biomedical applications. Compared to the characteristics of competing laser systems, diode lasers simultaneously offer tunability, high-power emission and compact size at fairly low cost. Therefore, diode lasers are increasingly preferred in important applications, such as photocoagulation, optical coherence tomography, diffuse optical imaging, fluorescence lifetime imaging, and terahertz imaging. This review provides an overview of the latest development of diode laser technology and systems and their use within selected biomedical applications. 670 nm external cavity diode laser for Raman spectroscopy built on a 13 × 4 mm 2 microbench (Copyright FBH/Schurian.com).

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“…Growing interest in applications such as pico-size mobile projection led to the commercialization of GaN-based true blue and green laser diodes. [1][2][3][4] Typical applications require a good beam quality, e.g., a smooth Gaussian shape of the transversal (fast axis) and lateral (slow axis) far-field, in order to focus the laser beam properly. For GaN-based laser diodes, the suppression of a substrate mode is important to prevent a dip in the Gaussian-shaped transversal far-field.…”

mentioning

confidence: 99%

Analysis of perturbations in the lateral far-field of blue InGaN laser diodes

Kopp

Lell

Eichler

et al. 2013

Applied Physics Letters

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The origin of perturbations in the Gaussian-shaped lateral far-field of blue InGaN laser diodes is explored. Near-field measurements reveal that small stray light intensity peaks beside the ridge waveguide exist. In order to prove quantitatively the impact of this stray light on the far field, an exemplary beam propagation method simulation is performed. Moreover, laser cuts as a chip technological process to block stray light from the out-couple facet are presented. These laser cuts result in a significant improvement of the lateral far-field

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Beyond blue pico laser: development of high power blue and low power direct green

Cited by 25 publications

References 0 publications

Comparison between blue lasers and light‐emitting diodes for future solid‐state lighting

Comparison between blue lasers and light‐emitting diodes for future solid‐state lighting

Diode laser based light sources for biomedical applications

Analysis of perturbations in the lateral far-field of blue InGaN laser diodes

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