Generation of 7W nanosecond pulses with 670nm ridge-waveguide lasers

Klehr, A.; Prziwarka, Thomas; Liero, A.; Hoffmann, Th.; Pohl, J.; Fricke, J.; Wünsche, H.‐J.; Wenzel, H.; Heinrich, W.; Erbert, G.

doi:10.1117/12.2208333

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…However, diode lasers compete with other lasers such as solid state and fibre lasers regarding pulse energy and peak power. Therefore, during the last years experimental and theoretical efforts have been undertaken by several groups to improve the performance of pulsed diode lasers in the red and near-infrared spectral region [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies of the generation of picoseconds pulses with two-section blue-violet semiconductor lasers

Tronciu¹,

Wenzel²,

Knigge³

2020

Semicond. Sci. Technol.

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We report the results of theoretical investigations of the generation of sub-10ps pulses by a blueviolet InGaN two-section laser. The principle of pulse generation is active Q-switching. We study numerically the influence of the length of the switching section and the emission wavelength on the steady-state and dynamic behaviour. We investigate also the impact of the gain-compression factor on peak power, pulse energy and pulse width and compare the numerical results with semi-analytic expressions.

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Section: Introductionmentioning

confidence: 99%

Theoretical studies of the generation of picoseconds pulses with two-section blue-violet semiconductor lasers

Tronciu¹,

Wenzel²,

Knigge³

2020

Semicond. Sci. Technol.

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“…Optical pulses with diffraction-limited emission can be generated by lasers having a small aperture, such as ridge waveguide (RW) lasers. In [7] we reported the generation of 200 ps-1.2 ns long optical pulses with a peak power of 7 W and presented results of time-dependent one-dimensional simulations. The RW lasers used emitted around 670 nm and had a ridge width of 15 μm.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this paper is an experimental and theoretical study of the generation of 2 ns long pulses by RW lasers with a ridge width of 4.4 μm emitting at a wavelength of 808 nm. Primarily results have been already presented in [8]. We compare the performance of a more conventional structure with an extreme double asymmetric large optical cavity design.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical characteristics of 808 nm ridge-waveguide lasers operated with high-current nanosecond pulses

Klehr

Wünsche

Liero

et al. 2017

Semicond. Sci. Technol.

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The aim of this paper is to present detailed experimental and theoretical investigations of the behavior of ridge-waveguide (RW) lasers emitting at 808 nm under injection of 3 ns long current pulses with amplitudes higher than 10 A. The RW lasers are based on tensile-strained GaAsP quantum wells embedded in asymmetric and extremely asymmetric AlGaAs based waveguide structures, which differ mainly in the ratio between the thicknesses of the p-and n-type confinement layers. The width of the ridges is 4.4 μm and the length of the cavities is 3.9 mm. The laser diodes are mounted on an in-house developed high-frequency unit electrically driven by nearly rectangular shaped current pulses with a length of 3 ns and a repetition frequency of 1 MHz. At a pulse current of 15 A maximum pulse powers of 4.0 and 5.4 W are reached for the asymmetric and extremely asymmetric structures, respectively. After turning off the bias a pronounced negative current superimposed by current oscillations caused by the external circuitry appears. Two-dimensional simulations based on a solution of the time-dependent drift-diffusion, waveguide and power-balance equations reveal that a part of the carriers injected into the laser diode does not recombine in the active region and accumulates under the ridge in the bulk layers and beyond the ridge in the active layer. At the end of the electrical pulse the electrons flow back and generate a reverse (negative) current. The simulation exaggerates the achievable output power, in particular for the extremely asymmetric structure. Further theoretical studies are needed to resolve this discrepancy.

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Generation of 7W nanosecond pulses with 670nm ridge-waveguide lasers

Cited by 2 publications

References 6 publications

Theoretical studies of the generation of picoseconds pulses with two-section blue-violet semiconductor lasers

Theoretical studies of the generation of picoseconds pulses with two-section blue-violet semiconductor lasers

Electro-optical characteristics of 808 nm ridge-waveguide lasers operated with high-current nanosecond pulses

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