Optimization of fiber coupling in ultra-high power pump modules at λ = 980 nm

Sverdlov, B.; Pfeiffer, H.; Zibik, E. A.; Mohrdiek, S.; Pliska, T.; Agresti, M.; Lichtenstein, N.

doi:10.1117/12.2003999

Cited by 13 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a long-known technique, with W ~ 3...5 µm used to ensure laterally single mode operation (e.g. in [3]). As discussed in [19], W = 30 µm enables BPP ≤ 2 mm×mrad to be sustained to P op ~ 8 W, enabled by the use of advanced vertical layer designs (to sustain high η E to high current densities) and facet passivation (for reliability at high output power densities).…”

Section: Status Of Distributed-feedback Narrow-stripe Ba Lasers (Dfb-mentioning

confidence: 99%

“…This corresponds to a lateral (slow-axis) linear brightness, B lin = P op / BPP = 3.3 W/mm×mrad [2], where BPP = 3 mm×mrad is given by BPP = 0.25 × Θ L 95% × W 95% and W 95% is the emission aperture at 95% power content. The brightness of these devices is comparable to laterally single mode lasers, which operate at P op ~ 1 W and diffraction limited BPP ~ 0.3 mm×mrad [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of high-power diode lasers with beam parameter product below 2 mm×mrad within the BRIDLE project

Crump

Decker

Winterfeldt

et al. 2015

High-Power Diode Laser Technology and Applications XIII

View full text Add to dashboard Cite

High power broad-area diode lasers are the most efficient source of optical energy, but cannot directly address many applications due to their high lateral beam parameter product BPP = 0.25 × Θ L 95% × W 95% (Θ L 95% and W 95% are emission angle and aperture at 95% power content), with BPP > 3 mm×mrad for W 95%~9 0µm. We review here progress within the BRIDLE project, that is developing diode lasers with BPP < 2 mm×mrad for use in direct metal cutting systems, where the highest efficiencies and powers are required. Two device concepts are compared: narrow-stripe broad-area (NBA) and tapered lasers (TPL), both with monolithically integrated gratings. NBAs use W 95% ~ 30 µm to cut-off higher order lateral modes and reduce BPP. TPLs monolithically combine a single mode region at the rear facet with a tapered amplifier, restricting the device to one lateral mode for lowest BPP. TPLs fabricated using ELoD (Extremely Low Divergence) epitaxial designs are shown to operate with BPP below 2mm×mrad, but at cost of low efficiency (<35%, due to high threshold current). In contrast, NBAs operate with BPP < 2 mm×mrad, but maintain efficiency >50% to output of > 7 W, so are currently the preferred design. In studies to further reduce BPP, lateral resonant anti-guiding structures have also been assessed. Optimized anti-guiding designs are shown to reduce BPP by 1 mm×mrad in conventional 90 µm stripe BA-lasers, without power penalty. In contrast, no BPP improvement is observed in NBA lasers, even though their spectrum indicates they are restricted to single mode operation. Mode filtering alone is therefore not sufficient, and further measures will be needed for reduced BPP.

show abstract

Section: Status Of Distributed-feedback Narrow-stripe Ba Lasers (Dfb-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of high-power diode lasers with beam parameter product below 2 mm×mrad within the BRIDLE project

Crump

Decker

Winterfeldt

et al. 2015

High-Power Diode Laser Technology and Applications XIII

View full text Add to dashboard Cite

show abstract

“…We have optimized laser diodes in the 1060 nm wavelength range for improved chip and fiber coupling efficiency, output power and linearity in pulsed operation utilizing the design rules recently reported for 980 nm pump lasers [3] . Processed as spatial single mode lasers using a ridge waveguide process those devices are capable to deliver in excess of 3 W ex facet output power in CW mode and 1.8 W when fiber coupled, reaching the 1 W level at 1.35 A.…”

Section: Seed Laser At 1060 Nmmentioning

confidence: 99%

Recent Progress in Semiconductor Laser for Fiber Laser Applications

Pawlik¹,

Todt²,

Moser³

et al. 2014

2014 International Semiconductor Laser Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the fast axis, the divergence is very large because of the small modal size perpendicular to the active layers. Plenty of designs were reported to reduce the vertical far-field angle such as the asymmetric waveguide [10], the large optical cavity (LOC) structure [11], [12], the passive far-field reduction layer [13], the longitudinal PBC waveguide [14] and the plasmonic collimators [15]. Vertical divergence of less than 10°at full-width at half-maximum (FWHM) has been reported by the LOC [16] and longitudinal PBC design [17], with powers over 1 W in CW mode.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Laser Diodes Based on the Longitudinal Photonic Band Crystal Concept for High Power and Narrow Vertical Divergence

Liu

et al. 2015

IEEE J. Select. Topics Quantum Electron.

View full text Add to dashboard Cite

High-power low-vertical-divergence laser diodes based on the longitudinal photonic band crystal (PBC) concept are investigated at a wavelength of 900 nm. The thicknesses of the layers in the longitudinal PBC waveguide are prudently optimized by mode analysis, and the lowest vertical far-field angle is found to be achieved by mode coupling. A self-consistent model is also utilized to study the device performances in detail, which shows excellent optical properties without obvious electronic performance degradation. In the experiment, continuous wave power up to 1 W/facet and vertical far-field angles of less than 10°(fullwidth at half-maximum) and ß50°(with 95% power content) are achieved simultaneously, with epitaxial wafer containing PBC layers of ten periods. The agreement among the design, simulation, and experiment shows a bright prospect for further reduced vertical divergence angle with high power output.Index Terms-Laser beam, laser diodes, quantum well lasers, beam divergence.

show abstract

Optimization of fiber coupling in ultra-high power pump modules at λ = 980 nm

Cited by 13 publications

References 0 publications

Development of high-power diode lasers with beam parameter product below 2 mm×mrad within the BRIDLE project

Development of high-power diode lasers with beam parameter product below 2 mm×mrad within the BRIDLE project

Recent Progress in Semiconductor Laser for Fiber Laser Applications

Design and Analysis of Laser Diodes Based on the Longitudinal Photonic Band Crystal Concept for High Power and Narrow Vertical Divergence

Contact Info

Product

Resources

About