Modal Behavior, Spatial Coherence, and Beam Quality of a High-Power Gain-Guided Laser Array

Spreemann, Martin; Eppich, B.; Schnieder, Frank; Wenzel, H.; Erbert, G.

doi:10.1109/jqe.2010.2055044

Cited by 17 publications

(12 citation statements)

References 18 publications

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“…This value is significantly lower than for typical QW laser material [7], which usually exhibit dλ/dT values between 03.−0.4 nm/K. However, it is more than two times higher than the lowest reported value [4].…”

Section: Device Characterizationcontrasting

confidence: 55%

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15-W Fiber-Coupled Quantum-Dot Pump Module

Gilfert

Pavelescu

Reithmaier

et al. 2012

IEEE Photon. Technol. Lett.

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We have developed 920-nm pump modules for Yb-doped fiber amplifiers. The pump laser utilizes a single layer of In(AlGa)As/GaAs quantum-dot material as active region. Stable operation without thermoelectric cooling, output powers of up to 40 W, and wall-plug efficiencies of more than 50% have been achieved on processed broad-area laser bars. The packaged module reaches 15 W when coupled to a 200-µm fiber.Index Terms-Optical fiber amplifiers, optical fiber communication, quantum dots, semiconductor lasers.

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Section: Device Characterizationcontrasting

confidence: 55%

“…A total output power of 38 W at 50 A (limited by the power supply) was achieved. This is comparable to high power lasers based on quantum well material [7]. The high slope efficiency of the BA lasers is maintained on the bar level.…”

Section: Device Characterizationmentioning

confidence: 59%

15-W Fiber-Coupled Quantum-Dot Pump Module

Gilfert

Pavelescu

Reithmaier

et al. 2012

IEEE Photon. Technol. Lett.

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“…Detailed investigation of the beam characteristics of gain-guided arrays has been reported in Refs. [13,14].…”

Section: Lateral Beam Characteristicmentioning

confidence: 99%

stripe lasers for high-power fiber coupled pump modules

Platz

Erbert

Pittroff

et al. 2013

High Pow Laser Sci Eng

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We present a 940 nm quasi-continuous wave semiconductor laser designed as a building block for high-power fiber coupled pump modules. The laser comprises a 400 µm narrow-stripe array mounted on an aluminum nitride substrate using hard solder. The chip has been optimized for high optical power and low lateral far-field angles. Two vertical and six lateral structure variations have been investigated to determine the best achievable performance. Operating at 1 ms pulse width and a repetition rate of 10 Hz, the laser device reaches a maximum pulse power of 86 W from a 400 µm aperture and more than 62% maximum conversion efficiency. Low lateral far-field angles (95% power enclosed) of 11.5 • and 13.5 • , depending on the epitaxial design, enable efficient multimode fiber coupling. The potential for highly reliable applications has been demonstrated.

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“…The resultant temperature rise differs at different waveguides of the laser arrays, larger at the centre and smaller on both sides. This non-uniform rise induces a modulation of the refractive index of the waveguides, which acts as an integrated thermal lens [19], focusing the near-field distribution and broadening the main lobe of the far-field profile. For simplification, we simulate this effect by assuming a linearly graded refractive index profile from the centre to both sides in the phase-shift region and output region, as shown in figure 6(a).…”

Section: Simulation Resultsmentioning

confidence: 99%

Comprehensive design and analysis of diode laser arrays with an integrated phase shifter

Liu¹,

Qu²,

Wang³

et al. 2013

J. Phys. D: Appl. Phys.

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Diode laser arrays integrated with a phase shifter are investigated systematically based on the beam propagation method. Device parameters have been varied to obtain expected mode conversion. The passive waveguide loss and two main factors accounting for varied far-field profiles at different driving conditions are analysed. We demonstrate that on-axis main-lobe emission can be maintained by reducing the phase-shifter length within a certain scope. The far-field angle under the thermal lensing effect is theoretically proved to be nearly diffraction-limited by two-step etching. These optimizations are promising for on-axis nearly diffraction-limited laser emission with a higher output power.

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Modal Behavior, Spatial Coherence, and Beam Quality of a High-Power Gain-Guided Laser Array

Cited by 17 publications

References 18 publications

15-W Fiber-Coupled Quantum-Dot Pump Module

15-W Fiber-Coupled Quantum-Dot Pump Module

stripe lasers for high-power fiber coupled pump modules

Comprehensive design and analysis of diode laser arrays with an integrated phase shifter

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