Mode shaping in semiconductor broad area lasers by monolithically integrated phase structures

Eckstein, Hans-Christoph; Zeitner, Uwe D.; Tünnermann, Andreas; Schmid, W.; Strauß, Uwe; Lauer, Christian

doi:10.1364/ol.38.004480

Cited by 20 publications

(5 citation statements)

References 7 publications

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“…This technique was recently published in [12,13]. In these publications we show that it is possible to increase the beam quality with waveguide phase structures and aperture grooves in the waveguide.…”

Section: Chip Design Under Consideration Of Thermal Effectsmentioning

confidence: 92%

Numerical simulation and optimization of microstructured high brightness broad area laser diodes

Eckstein

Zeitner

Tünnermann

et al. 2015

Novel in-Plane Semiconductor Lasers XIV

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The development of broad area laser diodes towards higher output power, efficiency and brightness is essential to gain progress in almost all laser applications because those devices provide the basis for high power laser sources. To systematically improve the characteristics of high power broad area laser diodes through a design process, it is necessary to have an accurate and efficient computation model self-consistently taking into account optical, electrical and thermal properties. In this publication we present numerical techniques to compute the optical properties of the multimode beam generated by high power AlGaAs broad area laser diodes with an operating wavelength of 970 nm. This simulation considers fluctuations of the carrier and power density as well as the temperature distribution. The numerical results show an excellent agreement to measured data of conventional and microstructured high power broad area lasers. The high computation speed of the model allows optimizing microstructures inside the laser resonator with the use of a genetic optimization algorithm. We show that this design approach potentially leads to a substantial performance gain of the device. In particular degradation of the beam quality due to thermal effects at high injection currents can be controlled

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Section: Chip Design Under Consideration Of Thermal Effectsmentioning

confidence: 92%

Numerical simulation and optimization of microstructured high brightness broad area laser diodes

Eckstein

Zeitner

Tünnermann

et al. 2015

Novel in-Plane Semiconductor Lasers XIV

Self Cite

View full text Add to dashboard Cite

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“…One method of filtering out the high-order modes is to tailor the gain or loss profile of the BA lasers [6], [7], [8], which can increase the gain of the fundamental mode or increase the loss of the high-order modes. Proper optical feedback along the longitudinal direction of the cavity can also reduce the number of the high-order modes, and enhance the oscillation of the fundamental mode [9], [10], [11]. Besides, lateral coupling structures can be adopted to couple the high-order modes, and decrease their optical confinement factor in the region injected with currents, filtering out the high-order modes as well [12], [13], [14], [15], [16], [17], [18], [19].…”

Section: Introductionmentioning

confidence: 99%

Transverse Photonic Crystal Mode Engineering for Broad-Area Semiconductor Lasers With Narrow-Divergence Angles

Wang

Zhou

et al. 2023

IEEE Photonics J.

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Broad-area semiconductor lasers, coupled with asymmetric transverse photonic crystals (TPCs), are designed by the effective index method and the transfer matrix method. Due to the propagation constant of the fundamental mode lying in the forbidden band of the TPCs, but those of the high-order modes lying in the allowed band of the TPCs, the fundamental mode is mainly concentrated in the active ridge waveguide, while all the high-order modes extend into the lossy TPCs on both sides of the active ridge waveguide. Therefore, the fundamental mode possesses larger optical confinement factor than those of the high-order modes, and reaches the lasing threshold more easily, which is demonstrated by the single-lobe horizontal far-field pattern of the TPC broad-area laser under an injection current of 0.3 A near the threshold. The proposed TPC broad-area laser provides a new strategy of designing broad-area semiconductor lasers with narrow divergence angles.

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“…Introducing mode filters is another effective approach for inducing additional losses specifically targeting high-order modes. Examples of such mode filters include tapered lasers, phase structures, external cavity configurations, tilted waveguides, microstructures, and inhomogeneous waveguides [14], [15], [16], [17], [18], [19], [20], [21]. However, these methods are subject to limitations, as they often come at the cost of decreased output power or require complex designs, which restrict their practical applicability.…”

Section: Introductionmentioning

confidence: 99%

Improved Far-Field Angle in Narrow-Ridge High-Power Laser Diodes Using a Double Stripe Structure

Kim,

Yang,

Choi

et al. 2023

IEEE Photonics J.

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We propose a novel double stripe structure for achieving a narrow far-field angle without significant output power loss in narrow-ridge high-power broad-area laser diodes. By introducing double SiO2 stripes on the top side of the laser diode, we effectively suppress high-order modes through mode weight engineering. Through self-consistent electro-thermaloptical simulations powered by LASTIP with the well-verified model from the reference, we comprehensively analyze and compare the characteristics of high-power broad-area laser diodes utilizing the loss tailoring technique that adopted the much simpler structure compared to prior study and our proposed structure. Our results demonstrate a significant reduction of approximately 36% in the far-field angle while maintaining slope efficiency. This approach shows promise for enhancing the performance of coupling efficiency between narrow-ridge highpower laser diodes and fibers.

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Mode shaping in semiconductor broad area lasers by monolithically integrated phase structures

Cited by 20 publications

References 7 publications

Numerical simulation and optimization of microstructured high brightness broad area laser diodes

Numerical simulation and optimization of microstructured high brightness broad area laser diodes

Transverse Photonic Crystal Mode Engineering for Broad-Area Semiconductor Lasers With Narrow-Divergence Angles

Improved Far-Field Angle in Narrow-Ridge High-Power Laser Diodes Using a Double Stripe Structure

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