Advances in performance and beam quality of 9xx-nm laser diodes tailored for efficient fiber coupling

Lauer, Christian; König, Harald; Grönninger, Günther; Hein, S.; Gomez‐Iglesias, Alvaro; Furitsch, M.; Marić, Josip; Kissel, H.; Wolf, P.; Biesenbach, Jens; Strauß, Uwe

doi:10.1117/12.908421

Cited by 19 publications

(11 citation statements)

References 5 publications

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“…A common figure of merit for high power lasers is the so-called linear brightness, which is defined as lasing power divided by the half-width of the near field and the halfwidth of the far field [11]. In our case, the slow axis linear brightness at 2A rises by 55% from 0.9 to 1.4 W/mm*mrad after implementation of the air gap.…”

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confidence: 77%

Inverse Thermal Lens Effects on the Far-Field Blooming of Broad Area Laser Diodes

Piprek¹

2013

IEEE Photon. Technol. Lett.

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Abstract-High-power broad-area laser diodes often suffer from a widening of the lateral far-field with increasing current (slow-axis far-field blooming). This effect mainly originates in self-heating that generates a lateral thermal lens in the active region. Pedestal heat sinking was recently shown to mitigate the far-field blooming. In this letter, utilizing self-consistent electro-thermal optical simulations, we analyze such a far-field improvement and link it to the formation of an inverse thermal lens. At high injection current, the inverse thermal lens is shown to weaken high-order lateral modes and to even narrow the slow-axis far-field.

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confidence: 77%

Inverse Thermal Lens Effects on the Far-Field Blooming of Broad Area Laser Diodes

Piprek¹

2013

IEEE Photon. Technol. Lett.

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“…Modern BALDs with 100µm stripe-width are capable of achieving ~20W CW operation [16], [17]. These LDs are multimode along their slow axis direction and Gaussian-like single mode along their fast axis which is perpendicular to the p-n junction plane.…”

Section: Two-photon Absorption Coefficientmentioning

confidence: 99%

Two photon absorption in high power broad area laser diodes

et al. 2014

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Recent advances in thermal management and improvements in fabrication and facet passivation enabled extracting unprecedented optical powers from laser diodes (LDs). However, even in the absence of thermal roll-over or catastrophic optical damage (COD), the maximum achievable power is limited by optical non-linear effects. Due to its non-linear nature, two-photon absorption (TPA) becomes one of the dominant factors that limit efficient extraction of laser power from LDs. In this paper, theoretical and experimental analysis of TPA in high-power broad area laser diodes (BALD) is presented. A phenomenological optical extraction model that incorporates TPA explains the reduction in optical extraction efficiency at high intensities in BALD bars with 100µm-wide emitters. The model includes two contributions associated with TPA: the straightforward absorption of laser photons and the subsequent single photon absorption by the holes and electrons generated by the TPA process. TPA is a fundamental limitation since it is inherent to the LD semiconductor material. Therefore scaling the LDs to high power requires designs that reduce the optical intensity by increasing the mode size.

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“…At high powers the increase in threshold current and droop in differential efficiency became big factors in lowering laser wall-plug efficiency. In diode pumped fiber lasers where high fiber coupling efficiency is required, the biggest obstacles to higher power scaling was the rise in the slow axis divergence due to internal heating [4] which limited the number of LDs that could be coupled into a fiber. To maintain good laser performance in future systems, new cooling concepts need to be explored.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and simulation of laser diode diamond microcoolers

Matin

Zheng

Bar‐Cohen

2014

Fourteenth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

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High heat flux management schemes in laser diodes require appropriate cooling applications. Micro channel coolers are now widely used in high power laser diode industry with the highest total thermal resistance reported as low as 0.03 cm 2 -K/W with pressure drops as low as 10~50 psi. Since, the geometries, flow rates as well as high heat fluxes of current SOA LD micro-coolers differ, it is necessary to understand their thermal performance relative to conductive, convective and caloric thermal resistance. To do this comparison an equivalent effective micro-cooler thermal model is developed and then iterated with scaled input parameters from SOA LD micro-coolers. The objective is to identify the dominant thermal resistance -that plays the major role in decreasing the total thermal resistance. This paper will then predict a micro cooler that will perhaps be able to reduce total thermal resistance lower than 0.01 Kcm 2 /W with minimal pressure drop for next generation high heat flux applications. The current study will be restricted to only single phase liquid cooling.

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Advances in performance and beam quality of 9xx-nm laser diodes tailored for efficient fiber coupling

Cited by 19 publications

References 5 publications

Inverse Thermal Lens Effects on the Far-Field Blooming of Broad Area Laser Diodes

Inverse Thermal Lens Effects on the Far-Field Blooming of Broad Area Laser Diodes

Two photon absorption in high power broad area laser diodes

Numerical modeling and simulation of laser diode diamond microcoolers

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