Compensation of pulse-distortion in saturated laser amplifiers

Schimpf, Damian N.; Ruchert, Clemens; Nodop, D.; Limpert, Jens; Tünnermann, Andreas; Salin, F.

doi:10.1364/oe.16.017637

Cited by 104 publications

(56 citation statements)

References 7 publications

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“…As expected, the amplitude modulation applied on the AOM driving signal has to be pre-compensated in order to obtain a suitable waveform amplitude function µ(t), because of EDFA-related phenomena [21]. In order to avoid having to retune this pre-compensation as we switch from one waveform type to another, pulse-pair mode is implemented by simply taking the first two pulses of 6-pulse waveforms.…”

Section: Apparatusmentioning

confidence: 99%

Advanced signal processing methods for pulsed laser vibrometry

Totems¹,

Jolivet²,

Ovarlez³

et al. 2010

Appl. Opt.

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Although pulsed coherent laser radar vibrometry has been introduced as an improvement over its Continuous Wave (CW) counterpart, it remains very sensitive to decorrelation noises such as speckle, and other disturbances of the measurement. Taking advantage of more polyvalent poly-pulse waveforms, we address the issue with advanced signal processing. We have conducted what we believe is the first extensive comparison of processing techniques considering CW, pulse-pair and poly-pulse emissions. In this framework, we introduce a computationally efficient maximum likelihood estimator and test signal tracking on pseudo time-frequency representations, which respectively help deal with speckle noise and fading of the signal, in harsh noise conditions. Our comparison on simulated signals is validated on a 1.55µm all-fiber vibrometer experiment, with an apparatus simulating vibration and strong speckle noise. Results show the advantage of estimators taking into account actual noise statistics, and call for a wider use of timefrequency representations to track the vibration modulated signal. OCIS codes: 280.0280, 280.3340, 120.7280. 2

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Section: Apparatusmentioning

confidence: 99%

Advanced signal processing methods for pulsed laser vibrometry

Totems¹,

Jolivet²,

Ovarlez³

et al. 2010

Appl. Opt.

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“…In all experiments the pulse duration is set to 100 ns, which is two times longer than reported previously in Ref. [12]. The repetition frequency was set to 100 kHz.…”

Section: Resultsmentioning

confidence: 99%

“…In such a system, when the amplifier energy reaches the saturation level the output pulse will be distorted. The leading edge of the pulse will get a high gain depleting the population inversion, so the rest of the pulse will be decreased exponentially [11,12]. It is possible to compensate the disadvantageous influence of energy saturation by properly shaping the input pulse.…”

Section: Introductionmentioning

confidence: 99%

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Pulsed dual-stage fiber MOPA source operating at 1550 nm with arbitrarily shaped output pulses

et al. 2011

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In this paper we present an effective method of pulse distortion pre-compensation in saturated high-power fiber amplifiers by arbitrarily shaping the input pulse. We derive a simple expression which allows us to generate userdefined pulse shapes at the output of the amplifier chain consisting of more than one stage. The numerical results were verified experimentally using a diode-seeded all-fiber two-stage master oscillator-power amplifier (MOPA) source based on Er 3+ /Yb 3+ -doped double-clad fiber. Several examples of obtained output shapes are presented, including high-energy 100-ns-long rectangular pulses.

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“…(High energy square pulses are readily obtainable from ytterbium amplifiers by means of pre-shaping the seed pulses [18,19]). For the 70 ns pulse (or pulse burst) considered here, and 23 dB gain in the amplifier so the output pulse energy is 1.5 mJ, and for a flat-top output pulse, the Raman threshold output pulse energy would be 1.5 mJ using Smith's paper as an estimate [20], and the B-integral would be ~30 radians.…”

Section: Simulationsmentioning

confidence: 99%

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

Malinowski

Price

Zervas³

2015

IEEE J. Quantum Electron.

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Abstract-We propose a new tandem pumping scheme in threelevel rare-earth doped optical fibers where energy storage in a pump fiber laser enables much shorter (~500 ns) pump pulses than is possible with pulsed diode laser pumping. This has the effect of reducing the time during which the final amplifier has high inversion and hence reduces the ASE when compared to continuous wave (c.w.) tandem pumping. We simulate the gain and ASE dynamics in a pulse-pumped Yb-doped fiber amplifier and show that the ratio of amplified signal to ASE background can be improved by up to 2 orders of magnitude over a large range of pulse energies compared to c.w. tandem pumping. Sub-microsecond pulsed tandem pumping offers a relatively straightforward, as yet experimentally untried, way to substantially reduce undesirable ASE compared to the levels in diode-pumped fiber amplifiers.

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Compensation of pulse-distortion in saturated laser amplifiers

Cited by 104 publications

References 7 publications

Advanced signal processing methods for pulsed laser vibrometry

Advanced signal processing methods for pulsed laser vibrometry

Pulsed dual-stage fiber MOPA source operating at 1550 nm with arbitrarily shaped output pulses

Sub-Microsecond Pulsed Pumping as a Means of Suppressing Amplified Spontaneous Emission in Tandem Pumped Fiber Amplifiers

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