Experimental determination of the thermal lens parameters in a broad area semiconductor laser amplifier

Bawamia, Ahmad; Eppich, B.; Paschke, K.; Wenzel, H.; Schnieder, Frank; Erbert, G.; Tränkle, G.

doi:10.1007/s00340-009-3591-z

Cited by 22 publications

(21 citation statements)

References 13 publications

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“…The optimal separation increased monotonically over the range of currents investigated, reaching a maximum of 8 mm at 11 A and 1.62 W output power. The behavior suggests the formation of a thermal lens within the BAL emitters [21] and increased overlap of higher order modes with the gain profile within the emitters relative to overlap of the fundamental mode. An output spectrum from the mode-imaging WBC cavity is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fast-to-slow axis mode imaging for brightness enhancement of a broad-area laser diode array

Jones

Gopinath

2013

Opt. Express

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Broad-area laser (BAL) diodes have found use in numerous applications requiring multi-watt powers, but remain limited by poor spatial beam quality. A novel laser cavity that enhances the brightness of a BAL array has been demonstrated. Wavelength beam combining (WBC) is used to spatially overlap output from the emitters. Improved beam quality is achieved by imaging the fast-axis mode onto the slow axis of the BAL array. The brightness is enhanced twofold over a typical Littman-Metcalf WBC cavity, reaching 47 MW·cm(-2)·sr(-1) at an output power of 1.16 W.

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Section: Resultsmentioning

confidence: 99%

Fast-to-slow axis mode imaging for brightness enhancement of a broad-area laser diode array

Jones

Gopinath

2013

Opt. Express

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“…The change of index with temperature dn/dT = 2.5 × 10 −4 [3] is assumed to be temperature independent and spatially constant. Figs.…”

Section: Theoretical Model and Numerical Resultsmentioning

confidence: 99%

Theoretical and experimental analysis of the lateral modes of high-power broad-area lasers

Wenzel

Crump

Ekhteraei

et al. 2011

2011 Numerical Simulation of Optoelectronic Devices

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For maximum fiber-coupled power, broad-area (BA) diode lasers must operate with small lateral far field angles. However, these structures are laterally multi-moded, with low beam quality and wide emission angles. We use a combination of device simulation and diagnostic measurements to determine the physical factors limiting the lateral far field angle in state of the art BA lasers emitting at 975 nm. Two-dimensional simulations of the optical field enable the dominant lateral waveguiding mechanisms to be diagnosed. Spectrally resolved near and far field measurements will allow us to determine the nature of the lateral modes.

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“…To mimic a heating-induced red-shift of the lasing wavelengths and a corresponding broadening of the far-fields, we assume additional linear bias current I-dependent contributions to the gain peak wavelength and the excess refractive index, δ h n = (c h n + L h n (x))I [4]. The heating-induced lateral profile L h n (x) within the emitter can be approximated by a negative parabola [7] or, even better, by a suitable Lorentzian or supergaussian, but, in general, should be estimated experimentally or precomputed using the heat transport model defined within the transversal cross-section of the BAL [8]. The amplitude of L t n in our case was about 10 −4 A −1 .…”

Section: Dynamical Model Of Broad-area Lasermentioning

confidence: 99%

“…One of the reasons causing the reduction of efficiency, in this case, is an increased filtering spectral band dependence on the lateral position x at the front facet of BALs. Namely, according to(7), the central filtering wavelengths λ s and λ c are depending on x:…”

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Beam-combining scheme of high-power broad-area semiconductor lasers with Lyot-filtered reinjection: modeling, simulations, and experiments

Brée

Raab²,

Montiel-Ponsoda

et al. 2019

J. Opt. Soc. Am. B

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A brightness-and power-scalable polarization beam combining scheme for high-power, broadarea semiconductor laser diodes is investigated numerically and experimentally. To achieve the beam combining, we employ Lyot-filtered optical reinjection from an external cavity, which forces lasing of the individual diodes on interleaved frequency combs with overlapping envelopes and enables a high optical coupling efficiency. Unlike conventional spectral beam combining schemes with diffraction gratings, the optical coupling efficiency is insensitive to thermal drifts of laser wavelengths. This scheme can be used for efficient coupling of a large number of laser diodes and paves the way towards using broad-area laser diode arrays for cost-efficient material processing, which requires high-brilliance emission and optical powers in the kW-regime.

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Experimental determination of the thermal lens parameters in a broad area semiconductor laser amplifier

Cited by 22 publications

References 13 publications

Fast-to-slow axis mode imaging for brightness enhancement of a broad-area laser diode array

Fast-to-slow axis mode imaging for brightness enhancement of a broad-area laser diode array

Theoretical and experimental analysis of the lateral modes of high-power broad-area lasers

Beam-combining scheme of high-power broad-area semiconductor lasers with Lyot-filtered reinjection: modeling, simulations, and experiments

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