Filament formation in a tapered GaAlAs optical amplifier

Goldberg, L.; Surette, Marc R.; Mehuys, D.

doi:10.1063/1.109399

Cited by 49 publications

(10 citation statements)

References 11 publications

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“…2 However, filamentation in the broad-area flared amplifier reduces the potential efficiency of the device. [3][4][5][6][7][8][9] Recent efforts by Botez et al 10 produced a device that incorporated the advantages of the flared amplifier design with lateral mode control of the antiguided laser. 11,12 The result, an antiguided flared amplifier, can produce power comparable to that of the flared amplifier, yet is less prone to the filamentation that can affect broad area devices.…”

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confidence: 98%

“…However, several studies of tapered amplifiers have shown that noise either present on the input field or present in the amplifier can induce filamentation in the cw output of the amplifier. 6,9 In the case of amplitude fluctuations, nonuniformities in the input field can lead to uneven saturation of the gain and promote lateral mode instabilities. 6,7 Furthermore, noise within the amplifier can couple to the injected field through carrier induced antiguiding.…”

mentioning

confidence: 99%

“…6,9 In the case of amplitude fluctuations, nonuniformities in the input field can lead to uneven saturation of the gain and promote lateral mode instabilities. 6,7 Furthermore, noise within the amplifier can couple to the injected field through carrier induced antiguiding. 9 The result is amplitude fluctuations that are further accentuated by the nonuniform saturation of the gain.…”

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confidence: 99%

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Operation and stability of antiguided flared amplifiers

Ramanujan

Winful

1996

Applied Physics Letters

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confidence: 98%

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confidence: 99%

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confidence: 99%

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Operation and stability of antiguided flared amplifiers

Ramanujan

Winful

1996

Applied Physics Letters

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“…Thus it is anticipated that semiconductor spatial solitons will have the potential for implementing beam steering, routing, and optical processing in optical communications at practical power levels (mW) with fast response times (ps). Suppression of filament formation, which is a serious problem in broad area semiconductor devices as a result of carrier-induced refractive index changes [8][9][10], is another potential field of application for this new kind of dissipative solitons. Although there were some preliminary self-trapping experiments in SOAs [11], which have subsequently been proven to be unstable systems for soliton generation [12], to the best of our knowledge spatial solitons in semiconductor amplifiers have not been previously reported.…”

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confidence: 99%

Stable Dissipative Solitons in Semiconductor Optical Amplifiers

et al. 2003

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“…Large-aperture ͑у100 m͒ devices such as the fanouttype master-oscillator power amplifier ͑MOPA͒ 1 and the ␣-distributed-feedback ͑DFB͒ laser 2 have displayed high diffraction-limited, single-frequency powers. However, such devices, having weak or no lateral-mode confinement, possess inherent instabilities, [3][4][5][6] thus raising serious issues of long-term stability and reliability. Therefore, there is a need for coherent large-aperture devices which not only select fundamental-mode operation but also maintain a stable mode to high drive levels.…”

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confidence: 99%

0.45 W diffraction-limited beam and single-frequency operation from antiguided phase-locked laser array with distributed feedback grating

Nesnidal

Earles

Mawst

et al. 1998

Applied Physics Letters

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A second-order diffraction grating placed below the active region of a phase-locked resonant antiguided array selects the in-phase array mode in addition to its role as a single-longitudinal-mode selector. This type of array-mode discrimination relies on the fact that the resonant in-phase array mode has significantly better field overlap with the grating region than nonresonant array modes. Furthermore, it eliminates the need for a conventional array-mode discriminator: interelement loss; which can cause self-pulsations. Diffraction-limited beam and single-frequency operation is obtained to at least 0.45 W peak pulsed power from 20 element, InGaAs/InGaP/GaAs structures (ϭ0.97 m) of 120-m-wide aperture. Distributed-feedback operation is confirmed over the 20-40°C temperature range. The results are in good agreement with theory. © 1998 American Institute of Physics. ͓S0003-6951͑98͒02531-5͔The ability to produce high-power, single-frequency, single-spatial-mode light sources is of fundamental importance to applications such as coherent free-space optical communications, blue-light generation via frequency doubling, midinfrared light generation via parametric frequency conversion, and low-noise sources for high-fidelity rf optical links. Large-aperture ͑у100 m͒ devices such as the fanouttype master-oscillator power amplifier ͑MOPA͒ 1 and the ␣-distributed-feedback ͑DFB͒ laser 2 have displayed high diffraction-limited, single-frequency powers. However, such devices, having weak or no lateral-mode confinement, possess inherent instabilities, 3-6 thus raising serious issues of long-term stability and reliability. Therefore, there is a need for coherent large-aperture devices which not only select fundamental-mode operation but also maintain a stable mode to high drive levels.As in the case of single-element devices, large-aperture emitters can achieve lateral-mode stability only by introducing strong built-in index guiding (⌬nу0.01). Resonant antiguided diode laser arrays ͑ROW arrays͒ 7 with 100-200-m-wide apertures have demonstrated the ability to operate in-phase with stable, diffraction-limited or near-diffractionlimited beams to record-high pulsed and cw output powers.7-10 Such performances are due primarily to the devices' high effective-index step (⌬n eff ϳ0.05) and inherent stability against multimoding via gain spatial hole burning ͑GSHB͒.11 Discrimination against higher order spatial modes is usually provided by placing loss in the high effectiveindex interelement regions, 7 in turn suppressing modes with significant interelement field. However, it has been shown 12 that the presence of interelement loss could trigger selfpulsations due to saturable absorption at high power levels. Therefore, in order to assure stable, coherent high powers from antiguided arrays, there is a need for a novel spatialmode selector that does not rely on interelement loss.Here we present the first experimental proof of the concept 13 that a DFB grating placed below the active region of a ROW array selects both a single longitudina...

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Filament formation in a tapered GaAlAs optical amplifier

Cited by 49 publications

References 11 publications

Operation and stability of antiguided flared amplifiers

Operation and stability of antiguided flared amplifiers

Stable Dissipative Solitons in Semiconductor Optical Amplifiers

0.45 W diffraction-limited beam and single-frequency operation from antiguided phase-locked laser array with distributed feedback grating

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